Physics - Work and Power Practice Problems

Front

What is Work in Physics?

Back

Work is done when a force causes an object to move. It is calculated as the product of the force and the distance moved in the direction of the force. Formula: Work (W) = Force (F) x Distance (d).

Front

What is Power in Physics?

Back

Power is the rate at which work is done or energy is transferred. It is calculated as the work done divided by the time taken. Formula: Power (P) = Work (W) / Time (t).

Front

How do you calculate Work?

Back

Work is calculated using the formula: Work (W) = Force (F) x Distance (d). For example, if a force of 10 N moves an object 5 m, the work done is 50 J.

Front

How do you calculate Power?

Back

Power is calculated using the formula: Power (P) = Work (W) / Time (t). For example, if 100 J of work is done in 4 seconds, the power is 25 W.

Front

What is the unit of Work?

Back

The unit of Work is the Joule (J). 1 Joule is defined as the work done when a force of 1 Newton moves an object 1 meter.

Front

What is the unit of Power?

Back

The unit of Power is the Watt (W). 1 Watt is equal to 1 Joule per second (1 W = 1 J/s).

Front

If a climber lifts a weight of 900 N to a height of 100 m, how much work is done?

Back

The work done is 90,000 J (Work = Force x Distance = 900 N x 100 m).

Front

If it takes 5 seconds to do 250 J of work, what is the power?

Back

The power required is 50 W (Power = Work / Time = 250 J / 5 s).

Front

A horse does 15,000 J of work in 20 seconds. What is the horse's power?

Back

The horse's power is 750 W (Power = Work / Time = 15,000 J / 20 s).

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, allowing it to move or change.