Force & Motion Quiz For 8th Grade

Reviewed by Matt Balanda
Matt Balanda, BS (Aerospace Engineering) |
Science Teacher
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Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.
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  • 1/35 Questions

    A force is a push or a pull

    • True
    • False
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About This Quiz

Are you in 8th grade? Do you know Force, Inertia, Gravity, Acceleration, Velocity, and Speed very well? If your answer is yes, then this Force & Motion Quiz is made for you. This informative quiz contains a wide range of questions that will put your conceptual learnings to the test. Challenge yourself and see how many answers you can give. If you like this quiz and learned something new from it, share it with your friends.

Force & Motion Quiz For 8th Grade - Quiz

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  • 2. 

    Which of the following statements about inertia is NOT true?

    • Inertia is the tendency of an object to resist changes in its motion. 

    • Objects with greater mass have greater inertia. 

    • Inertia is a force that keeps objects moving in a straight line.

    • Inertia can be overcome by applying a force.

    Correct Answer
    A. Inertia is a force that keeps objects moving in a straight line.
    Explanation
    Inertia is not a force itself; it's a property of matter. It describes an object's resistance to changes in its state of motion. While it's true that inertia causes objects to continue moving in a straight line at a constant speed unless acted upon by a force (Newton's first law), inertia itself doesn't "keep" them moving. It simply describes their tendency to maintain their current state of motion.

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  • 3. 

    The location of an object is __________.

    • Motion

    • Speed

    • Position

    • Size

    Correct Answer
    A. Position
    Explanation
    The location of an object refers to its position in space. It describes where the object is located relative to a reference point or coordinate system. Therefore, the correct answer is "position".

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  • 4. 

    What is motion?

    • When an object changes position relative to a reference point.

    • When something is still and not moving.

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. When an object changes position relative to a reference point.
    Explanation
    Motion is defined as the change in position of an object relative to a reference point. This means that when an object moves from one place to another, it is considered to be in motion. The reference point is a fixed point that helps us determine the change in position. Therefore, the correct answer is "When an object changes position relative to a reference point."

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  • 5. 

    Acceleration refers to

    • Decreasing speed, changing direction, increasing speed

    • Mass

    • Force

    • Momentum

    Correct Answer
    A. Decreasing speed, changing direction, increasing speed
    Explanation
    Acceleration refers to the rate at which an object's velocity changes over time. It can be either positive or negative, depending on whether the object is speeding up or slowing down. Therefore, acceleration can refer to both increasing speed and decreasing speed. Additionally, acceleration also involves changing direction, as an object can accelerate even if its speed remains constant, as long as its direction changes. Therefore, the correct answer is decreasing speed, changing direction, increasing speed.

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  • 6. 

    Gravity is the force of attraction between all masses.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Gravity is the force of attraction that exists between any two masses, any two bodies, any two particles. It is the force that pulls objects towards each other. This force is responsible for keeping the planets in orbit around the sun, for keeping the moon in orbit around the Earth, and for bringing objects down to the ground when they are dropped. Therefore, it is correct to say that gravity is the force of attraction between all masses.

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  • 7. 

    What is the definition of speed?

    • When an object changes position.

    • An object that stays in place.

    • Distance traveled by an object for a unit of time.

    • Running very fastly.

    Correct Answer
    A. Distance traveled by an object for a unit of time.
    Explanation
    The definition of speed is the distance traveled by an object for a unit of time. Speed is a measure of how quickly an object moves, and it is calculated by dividing the distance traveled by the time it takes to travel that distance. This definition is consistent with the scientific understanding of speed and is widely accepted in the field of physics.

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  • 8. 

    In order to determine speed, you must know

    • Time

    • Distance

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. Both A and B
    Explanation
    To determine speed, both time and distance are necessary. Time represents the duration it takes to cover a certain distance, while distance represents the length or extent of the path traveled. Without knowing either time or distance, it is impossible to calculate speed accurately. Therefore, both A (time) and B (distance) are required to determine speed.

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  • 9. 

    What is the speed of an object at rest?

    • 15 km/h

    • 0 km/h

    • 1 km/h

    • This cannot be determined without more information.

    Correct Answer
    A. 0 km/h
    Explanation
    The speed of an object at rest is 0 km/h. When an object is at rest, it is not moving and therefore has no speed. Speed is defined as the distance traveled per unit of time, and if the object is not moving, it covers no distance and has a speed of 0 km/h.

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  • 10. 

    What are possible units for acceleration?

    • Meters per second squared.

    • Meters per second

    • Feet

    • Kilometer per second squared.

