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Work done by a constant force Knowledge-Based Practice

Physics · Energy, Work & Power · Physics · Work

10 Physics practice questions on Work done by a constant force. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    A constant force of 75 N is applied to pull a crate across a level floor. If this force does 450 J of work while directed at an angle of 60° above the horizontal, what is the magnitude of the displacement of the crate?

    • A) 3.0 m
    • B) 6.0 m
    • C) 12 m
    • D) 24 m
  2. 2.

    A constant force F⃗=(6.0i^−4.0j^)\vec{F} = (6.0\hat{i} - 4.0\hat{j}) N acts on a particle while it undergoes a displacement Δr⃗=(5.0i^+3.0j^)\Delta\vec{r} = (5.0\hat{i} + 3.0\hat{j}) m. What is the work done by this force on the particle?

    • A) 42 J
    • B) 30 J
    • C) -18 J
    • D) 18 J
  3. 3.

    A constant force of 50 N acts on a cart as it moves along a straight horizontal track for a distance of 10 m. If the force does 400 J of work on the cart, what is the magnitude of the component of this force perpendicular to the track?

    • A) 10 N
    • B) 30 N
    • C) 40 N
    • D) 50 N
  4. 4.

    A constant force of 60 N acts on a cart as it moves 5.0 m along a straight horizontal track. If the work done on the cart by this force is 150 J, what is the angle between the direction of the force and the displacement?

    • A) 30°
    • B) 60°
    • C) 45°
    • D) 0°
  5. 5.

    A constant horizontal force of 15 N acts on an initially stationary 5.0 kg object on a frictionless surface for 4.0 s. What is the work done by this force during this time?

    • A) 60 J
    • B) 180 J
    • C) 360 J
    • D) 720 J
  6. 6.

    A worker pushes a crate along a level floor with a constant horizontal force of 80 N while a constant frictional force of 30 N opposes the motion. What is the net work done on the crate over a displacement of 6.0 m?

    • A) 180 J
    • B) 480 J
    • C) 300 J
    • D) 660 J
  7. 7.

    A 4.0 kg package falls freely through a vertical distance of 5.0 m near Earth's surface. Taking the acceleration due to gravity as 9.8 m/s2, what is the work done on the package by the gravitational force?

    • A) 98 J
    • B) 196 J
    • C) -196 J
    • D) 39.2 J
  8. 8.

    A student carries a box horizontally across a level room for a distance of 6.0 m while applying a constant upward force of 40 N. What is the work done on the box by this upward force?

    • A) 240 J
    • B) -240 J
    • C) 0 J
    • D) 6.7 J
  9. 9.

    A constant braking force of 150 N is applied to a bicycle moving along a straight horizontal path, bringing it to a stop over a displacement of 12 m. What is the work done by the braking force on the bicycle?

    • A) +1800 J
    • B) -12.5 J
    • C) 0 J
    • D) -1800 J
  10. 10.

    A constant force of 25 N acts on a crate, displacing it 4.0 m along a horizontal floor at an angle of 60° above the horizontal. How much work is done by this force on the crate?

    • A) 100 J
    • B) 50 J
    • C) 87 J
    • D) 25 J

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