Work Done

Question 1

What is work done in the context of physics?

Answer 1

Work done is the product of force and displacement in the direction of the force.

Question 2

What are the units of work done, and how are they derived?

Answer 2

The unit of work done is the joule (J), derived from force (newton) times distance (meter).

Question 3

If there is no displacement, what is the work done?

Answer 3

A: If there is no displacement, the work done is zero.

Question 4

How does the angle between force and displacement affect the work done?

Answer 4

The work done is maximized when the force is applied in the direction of motion (θ = 0°).

Question 5

Explain the difference between positive and negative work done.

Answer 5

Positive work is done when the force and displacement are in the same direction; negative when opposite.

Question 6

Calculate the work done when lifting a 50 kg object vertically by 2 meters against gravity.

Answer 6

Work done (W) = Force (F) × Displacement (d) × cos(θ) = 50 N × 2 m × cos(0°) = 100 J.