P3d

Question 1

What is work done?

Answer 1

-when a force makes an object move, energy is transferred and work is done

Question 2

What is gravitational potential energy?

Answer 2

-the energy something has because of its height above the ground

Question 3

What is kinetic energy?

Answer 3

-the energy of movement

Question 4

What does kinetic energy depend on?

Answer 4

• mass
• speed
• the greater the mass and speed, then more kinetic energy

Question 5

What happens when you fall?

Answer 5

• your gravitational potential energy is converted into kinetic energy
• the further it falls, the faster it goes

Question 6

How do roller coasters work?

Answer 6

1-energy given to rollers coaster at the start
2-as the roller coaster moves the energy is kinetic
3-as the roller coasters goes up the kinetic energy is converted into gravitational potential energy
4-as the roller coaster descends, the gravitational potential energy is converted into kinetic energy

Question 7

What is power?

Answer 7

-a measure of how quickly a work is is being done

Question 8

What happens the the energy used to rise an object off the ground?

Answer 8

-object can store it and it can be changed to kinetic energy if it falls

Question 9

What is a powerful machine?

Answer 9

-one that transfers lots of energy in a short space of time