Work Energy and Power

Question 1

Work done equation

Answer 1

Force x distance moved in the direction of the force

Question 2

What is work done equal to

Answer 2

Energy transferred

Question 3

2 classifications of energy of systems with mass

Answer 3

KE and GPE

Question 4

Define kinetic energy

Answer 4

Energy due to the movement of an object

Question 5

Define gravitational potential energy

Answer 5

Energy due to the position of an object in the Earths gravitational field

Question 6

Define chemical energy

Answer 6

Energy contained within the chemical bonds between atoms

Question 7

Define elastic potential energy

Answer 7

Energy stored in an object as a result of reversible change in shape

Question 8

Define electrical potential energy

Answer 8

Energy of electrical charges due to their position in an electrical field

Question 9

Define nuclear energy

Answer 9

Energy within the nuclei of atoms

Question 10

Define radiant (electromagnetic) energy

Answer 10

Energy associated with all EM waves

Stored within the oscillating electric and magnetic fields

Question 11

Define sound energy

Answer 11

Energy of mechanical waves due to the movement of atoms

Question 12

Define internal (heat or thermal) energy

Answer 12

The sum of random PE and KE of atoms in a system

Question 13

Kinetic energy equation

Answer 13

1/2 m v^2

Question 14

GPE equation

Answer 14

mgh

Question 15

Power definition

Answer 15

Rate of work done

Question 16

Power equation

Answer 16

W / t

Question 17

Power in motion equation

Answer 17

Fv

Question 18

Efficiency equation

Answer 18

(Useful output energy / total input energy) x 100

Percentage value

Question 19

What does the principle of conservation of energy

Answer 19

Total energy of a closed system remains constant - energy can never be created or destroyed but it can be transferred from one form to another

Question 20

What is mgh equal to

Answer 20

1/2mv^2

where v is the final speed of the object