Equations

Question 1

Work Done (energy transferred)

Answer 1

Force applied x Distance

Question 2

Change in objects gravitational potential energy store

Answer 2

Weight x change in height

Question 3

Change of gravitational potential energy store

Answer 3

Mass x gravitational field strength (9.8) x change in height

Question 4

Kinetic energy

Answer 4

1/2 x mass x speed^2

Question 5

Elastic potential energy

Answer 5

1/2 x spring constant x extension

Question 6

Efficiency

Answer 6

Useful output energy transferred by device / total outpt energy tansferred by device

Question 7

Power

Answer 7

Energy transferred / time taken

Question 8

Efficiency (%)

Answer 8

Useful power out / useful power in (x100)

Question 9

Total power wasted

Answer 9

Total power in - useful power out

Question 10

Speed

Answer 10

Distance / time

Question 11

Acceleration

Answer 11

Change in velocity / time taken for change

Question 12

Gradient of a line

Answer 12

Height of triangle / base of triangle

Question 13

Resultant force

Answer 13

Mass x acceleration

Question 14

Weight

Answer 14

Mass x gravitational field strenght

Question 15

Stopping distance

Answer 15

Think distance + braking distance

Question 16

Momentum of an object

Answer 16

Mass x velocity

Question 17

Force applied

Answer 17

Spring constant x extension