Energy Test Review

Front

What is work in physics?

Back

Work is defined as the product of the force applied to an object and the distance over which that force is applied. It is calculated using the formula: W = F • d, where W is work, F is force, and d is distance.

Front

What is the unit of work?

Back

The unit of work is the Joule (J). One Joule is defined as the work done when a force of one newton displaces an object by one meter.

Front

What is the formula for calculating power?

Back

Power is calculated using the formula: P = W/t, where P is power, W is work done, and t is the time taken.

Front

What is the unit of power?

Back

The unit of power is the Watt (W). One Watt is equal to one Joule per second.

Front

What is energy?

Back

Energy is defined as the ability to do work or produce change.

Front

What is the principle of energy transformation?

Back

Energy transformation refers to the process of changing energy from one form to another, such as from chemical energy to thermal energy.

Front

What is an example of energy transformation in a burning match?

Back

In a burning match, chemical energy is transformed into thermal energy and light energy.

Front

How do you calculate work done when a force is applied?

Back

Work done can be calculated using the formula: W = F • d, where W is work, F is the force applied, and d is the distance moved in the direction of the force.

Front

If a force of 20 N moves an object 13 m, how much work is done?

Back

W = F • d = 20 N • 13 m = 260 J.

Front

How much time is needed to produce 720 Joules of work with 90 Watts of power?

Back

Using the formula P = W/t, rearranging gives t = W/P. Thus, t = 720 J / 90 W = 8 seconds.