PHYSICS FORMULAS

Question 1

Distance

Answer 1

meters/seconds (ms-1)

Question 2

Speed

Answer 2

distance (m) / time (s) = (m/s)

Question 3

Weight

Answer 3

mass (kg) x gravity (N/kg) = (N)

Question 4

Density

Answer 4

mass (kg) / volume (m3) = (kg/m3)

Question 5

Acceleration

Answer 5

change in velocity\speed / time taken = (m/s²)

Question 6

Pressure

Answer 6

force (N) / area (m2) = (Pa / N/m2)

Question 7

Area

Answer 7

force (N) / pressure (Pa / N/m2)

Question 8

Force (Hooke’s Law)

Answer 8

constant (N/m-1) x extension (m) = (N)

Question 9

Moment

Answer 9

force (N) x distance (m) = (N/m)

Question 10

Efficiency

Answer 10

useful energy output / total energy input x 100

Question 11

Efficiency (II)

Answer 11

useful energy output/total energy output x 100

Question 12

Kinetic Energy

Answer 12

1/2 x mass (kg) x velocity2 (m/s) = (J / KJ)

Question 13

Change in gravitational potential energy

Answer 13

mass (kg) x grav field strength (9.8 / 10 N/kg) x change in height (cm/m) = (J / KJ)

Question 14

Work done

Answer 14

force (N) x distance (cm/m/km) = J KJ)

Question 15

Power

Answer 15

energy (J) / time (s) = (W)

Question 16

Power (II)

Answer 16

work done (J / KJ) / time (s) = (W)

Question 17

Energy

Answer 17

work done (J / KJ) / power input (w) = (J)

Question 18

Pressure in liquid

Answer 18

height (m) x density (kg/m3) x grav field strength = (Pa)

Question 19

Period

Answer 19

1 / frequency (Hz) = (s)

Question 20

Wave speed

Answer 20

frequency (Hz) x wave length (m) = (m/s)

Question 21

Frequency

Answer 21

wave speed (m/s) / wave length (m) = (Hz)

Question 22

Time

Answer 22

distance (m) / speed (m/s)

Question 23

Snell’s Law

Answer 23

sin 1/ sin r

Question 24

Refractive Index

Answer 24

1 / sin c

Question 25

Refracted angle

Answer 25

sin-1(sin r)

Question 26

Refractive Index

Answer 26

Speed of light in a vacuum / speed of light in a medium

Question 27

Refractive Index

Answer 27

sin 1 / sin r

Question 28

Critical Angle

Answer 28

1 / refractive index