Energy, Work and Power

Front

What is the formula for calculating power?

Back

Power = Work / Time

Front

Define work in the context of physics.

Back

Work is done when a force causes an object to move in the direction of the force.

Front

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

Back

The unit of power is the watt (W).

Front

How can a person decrease their power output while performing work?

Back

By decreasing the speed at which they perform the work.

Front

What type of energy is associated with the motion of an object?

Back

Kinetic energy.

Front

What is radiant energy?

Back

Radiant energy is energy that travels by waves or particles, particularly electromagnetic radiation such as light.

Front

Explain 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 happens to mechanical energy when friction is present?

Back

Mechanical energy is converted into thermal energy due to friction.

Front

If a student does 90 joules of work in 30 seconds, how do you calculate their power output?

Back

Power = Work / Time = 90 joules / 30 seconds = 3 watts.

Front

What is the significance of the height in calculating gravitational potential energy?

Back

The height determines the potential energy an object has due to its position in a gravitational field.