Work, Energy and Power

Question 1

What is “Work Done”

Answer 1

Work done is whenever a force moves an object. If it doesn’t move, then there is no work being done

Question 2

What is the equation that includes work done, distance moved and force

Answer 2

Work done = force x distance moved

Question 3

What are the units of Work

Answer 3

Joules (J)

Question 4

What are the units of force

Answer 4

Newtons (N)

Question 5

Energy is always…….; this means that “energy cannot be…….or………“but it can be turned from one form to…….

Answer 5

Conserved
Created
Destroyed
Another

Question 6

Work done =

Answer 6

Energy transferred

Question 7

When a force acts on an object at 90° to the direction it is moving, is any work being done

Answer 7

No

Question 8

The size of the force needed to lift an object is equal to it’s……

Answer 8

Weight, measured in Newtons too

Question 9

What is the equation that links weight, mass and gravity

Answer 9

Weight = mass x gravity

Question 10

What is the gravitational field strength on Earth (GCSE)

Answer 10

10 N/Kg

Question 11

What is power

Answer 11

The rate of work done or the rate of energy transfer

Question 12

What is the equation that links power, time and work done

Answer 12

Work done = power x time

Question 13

What are the units of power

Answer 13

Watts

Question 14

What is the equation that links G.P.E, Mass, Gravity and height

Answer 14

G.P.E = mass x g x height

Question 15

What are the units of G.P.E

Answer 15

Joules (J)

Question 16

What are the units of g

Answer 16

m/s²

Question 17

A 25Kg box slid up a ramp 2m long to a height of 0.8m above the ground, how much potential energy does it gain

Answer 17

25 x 10 x 0.8

= 200J

Question 18

What is the equation that links kinetic energy, mass and speed

Answer 18

Kinetic energy = ½ mass x speed²

Question 19

What are the units of kinetic energy

Answer 19

Joules (J)

Question 20

……lost =…….gained

Answer 20

G.P.E
Kinetic energy
m x g x h = ½ x m x v²