Physics formulas

Question 1

Average speed (m/s)

Answer 1

Total distance (m)/Total time (s)

Question 2

Average velocity (m/s)

Answer 2

Total displacement (m)/Total time (s)

Question 3

Acceleration (m/s^2)

Answer 3

Change in velocity (m/s) / time taken (s)

Question 4

Weight (N)

Answer 4

Mass (kg) x Gravitational field strength (N/kg)

Question 5

Density (kg/m^3)

Answer 5

Mass (kg) / Volume (m^3)

Question 6

Force (N)

Answer 6

Mass (kg) x Acceleration (m/s^2)

Question 7

Hooke’s law

Force (N)

Answer 7

Spring constant (N/m) x Extension (m)

Question 8

Moment (Nm)

Answer 8

Force (N) x Perpendicular distance to the pivot (m)

Question 9

Pressure (N/m^2 also Pa)

Answer 9

Force (N)/Area (m^2)

Question 10

Work done (J)

Answer 10

Force (N) x Distance moved in the direction of the force (m)

Question 11

Kinetic Energy (J)

Answer 11

1/2 x mass (kg) x (velocity (m/s) )^2

Question 12

Gravitational potential energy (J)

Answer 12

Mass (kg) x Acceleration (m/s^2) x change in height (m)

Question 13

Power (W)

Answer 13

Energy transferred (J)/time taken (s)

Question 14

Efficiency

Answer 14

Useful output/input x 100%

Question 15

Wave speed (m/s)

Answer 15

Frequency (hz) x Wavelength (m)

Question 16

Refractive index (n)

Answer 16

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

Question 17

Snells law

Answer 17

sin i / sin r = n

Question 18

Current (amps)

Answer 18

Charge (coulomb) / time

Question 19

Potential difference (volts)

Answer 19

Energy (J) / Charge (coulombs)

Question 20

Resistance (ohms)

Answer 20

Voltage (volts) / Current (amps)