    Correct Answer
    A. Meters per second squared.
    Explanation
    The possible units for acceleration are m/s/s (meters per second squared) and k/h/h (kilometers per hour squared). These units represent the change in velocity per unit of time, with m/s/s being the standard unit in the International System of Units (SI) and k/h/h being a less commonly used unit. The units meters and feet are units of length, while Newton is a unit of force and not directly related to acceleration.

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  • 11. 

    A change of position of an object is _____________

    • Position

    • Speed

    • Motion

    • Acceleration

    Correct Answer
    A. Motion
    Explanation
    Motion refers to the change in position of an object over time. It involves the movement of an object from one place to another. This can be in any direction and at any speed. Therefore, motion is the most appropriate term to describe the change of position of an object.

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  • 12. 

    What is the basic unit for distance or length?

    • Yards

    • Inches

    • Feet

    • Meters

    Correct Answer
    A. Meters
    Explanation
    The basic unit for distance or length is meters. Meters are commonly used in the metric system and are a standard unit of measurement for length. They are used in many scientific and everyday applications worldwide.

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  • 13. 

    Acceleration is 

    • Increasing speed, decreasing speed, or changing direction

    • Speed in a particular direction

    • Velocity with direction

    • None of the above

    Correct Answer
    A. Increasing speed, decreasing speed, or changing direction
    Explanation
    Acceleration is the rate at which an object's velocity changes over time. It can be caused by increasing or decreasing speed, or by changing direction. Therefore, the correct answer is that acceleration can involve increasing speed, decreasing speed, or changing direction.

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  • 14. 

    How can you increase/decrease friction?

    • Add a rough surface to increase, add lubricant to decrease.

    • Just add water.

    • Add force

    • Add acceleration

    Correct Answer
    A. Add a rough surface to increase, add lubricant to decrease.
    Explanation
    Adding a rough surface increases friction because it creates more contact points between the surfaces, resulting in greater resistance to motion. On the other hand, adding lubricant decreases friction by creating a thin layer between the surfaces, reducing the contact points and allowing for smoother movement. This explanation is based on the understanding that friction is the force that opposes motion between two surfaces in contact.

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  • 15. 

    Velocity is like speed but in (a) _________ direction.

    • Given

    • Every

    • Some

    • None of the above

    Correct Answer
    A. Given
    Explanation
    The word "given" is used to indicate that the direction of velocity is already specified or known. It implies that the direction is provided or mentioned in the context or problem statement. Therefore, the correct answer is "given".

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  • 16. 

    Unbalanced forces are 

    • When the forces of an object produce a net force not equal to zero.

    • When the forces are the same.

    • When the forces of an object produce a net force equal to zero.

    • All of the above

    Correct Answer
    A. When the forces of an object produce a net force not equal to zero.
    Explanation
    Unbalanced forces occur when the forces acting on an object do not cancel each other out and result in a net force that is greater than zero. This means that there is an overall force acting on the object, causing it to accelerate or change its motion. In contrast, balanced forces occur when the forces on an object are equal in magnitude and opposite in direction, resulting in a net force of zero. Therefore, the correct answer is when the forces of an object produce a net force larger than zero.

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  • 17. 

    What is the formula for speed?

    • Speed= Distance divided by Time

    • Speed= Time X Distance

    • D=mv

    • None of the above

    Correct Answer
    A. Speed= Distance divided by Time
    Explanation
    The formula for speed is determined by dividing the distance traveled by the time taken. This formula is derived from the basic concept that speed is the rate at which an object covers distance over a specific period of time. By dividing the distance by the time, we can calculate the average speed at which an object is moving. Therefore, the correct formula for speed is speed = distance divided by time.

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  • 18. 

    A ball is thrown vertically upwards. Which of the following is true about its acceleration at the highest point?

    • Acceleration is zero. 

    • Acceleration is upwards. 

    • Acceleration is downwards. 

    • Acceleration is horizontal.

    Correct Answer
    A. Acceleration is downwards. 
    Explanation
    Even when the ball reaches its highest point and momentarily stops before falling back down, the acceleration due to gravity is still acting upon it. Gravity always acts downwards, pulling the ball towards the Earth. This constant downward acceleration causes the ball to change its direction of motion from upwards to downwards at the highest point.

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  • 19. 

    The distance traveled by an object is divided by the time it takes to travel that distance is called

    • Average velocity.

    • Average speed.

    • Average acceleration.

    • Activity.

    Correct Answer
    A. Average speed.
    Explanation
    The distance traveled by an object divided by the time it takes to travel that distance gives the average speed. Average velocity is the displacement divided by the time, while average acceleration is the change in velocity divided by the time. "Activity" is not a relevant term in this context. Therefore, the correct answer is average speed.

