Equations

Question 1

Distance travelled

Answer 1

Average speed x time

Question 2

Acceleration

Answer 2

Change in velocity ÷ time taken

Question 3

Force

Answer 3

Mass x acceleration

Question 4

Weight

Answer 4

Mass x gravitational field strength

Question 5

Efficiency

Answer 5

Useful energy transferred by device ÷ total energyvsupplied to the device

Question 6

MOMENTUM

Answer 6

MASS X VELOCITY

Question 7

Wave speed

Answer 7

Frequency x wave length

Question 8

Wave speed

Answer 8

Distance ÷ time

Question 9

Density

Answer 9

Mass ÷ volume

Question 10

Work done

Answer 10

Force x distance moved in direction of the force

Question 11

Change in gravitational potential energy

Answer 11

Mass X gravitational field strength x change in vertical height

Question 12

Kinetic energy

Answer 12

0.5 x MASS X (speed)squared

Question 13

Power

Answer 13

Work done ÷ time taken

Question 14

Energy transferred

Answer 14

charge moved x potential difference

Question 15

Charge

Answer 15

Current x time

Question 16

Potential difference

Answer 16

Current x resistance

Question 17

Power

Answer 17

Energy transferred ÷ time taken

Question 18

electrical power

Answer 18

current x potential difference

Question 19

electrical power

Answer 19

current squared x resistance

Question 20

force exerted on a spring

Answer 20

spring constant x extension