kinetic and potential energy calculations

Front

What is gravitational potential energy?

Back

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field, calculated as PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

Front

How do you calculate gravitational potential energy?

Back

PE = mgh, where PE is potential energy, m is mass in kilograms, g is the acceleration due to gravity (approximately 9.8 m/s²), and h is height in meters.

Front

What is kinetic energy?

Back

Kinetic energy is the energy an object has due to its motion, calculated as KE = 1/2 mv², where m is mass and v is velocity.

Front

How do you calculate kinetic energy?

Back

KE = 1/2 mv², where KE is kinetic energy, m is mass in kilograms, and v is velocity in meters per second.

Front

What is the formula for work done?

Back

Work done (W) is calculated as W = Fd, where F is force in newtons and d is distance in meters.

Front

If 150 Joules of work is done moving a box 10 meters, what is the force applied?

Back

Force (F) = Work (W) / Distance (d) = 150 J / 10 m = 15 N.

Front

What is the unit of energy?

Back

The unit of energy is the Joule (J).

Front

What is the relationship between potential energy and height?

Back

Potential energy increases as height increases, assuming mass and gravity remain constant.

Front

What happens to kinetic energy if the speed of an object doubles?

Back

If the speed doubles, the kinetic energy increases by a factor of four, since KE = 1/2 mv².

Front

What is the mass of an object if it has a potential energy of 56.8 J at a height of 2.5 m?

Back

Mass (m) = PE / (gh) = 56.8 J / (9.8 m/s² * 2.5 m) = 2.32 kg.