Work and Power - Rehearse

Front

What is the definition of work in physics?

Back

Work is done when a force causes an object to move a distance. It is calculated as the product of the force and the distance moved in the direction of the force.

Front

True or False: Work is done when a weightlifter holds a barbell still above his head.

Back

False. Work is only done when the object is moved.

Front

How is work calculated?

Back

Work (W) is calculated using the formula W = F × d, where F is the force applied and d is the distance moved.

Front

If a student applies a force of 10 Newtons to lift a box 2 meters, how much work is done?

Back

20 J (Work = 10 N × 2 m).

Front

What is the formula for calculating power?

Back

Power (P) is calculated as P = W / t, where W is work done and t is the time taken.

Front

What is the unit of work in the International System of Units (SI)?

Back

The unit of work is the Joule (J).

Front

If a force of 200 N is applied over a distance of 50 m, how much work is done?

Back

10,000 J (Work = 200 N × 50 m).

Front

What is the relationship between work and energy?

Back

Work is a transfer of energy. When work is done on an object, energy is transferred to that object.

Front

What is power in terms of work and time?

Back

Power is the rate at which work is done or energy is transferred over time.

Front

If 100 J of work is done in 5 seconds, what is the power?

Back

20 W (Power = 100 J / 5 s).