P1

Question 1

Conservation of energy

Answer 1

Energy is not created or destroyed but merely changes forms

Question 2

What is work

Answer 2

Work is done when an object is moved by a force

Question 3

What does energy transferred equal

Answer 3

Work done

Question 4

How do you find the work done by a force when it causes displacment ?

Answer 4

Work done, W = force applied, F x distance moved along the line of the force, s

Question 5

Whats the equation for gravitational potential energy store

Answer 5

G.P.E = mass, m x gravity, g x change in height, H

Question 6

How to find the kinetic energy store of an object

Answer 6

Kinetic energy, Ek (joules, J) = 1/2 x mass, m (kg) x speed, v2 (m/s)2

Question 7

How to find the elastic potential energy

Answer 7

E.P.E, Ee (joules J) = 1/2 x string constant, k (N/m) x extenstion2, e2 (m2)

Question 8

Useful energy

Answer 8

Energy transferred to where it is wanted in the way that is wanted

Question 9

Wasted energy

Answer 9

Energy that is not usefully transferred

Question 10

Input energy

Answer 10

Energy that is supplied to the device

Question 11

How to calculate efficiency

Answer 11

Efficience = usefyll output energy transferred by the device (J)/total energy to the device (J) x 100

Question 12

What is power ?

Answer 12

The rate at which energy is transferred
Measured in watts W
1W = 1J

Question 13

Whats the equation for power ?

Answer 13

Power, P = Energy (J) / Time (s)