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  • 20. 

    What is Newton's second law?

    • Every action has an equal and opposite reaction.

    • An object's acceleration depends on the mass of the object and the amount of force being applied.

    • An object in motion stays in motion, and an object at rest stays at rest until acted upon by an outside force.

    • None of the above

    Correct Answer
    A. An object's acceleration depends on the mass of the object and the amount of force being applied.
    Explanation
    Newton's second law states that an object's acceleration depends on the mass of the object and the amount of force being applied. This means that the greater the force applied to an object, the greater its acceleration will be. Additionally, the more massive an object is, the less it will accelerate for a given force. This law helps explain the relationship between force, mass, and acceleration, and is a fundamental principle in physics.

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  • 21. 

    What is Newton's first law?

    • Every action has an equal and opposite reaction.

    • An object's acceleration depends on the mass of the object and the amount of force being applied.

    • An object in motion stays in motion, and an object at rest stays at rest until acted upon by an outside force.

    • None of the above

    Correct Answer
    A. An object in motion stays in motion, and an object at rest stays at rest until acted upon by an outside force.
    Explanation
    Newton's first law states that an object in motion will stay in motion, and an object at rest will stay at rest, unless acted upon by an external force. This is also known as the law of inertia. It means that an object will continue its state of motion or rest until something causes it to change. This law explains why objects continue to move or stay still unless a force is applied to them, and it is the foundation for understanding the behavior of objects in the absence of external forces.

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  • 22. 

    When you are bowling, and the bowling pins, stay at rest until the bowling ball exerts a force on them by hitting them. Which Law of Motion is this an example of?

    • Newton's First Law of Motion

    • Newton's Second Law of Motion

    • Newton's Third Law of Motion

    • All of the above

    Correct Answer
    A. Newton's First Law of Motion
    Explanation
    This is an example of Newton's First Law of Motion, also known as the law of inertia. According to this law, an object at rest will stay at rest until acted upon by an external force. In this case, the bowling pins remain at rest until the bowling ball hits them and exerts a force on them.

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  • 23. 

    Three characteristics of balanced forces are

    • They don't change in motion. They are equal in size. The forces are opposite in direction.

    • Constant acceleration, speed, and velocity.

    • Causes change in motion they are not equal the move in the opposite direction.

    • All of the above

    Correct Answer
    A. They don't change in motion. They are equal in size. The forces are opposite in direction.
    Explanation
    The correct answer is "They don't change in motion. They are equal in size. The forces are opposite in direction." This answer is correct because balanced forces do not cause a change in motion, meaning that an object will continue to move at a constant velocity or remain at rest. Balanced forces are also equal in size, meaning that the magnitudes of the forces are the same. Additionally, the forces are opposite in direction, which means that they act in opposite directions on the object. These characteristics of balanced forces ensure that there is no net force acting on an object, resulting in a balanced state.

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  • 24. 

    Two ice skaters are skating. The first skater is pulling upward on the second skater while the second skater is pulling downward on the first skater. Their two forces are equal; however they are pulling each other in two opposite directions. Which Law of Motion is this an example of?

    • Newton's First Law of Motion

    • Newton's Second Law of Motion

    • Newton's Third Law of Motion

    • All of the above

    Correct Answer
    A. Newton's Third Law of Motion
    Explanation
    This scenario is an example of Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. The first skater pulling upward on the second skater creates a force, and in response, the second skater pulls downward on the first skater with an equal force. These two forces are equal in magnitude but opposite in direction, demonstrating the principle of action and reaction.

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  • 25. 

    Inertia is a property of matter.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Inertia is not a property of matter. It is a property of objects that describes their resistance to changes in motion. Inertia is dependent on mass, not matter itself.

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  • 26. 

    What is a reference point?

    • When an object changes position

    • The object that stays in place

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. The object that stays in place
    Explanation
    A reference point is the object that stays in place. It is used as a fixed point to measure the position or motion of other objects. By observing how other objects change position relative to the reference point, we can determine their motion or displacement.

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  • 27. 

    A passenger in the rear seat of a car moving at a steady speed is at rest relative to

    • The side of the road.

    • The pedestrian on the corner ahead.

    • The front seat of the car.

    • The wheels of the car.

    Correct Answer
    A. The front seat of the car.
    Explanation
    The passenger in the rear seat of a car moving at a steady speed is at rest relative to the front seat of the car because both the passenger and the front seat are moving at the same speed and in the same direction. The passenger is not at rest relative to the side of the road, the pedestrian on the corner ahead, or the wheels of the car, as they are all moving relative to the passenger.

