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energy

What two variables influence kinetic energy?

kinetic energy

A 50-kg girl is playing soccer. She runs toward the ball at a speed of 7 m/s. How much kinetic energy does she have as she runs? Calculate the answer to this problem using the equation KE = ½mv2.

Work changes the energy of an object. So if an object, such as a truck, has a lot of kinetic energy, it takes a lot of work to stop it. Imagine that there are two trucks that are the same mass (2,000 kg) and have the same braking force. Truck A is traveling 20 m/s, and Truck B is traveling 40 m/s. How do you think their kinetic energies will compare?

A 2 kg bowling ball sits on top of a building that is 40 m tall. What is the KE?

What is another object that stores

elastic potential energy?

elastic potential energy?

A 2 kg bowling ball sits on top of a building that is 40 m tall. What is the PE?

What is another object that stores

gravitational potential energy?

gravitational potential energy?

A 2 kg bowling ball sits on top of a building that is 40 m tall. What is the GPE?

A 2-kg bowling ball is 2.5 meters off the ground on a post when it falls. Just before it reaches the ground, it is traveling 7 m/s.

What is the ke?

What is the ke?

A 2-kg bowling ball is 2.5 meters off the ground on a post when it falls. Just before it reaches the ground, it is traveling 7 m/s.

What is the gpe?

What is the gpe?

Explain the difference between kinetic energy and potential energy.

How does elastic potential energy differ from gravitational potential energy?

Determine the gravitational potential energy of a 7.5-N object ready to fall from a height of 5 m. Show your work.