True or false about work and energy

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   No work is done when the force is zero.

2. Statement is true

   No

   Statement

   A force at right angles to motion does work.

3. Statement is true

   Yes

   Statement

   An object at rest has zero kinetic energy.

4. Statement is true

   No

   Statement

   A fixed pulley reduces the force needed.

5. Statement is true

   Yes

   Statement

   Power is the rate at which work is done.

Instructions

Decide whether each statement is true or false.

Explanation