Equations

Question 1

Weight

Answer 1

Mass x gravitational field strength

Question 2

Work done

Answer 2

Force x distance

Question 3

Force applied to a string

Answer 3

Spring constant x extension

Question 4

Moment of a force

Answer 4

Force x distance

Question 5

Pressure

Answer 5

Force normal to a surface

—

Question 6

Distance travelled

Answer 6

Speed x time

Question 7

Acceleration

Answer 7

Change is velocity

—

Question 8

Resultant force

Answer 8

Mass x acceleration

Question 9

Momentum

Answer 9

Mass x velocity

Question 10

Kinetic energy

Answer 10

0.5 x mass x (speed) ²

Question 11

GPE (gravitational potential energy)

Answer 11

Mass x gravitational field strength x height

Question 12

Efficiency

Answer 12

Useful output energy transfer

—

Question 13

Wave speed

Answer 13

Frequency x wavelength

Question 14

Charge flow

Answer 14

Current x time

Question 15

Potential difference

Answer 15

Current x resistance

Question 16

Power (for PD) (2)

Answer 16

Potential difference x current

OR

(Current) ² x resistance

Question 17

Energy transferred (2)

Answer 17

Power x time

OR

Charge flow x potential difference

Question 18

Power (2)

Answer 18

Energy transferred / work done

—

Question 19

Density

Answer 19

Mass

—