Net Force Quiz - Learn Physics Concepts

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Matt Balanda, BS (Aerospace Engineering) |
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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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  • 1/10 Questions

    What is the net force on an object if two equal forces push in opposite directions?

    • 0 N
    • 10 N
    • 20 N
    • 30 N
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About This Quiz

Do you want to push your understanding of forces to the limit? Take our Net Force Quiz and challenge yourself to master the concept of net force. In physics, the net force is the total force acting on an object, combining all the individual forces into one overall force. This quiz will test your ability to identify and calculate net forces in various situations, helping you understand how they affect the motion of objects.

From simple scenarios involving just a couple of forces to more complex setups with multiple forces at play, each question is designed to enhance your problem-solving skills. You will need to analyze the direction, magnitude, and type of forces involved to determine the resulting net force.

Net Force Quiz - Learn Physics Concepts - Quiz

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  • 2. 

    If three forces, 7 N, 2 N, and 4 N, act on an object in the same direction, what is the net force?

    • 9 N

    • 13 N

    • 11 N

    • 3 N

    Correct Answer
    A. 13 N
    Explanation
    When three forces act in the same direction, they are simply added together to find the net force. Adding 7 N, 2 N, and 4 N results in a total net force of 7 N + 2 N + 4 N = 13 N. This sum indicates the combined strength of the forces propelling the object in that direction.

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  • 3. 

    An object is pulled with 15 N to the north and 10 N to the south. What is the net force?

    • 5 N north

    • 5 N south

    • 25 N north

    • 25 N south

    Correct Answer
    A. 5 N north
    Explanation
    When calculating forces acting in opposite directions, subtract the smaller from the larger and keep the direction of the larger force. Here, 15 N north and 10 N south result in a net force of 15 N - 10 N = 5 N north. The object will experience a resultant force pushing it northward as the northern force is stronger.

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  • 4. 

    What is the net force if an object is subjected to 20 N up and 20 N down?

    • 0 N

    • 40 N up

    • 40 N down

    • 20 N

    Correct Answer
    A. 0 N
    Explanation
    When an object experiences equal forces of 20 N pushing up and 20 N pushing down, these forces directly oppose each other and have equal magnitudes but opposite directions. According to the principles of vector addition in physics, when two equal but opposite forces act on an object, they cancel each other out completely. Therefore, the net force acting on the object is zero Newtons (0 N). This cancellation means that there is no resultant force to alter the object’s state of motion, leading it to either remain at rest or continue moving at a constant velocity if it was already in motion.

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  • 5. 

    A car has a forward force of 300 N and a frictional force of 250 N acting against it. What is the net force?

    • 50 N forward

    • 50 N backward

    • 550 N forward

    • 550 N backward

    Correct Answer
    A. 50 N forward
    Explanation
    The car experiencing a forward force of 300 N and a backward frictional force of 250 N results in a net forward force calculated by 300 N - 250 N = 50 N. This remaining forward force indicates that the car will accelerate forward, as the drive force exceeds the friction resisting it.

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  • 6. 

    What happens to the motion of an object if the net force on it is zero?

    • It speeds up.

    • It slows down.

    • It changes direction.

    • It stays the same.

    Correct Answer
    A. It stays the same.
    Explanation
    A net force of zero indicates that all forces acting on an object are balanced. There are no unbalanced forces to change the object’s motion, meaning it will maintain its current state of motion. According to Newton's first law of motion, an object at rest stays at rest, and an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Here, with zero net force, the object’s motion remains unchanged.

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  • 7. 

    Calculate the net force: 10 N to the left and 4 N to the right.

    • 6 N to the left

    • 6 N to the right

    • 14 N to the left

    • 14 N to the right

    Correct Answer
    A. 6 N to the left
    Explanation
    To find the net force when 10 N acts to the left and 4 N to the right, subtract the smaller force from the larger force while retaining the direction of the larger force. The calculation is 10 N - 4 N = 6 N. The resulting net force is 6 N to the left, indicating that the leftward force predominates, causing the object to move left.

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  • 8. 

    If a 5 N force and a 3 N force act in the same direction, what is the net force?

    • 2 N

    • 8 N

    • 15 N

    • 5 N

    Correct Answer
    A. 8 N
    Explanation
    If two forces, 5 N and 3 N, act in the same direction, their magnitudes simply add up. The vector addition here is straightforward: 5 N + 3 N = 8 N. This results in a net force of 8 N in the direction both forces were acting. The cumulative effect of these aligned forces increases the total force exerted on the object, moving it more effectively in their shared direction.

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  • 9. 

    Three forces act on an object: 5 N left, 10 N right, and 3 N left. What is the net force?

    • 2 N left

    • 2 N right

    • 18 N left

    • 18 N right

    Correct Answer
    A. 2 N right
    Explanation
    Calculating the net force with three forces involves summing up like directions and then finding the difference. Here, 5 N and 3 N left add up to 8 N left, and the single rightward force is 10 N. The net force is calculated by subtracting the total leftward force from the rightward force: 10 N - 8 N = 2 N right. This means the rightward force slightly overcomes the leftward forces, nudging the object right.

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  • 10. 

    An object has four forces acting on it: 20 N north, 20 N south, 10 N east, and 5 N west. What is the net force?

    • 5 N east

    • 5 N west

    • 10 N east

    • 15 N east

    Correct Answer
    A. 5 N east
    Explanation
    With four forces acting in two dimensions (north-south and east-west), cancel out opposing forces first. 20 N north cancels with 20 N south, and 10 N east partially cancels with 5 N west, leaving a net force of 5 N east. This remaining force means the object will move eastward.

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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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  • Current Version
  • Aug 30, 2024
    Quiz Edited by
    ProProfs Editorial Team

    Expert Reviewed by
    Matt Balanda
  • Apr 15, 2021
    Quiz Created by
    Themes
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