Energy Stores and Transfers

Question 1

What is gravitational potential energy?

Answer 1

> energy stored in an object because of where it’s positioned in the Earth’s gravitational force
depends on the mass and height above ground and gravitational field strength

Question 2

What is the gravitational field strength on Earth?

Answer 2

10N/kg

Question 3

What is work?

Answer 3

> the amount of energy transferred when a force moves

Question 4

What is kinetic energy?

Answer 4

> energy that an object has due to its motion

Question 5

How to reduce wasted energy?

Answer 5

> to reduce heat energy caused by friction, lubricate the moving parts
when the resistance of wires causes heat energy, use wires with little electrical resistance
to reduce sound created by machinery, tighten loose parts to reduce vibration

Question 6

What is power?

Answer 6

> how quickly energy is transferred

>the more powerful the appliance, the faster the rate it transfers energy