Physics Review: Work Energy Power Test

Front

What is Power in physics?

Back

Power is the rate at which work is done or energy is transferred, measured in watts (W).

Front

How do you calculate Work?

Back

Work is calculated using the formula: Work = Force x Distance x cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the formula for calculating Kinetic Energy?

Back

Kinetic Energy (KE) = 0.5 x mass (m) x velocity (v)^2.

Front

What is Gravitational Potential Energy?

Back

Gravitational Potential Energy (PE) is the energy an object possesses due to its height above the ground, calculated as PE = mass (m) x gravity (g) x height (h).

Front

What is the relationship between Work, Energy, and Power?

Back

Work is the transfer of energy, Power is the rate of doing work, and Energy is the capacity to do work.

Front

Define Mechanical Energy.

Back

Mechanical Energy is the total amount of potential and kinetic energy in a system.

Front

What is the unit of Work?

Back

The unit of Work is the Joule (J).

Front

If a machine has a power output of 800 W, how much work can it do in 10 seconds?

Back

Work = Power x Time = 800 W x 10 s = 8000 J.

Front

What is the formula for calculating Power?

Back

Power = Work / Time.

Front

How does height affect Gravitational Potential Energy?

Back

Gravitational Potential Energy increases with height; doubling the height doubles the potential energy.