Equations

Question 1

Weight

Answer 1

Weight= mass x gravitational field strength

W=mg

Question 2

Work done

Answer 2

Work done= force x distance

W=fd

Question 3

Force applied to a spring

Answer 3

Spring force= spring constant x extension

F=ke

Question 4

Moment of a force

Answer 4

Moment of a force= force x distance

M=F D

Question 5

Pressure

Answer 5

Pressure= force normal to a surface divide by area of that surface

Question 6

Distance travelled

Answer 6

Distance travelled= speed x time

Question 7

Acceleration

Answer 7

Acceleration= change in velocity over time taken

Question 8

Resultant force

Answer 8

Resultant force= mass x acceleration

Question 9

Momentum

Answer 9

Momentum= mass x velocity

Question 10

Kinetic energy

Answer 10

Kinetic energy= 0.5 x mass x velocity squared

Question 11

Gravitational potential energy

Answer 11

Gpe= mass x gravity x height

Question 12

Power

Answer 12

Power= energy over time

Question 13

Power number 2

Answer 13

Power= work done over time

Question 14

Efficiency

Answer 14

Useful output over total input

Question 15

Efficiency

Answer 15

Useful power output over total power output

Question 16

Wave speed

Answer 16

Wave speed= frequency x wavelength

Question 17

Charge flow

Answer 17

Charge flow= current x time

Question 18

Potential difference

Answer 18

Potential difference= current x resistance

Question 19

Power

Answer 19

Power= potential difference x current

Question 20

Energy transferred

Answer 20

Energy transferred = power x time

Question 21

Energy transferred

Answer 21

Energy transferred= charge flow x potential difference

Question 22

Density

Answer 22

Density= mass over volume