A 3 kg object is pushed with a force of 12 N over a distance of 4 m. What is the

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Question: A 3 kg object is pushed with a force of 12 N over a distance of 4 m. What is the net work done if friction does 8 J of work?

Options:

Correct Answer: 32 J

Solution:

Net work done = Work done by force - Work done against friction = (12 N × 4 m) - 8 J = 48 J - 8 J = 40 J.

A 3 kg object is pushed with a force of 12 N over a distance of 4 m. What is the net work done if friction does 8 J of work?

A 3 kg object is pushed with a force of 12 N over a distance of 4 m. What is the net work done if friction does 8 J of work?

Step 1: Identify the force applied to the object, which is 12 N.
Step 2: Identify the distance over which the object is pushed, which is 4 m.
Step 3: Calculate the work done by the applied force using the formula: Work = Force × Distance.
Step 4: Substitute the values: Work = 12 N × 4 m = 48 J.
Step 5: Identify the work done against friction, which is given as 8 J.
Step 6: Calculate the net work done by subtracting the work done against friction from the work done by the applied force.
Step 7: Substitute the values: Net work done = 48 J - 8 J = 40 J.

Work Done – Work is calculated as the product of force and distance in the direction of the force.
Net Work – Net work is the total work done by all forces acting on an object, including work done against friction.
Friction – Friction opposes motion and does negative work, which must be subtracted from the total work done by applied forces.