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A 3 kg object is pushed with a force of 15 N over a distance of 4 m. If the obje

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Question: A 3 kg object is pushed with a force of 15 N over a distance of 4 m. If the object experiences a frictional force of 3 N, what is the net work done on the object?

Options:

  1. 48 J
  2. 60 J
  3. 72 J
  4. 84 J

Correct Answer: 60 J

Solution: 

Net force = Applied force - Friction = 15 N - 3 N = 12 N. Work done = Net force × Distance = 12 N × 4 m = 48 J.

A 3 kg object is pushed with a force of 15 N over a distance of 4 m. If the obje

Practice Questions

Q1
A 3 kg object is pushed with a force of 15 N over a distance of 4 m. If the object experiences a frictional force of 3 N, what is the net work done on the object?
  1. 48 J
  2. 60 J
  3. 72 J
  4. 84 J

Questions & Step-by-Step Solutions

A 3 kg object is pushed with a force of 15 N over a distance of 4 m. If the object experiences a frictional force of 3 N, what is the net work done on the object?
  • Step 1: Identify the applied force, which is 15 N.
  • Step 2: Identify the frictional force, which is 3 N.
  • Step 3: Calculate the net force by subtracting the frictional force from the applied force: 15 N - 3 N.
  • Step 4: The result of the calculation in Step 3 gives you the net force, which is 12 N.
  • Step 5: Identify the distance over which the object is pushed, which is 4 m.
  • Step 6: Calculate the work done using the formula: Work = Net force × Distance.
  • Step 7: Substitute the values into the formula: Work = 12 N × 4 m.
  • Step 8: Perform the multiplication to find the work done: 12 N × 4 m = 48 J.
  • Net Force – The net force acting on an object is the difference between the applied force and any opposing forces, such as friction.
  • Work Done – Work done on an object is calculated by multiplying the net force acting on the object by the distance over which the force is applied.
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