Word Equations

Question 1

Weight

Answer 1

mass x gravitational field strength

Question 2

Gravitational potential energy

Answer 2

mass x gravitational field strength x (change in) height

Question 3

Average speed

Answer 3

distance travelled / time taken

Question 4

The speed of a trolley using a piece of card attached to the top of a trolley and timer connected to a light gate

Answer 4

length of card/
time to pass through the light gate

Question 5

Acceleration (from the motion of an object)

Answer 5

(final VELOCITY-initial VELOCITY)/time

Question 6

Kinetic energy

Answer 6

½ x MASS x speed^2

Question 7

Resultant force (from the motion of an object)

Answer 7

MASS x acceleration

Question 8

Efficiency

Answer 8

useful energy ouput/ total energy input

Question 9

Momentum

Answer 9

mass x VELOCITY

Question 10

Frequency (using time)

Answer 10

number of waves (passing a point) / time

Question 11

Wave speed 1

Answer 11

Wave speed = distance / time

Question 12

Wave speed 2

Answer 12

Wave speed = frequency x wavelength

Question 13

Period of a wave

Answer 13

1/frequency