Physics Review: Work & Energy

Front

What is Potential Energy (PE)?

Back

Potential Energy (PE) is the energy stored in an object due to its position or height. It is calculated using the formula PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

What is Kinetic Energy (KE)?

Back

Kinetic Energy (KE) is the energy of an object in motion. It is calculated using the formula KE = 1/2 mv², where m is mass and v is velocity.

Front

What is the formula for calculating work done?

Back

Work done (W) is calculated using the formula W = Fd, where F is the force applied and d is the distance moved in the direction of the force.

Front

What happens to potential energy as an object falls?

Back

As an object falls, its potential energy decreases while its kinetic energy increases.

Front

Where is kinetic energy greatest in a pendulum swing?

Back

Kinetic energy is greatest at the bottom of the swing.

Front

What is the relationship between work and energy?

Back

Work is done when energy is transferred from one system to another. The work done on an object results in a change in its energy.

Front

How do you calculate the work done when a force is applied at an angle?

Back

When a force is applied at an angle, the work done is calculated using W = Fd cos(θ), where θ is the angle between the force and the direction of motion.

Front

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

Back

The unit of work in SI is the Joule (J).

Front

What is the gravitational potential energy of a 5 kg object at a height of 10 m?

Back

PE = mgh = 5 kg * 9.8 m/s² * 10 m = 490 J.

Front

If a 10 N force moves an object 4 m, how much work is done?

Back

W = Fd = 10 N * 4 m = 40 J.