Equations

Question 1

Kinetic energy

Answer 1

1/2 x mass x speed²

1/2mv²

Question 2

GPE (gravitational field strength)

Answer 2

mass x gravitational field strength x height

mgh

Question 3

Power (1)

Answer 3

work done/time taken

Question 4

Power (2)

Answer 4

energy transferred/time taken

Question 5

Efficiency (1)

Answer 5

useful energy output/total energy input

Question 6

Efficiency (2)

Answer 6

useful power output/total power input

Question 7

Charge flow

Answer 7

Current x time

Q=I x t

Question 8

Potential difference

Answer 8

Current x resistance

V=I x r

Question 9

Power (3)

Answer 9

Current x potential difference

P= I x V

Question 10

Power (4)

Answer 10

(current)² x resistance

Question 11

Energy transferred

Answer 11

Power x time

E=P x t

Question 12

Energy transferred

Answer 12

Charge flow x potential difference

E = Q x V

Question 13

Density

Answer 13

Mass/volume

Question 14

Wave speed

Answer 14

Frequency x wave length

Question 15

Weight

Answer 15

Mass x gravitational field strength

Question 16

Work done

Answer 16

Force x distance (moved along the line of action of the force)

Question 17

Force

Answer 17

Spring constant x extension

Question 18

Moment of a force

Answer 18

Force x distance (perpendicular to the direction of the force)

Question 19

Pressure

Answer 19

Force normal to a surface/area of that surface

Question 20

Distance travelled

Answer 20

Speed x time

Question 21

Acceleration (1)

Answer 21

Change in velocity/time taken

Question 22

Acceleration (2)

Answer 22

Final velocity-initial velocity/time taken

Question 23

Resultant force

Answer 23

Mass x acceleration

Question 24

Momentum

Answer 24

Mass x velocity