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  • 28. 

    If you push or pull an object, the __________ (MASS/ACCELERATION) will change.

    Correct Answer
    acceleration
    Explanation
    When you push or pull an object, the mass of the object remains constant. However, the force applied to the object causes it to accelerate. This means that the object's velocity changes over time. Therefore, the correct answer is acceleration.

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  • 29. 

    The slope of a line on a distance-time graph is

    • Distance

    • Time

    • Speed

    • Displacement

    Correct Answer
    A. Speed
    Explanation
    The slope of a line on a distance-time graph represents the rate at which an object is moving. In this case, the correct answer is "Speed" because speed is defined as the distance traveled per unit of time. The slope of the line on a distance-time graph gives the speed of the object, indicating how fast or slow it is moving.

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  • 30. 

    Balanced forces are 

    • When the forces of an object produce a net force larger than zero.

    • When the forces are the same .

    • When the forces of an object produce a net force equal to zero.

    • None of the above

    Correct Answer
    A. When the forces of an object produce a net force equal to zero.
    Explanation
    Balanced forces occur when the forces acting on an object are equal in magnitude and opposite in direction, resulting in a net force of zero. This means that the object will remain at rest if it was initially at rest, or it will continue to move at a constant velocity if it was already in motion. In other words, the forces are balanced and cancel each other out, leading to no change in the object's motion.

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  • 31. 

    The faster the motion, the steeper the 

    • Incline

    • Slope

    • Both A and B

    • Neither A nor B

    Correct Answer
    A. Both A and B
    Explanation
    The explanation for the correct answer "Both A and B" is that the statement is comparing the speed of motion with the steepness of the incline or slope. It suggests that as the motion becomes faster, the incline or slope becomes steeper. This implies a direct relationship between the speed of motion and the steepness of the incline or slope. Therefore, both options A (incline) and B (slope) are correct.

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  • 32. 

    A volleyball is moving through the air at the same speed in the same direction until its motion is changed by an unbalanced force. Which Law of Motion is this an example of?

    • Newton's First Law of Motion

    • Newton's Second Law of Motion

    • Newton's Third Law of Motion

    • All of the above

    Correct Answer
    A. Newton's Second Law of Motion
    Explanation
    This question is asking for the law of motion that explains the change in motion of a volleyball when an unbalanced force acts on it. Newton's First Law of Motion states that an object at rest will stay at rest and an object in motion will stay in motion with the same speed and direction unless acted upon by an unbalanced force. Therefore, this example does not fit Newton's First Law. Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. This law does not directly explain the change in motion of the volleyball. Newton's Second Law of Motion states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. This law explains the change in motion of the volleyball due to the unbalanced force, so the correct answer is Newton's Second Law of Motion.

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  • 33. 

    The measure of an object's position during a unit of time is called _________.

    • Speed

    • Velocity

    • Acceleration

    • Momentum

    Correct Answer
    A. Speed
    Explanation
    The measure of an object's position during a unit of time is called speed. Speed is a scalar quantity that represents the rate at which an object moves. It is calculated by dividing the distance traveled by the time taken. Unlike velocity, which includes both the speed and direction of an object's motion, speed only focuses on the magnitude of the motion. Acceleration refers to the rate of change of velocity, while momentum is the product of an object's mass and velocity.

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  • 34. 

    Instantaneous speed is measured

    • At the starting point.

    • When the object reaches its destination.

    • At a particular instant.

    • Over the duration of the trip.

    Correct Answer
    A. At a particular instant.
    Explanation
    Instantaneous speed is a measure of an object's speed at a specific moment in time. It is not measured at the starting point or when the object reaches its destination, as these would be average speeds over a period of time. Instead, instantaneous speed is measured at a particular instant, providing a snapshot of the object's speed at that exact moment.

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  • 35. 

    When the only force acting on an object is gravity, ____________ is occurring

    Correct Answer
    free fall
    Explanation
    When the only force acting on an object is gravity, the object is said to be in free fall. In free fall, the object is accelerating downwards solely due to the force of gravity, with no other forces counteracting it. This means that the object is not supported by any surface or experiencing any other forces that would oppose its motion. Free fall is commonly observed when objects are dropped from a height or when a person jumps out of an airplane without a parachute.

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Matt Balanda |BS (Aerospace Engineering) |
Science Teacher
Matt Balanda, a Calvary Chapel Christian School leader with a Bachelor's in Aerospace Engineering and Mathematics, transitioned from Aerospace Engineering to Education with a Master's from California Baptist University. As the High School Vice-Principal and Physics teacher, he nurtures students' love of learning and faith, creating an enriching and transformational educational experience.

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