Equations

Question 1

Equation for distance

Answer 1

Distance = speed x time

Question 2

Equation for acceleration

Answer 2

Change in velocity/time

Question 3

Equation for force

Answer 3

Mass x acceleration

Question 4

Equation for weight

Answer 4

Mass x gravitational field strength

Question 5

Equation for Gravitational potential energy

Answer 5

Mass x gravity x change in height

Question 6

Equation for kinetic energy

Answer 6

1/2 x mass x velocity^2

Question 7

Equation for efficiency

Answer 7

Useful energy output/total energy output

Question 8

Equation for wave speed

Answer 8

Frequency x wavelength OR distance/time

Question 9

Equation for work done

Answer 9

Force x distance (moved in the direction of the force)

Question 10

Equation for power

Answer 10

Work done/time OR energy transferred/ time taken

Question 11

Equation for moment of force

Answer 11

Force x perpendicular distance

Question 12

Equation for energy transferred

Answer 12

Charge moved x potential difference

Question 13

Equation for charge

Answer 13

Current x time

Question 14

Equation for voltage (potential difference)

Answer 14

Current x resistance

Question 15

Equation for electrical power

Answer 15

Current x potential difference OR current^2 x resistance

Question 16

Equation for force on spring

Answer 16

Spring constant x extension

Question 17

Equation for pressure

Answer 17

Force/area

Question 18

Equation for force on a conductor

Answer 18

Magnetic flux density x current x length

Question 19

Equation for pressure from liquid

Answer 19

Height of column x density of liquid x gravity

Question 20

Equation for momentum

Answer 20

Mass x velocity

Question 21

Equation for resultant force

Answer 21

Change in momentum/time taken