The Quiz Of Three Laws Of Motion

1. According to Newton's First Law, an object in motion will remain in motion unless what?

Gravity acts on it.

It is acted upon by an unbalanced force.

It gains mass.

It is observed by a person.

The answer is "It is acted upon by an unbalanced force." Newton's First Law states that an object will remain at rest or move in a straight line at a constant speed unless an external force acts on it. For example, a soccer ball will keep moving unless forces like friction or a player's foot stop it.

Explanation

The answer is "It is acted upon by an unbalanced force." Newton's First Law states that an object will remain at rest or move in a straight line at a constant speed unless an external force acts on it. For example, a soccer ball will keep moving unless forces like friction or a player's foot stop it.

2. What does Newton's Third Law of Motion state?

Objects in motion stay in motion.

Force equals mass times acceleration.

For every action, there is an equal and opposite reaction.

An object remains at rest.

The answer is "For every action, there is an equal and opposite reaction." Newton's Third Law of Motion explains that forces always occur in pairs. When one object exerts a force on another, the second object exerts an equal and opposite force back on the first. This principle is evident in activities like jumping off a boat onto a dock, where the force that pushes the person forward also pushes the boat backward.

Explanation

The answer is "For every action, there is an equal and opposite reaction." Newton's Third Law of Motion explains that forces always occur in pairs. When one object exerts a force on another, the second object exerts an equal and opposite force back on the first. This principle is evident in activities like jumping off a boat onto a dock, where the force that pushes the person forward also pushes the boat backward.

3. Which of Newton's laws is represented by the formula F=ma?

First Law of Motion

Second Law of Motion

Third Law of Motion

Law of Universal Gravitation

The answer is the Second Law of Motion. Newton's Second Law is represented by the formula F=ma, where F is force, m is mass, and a is acceleration. This law provides a quantitative relationship between the force acting on an object and its acceleration, showing that the acceleration is directly proportional to the force and inversely proportional to the mass.

Explanation

The answer is the Second Law of Motion. Newton's Second Law is represented by the formula F=ma, where F is force, m is mass, and a is acceleration. This law provides a quantitative relationship between the force acting on an object and its acceleration, showing that the acceleration is directly proportional to the force and inversely proportional to the mass.

4. What determines the acceleration of an object according to Newton's Second Law?

Its speed

Its mass and the force applied

Its direction

Its density

The answer is "Its mass and the force applied." Newton's Second Law states that the acceleration of an object depends on the net force acting upon it and its mass. If more force is applied to an object, it accelerates more; if the object has more mass, it accelerates less for the same amount of force.

Explanation

The answer is "Its mass and the force applied." Newton's Second Law states that the acceleration of an object depends on the net force acting upon it and its mass. If more force is applied to an object, it accelerates more; if the object has more mass, it accelerates less for the same amount of force.

5. If a ball is rolled on the ground, which force eventually stops it?

Gravity

Friction

Magnetic force

Centripetal force

The answer is "Friction." When a ball is rolled on the ground, it eventually stops due to the force of friction acting opposite to the ball's direction of motion. Friction is a resistive force that opposes the relative motion between two surfaces in contact, such as the ball and the ground.

Explanation

The answer is "Friction." When a ball is rolled on the ground, it eventually stops due to the force of friction acting opposite to the ball's direction of motion. Friction is a resistive force that opposes the relative motion between two surfaces in contact, such as the ball and the ground.

6. If a 5 kg object is accelerated at 3 m/s², what is the force acting on it?

8 N

10 N

15 N

20 N

The answer is "15 N." According to Newton's Second Law, force can be calculated using the formula F=ma. For an object with a mass of 5 kg and an acceleration of 3 m/s², the force is F=5 kg×3 m/s²=15N.

Explanation

The answer is "15 N." According to Newton's Second Law, force can be calculated using the formula F=ma. For an object with a mass of 5 kg and an acceleration of 3 m/s², the force is F=5 kg×3 m/s²=15N.

7. When a rocket launches, which law explains the upward movement due to the expulsion of gases?

First Law of Motion

Second Law of Motion

Third Law of Motion

Law of Conservation of Energy

The answer is the Third Law of Motion. When a rocket expels gases downward, it generates an upward force that propels the rocket into space. This action-reaction pair follows Newton's Third Law: the action of expelling gases downward results in a reactionary force that pushes the rocket upward, enabling space travel and launching satellites.

Explanation

The answer is the Third Law of Motion. When a rocket expels gases downward, it generates an upward force that propels the rocket into space. This action-reaction pair follows Newton's Third Law: the action of expelling gases downward results in a reactionary force that pushes the rocket upward, enabling space travel and launching satellites.

8. Which law explains the motion of a swimmer pushing against the water and moving forward?

First Law of Motion

Second Law of Motion

Archimedes' Principle

Third Law of Motion

The answer is the Third Law of Motion. When a swimmer pushes against the water, the water pushes back with an equal and opposite force, propelling the swimmer forward. This action-reaction force pair is essential for understanding movement in fluids like water.

Explanation

The answer is the Third Law of Motion. When a swimmer pushes against the water, the water pushes back with an equal and opposite force, propelling the swimmer forward. This action-reaction force pair is essential for understanding movement in fluids like water.

9. Which law of motion explains why passengers lurch forward in a car when it suddenly stops?

First Law of Motion (Law of Inertia)

Second Law of Motion (Law of Acceleration)

Third Law of Motion (Action-Reaction)

Law of Gravitation

The answer is the First Law of Motion (Law of Inertia). This law explains that objects in motion will continue moving in the same direction and at the same speed unless acted upon by an external force. In a car that suddenly stops, passengers move forward because their bodies are still in motion. The seatbelt or the dashboard provides the external force that changes their state of motion.

Explanation

The answer is the First Law of Motion (Law of Inertia). This law explains that objects in motion will continue moving in the same direction and at the same speed unless acted upon by an external force. In a car that suddenly stops, passengers move forward because their bodies are still in motion. The seatbelt or the dashboard provides the external force that changes their state of motion.

10. What is the concept of inertia most closely related to?

Speed

Volume

Temperature

Mass

The answer is "Mass." Inertia, the tendency of an object to resist changes in its state of motion, is directly related to the mass of the object. The greater the mass, the greater the inertia, meaning more force is needed to change the object's state of rest or motion.

Explanation

The answer is "Mass." Inertia, the tendency of an object to resist changes in its state of motion, is directly related to the mass of the object. The greater the mass, the greater the inertia, meaning more force is needed to change the object's state of rest or motion.