Equations

Question 1

Power=

Answer 1

Power= energy transferred/ time

Power=(current)^2 X Resistance

Power=Energy transferred/time

Power= potential difference X current

Question 2

Potential difference=

Answer 2

Potential difference= current X resistance

Question 3

Density=

Answer 3

Density= mass / volume

Question 4

Efficiency=

Answer 4

Efficiency= useful/ total

Question 5

Wave speed=

Answer 5

Wave speed= frequency X wavelength

Question 6

Work done=

Answer 6

Work done= force X distance (along the line of action of the force)

Question 7

Force applied to a spring=

Answer 7

Force applied to a spring= spring constant X extension

Question 8

Charge flow=

Answer 8

Charge flow= current X time

Question 9

Kinetic energy=

Answer 9

Kinetic energy = 0.5 X mass X (Velocity)^2

Question 10

Moment of a force=

Answer 10

Moment of a force= force X distance (normal to direction of force)

Question 11

Momentum=

Answer 11

Momentum = mass X velocity

Question 12

Acceleration=

Answer 12

Acceleration=change in velocity/ time taken

Question 13

Resultant force=

Answer 13

Resultant force= mass X acceleration

Question 14

Weight=

Answer 14

Weight= mass X gravitational field strength

Question 15

Energy transferred=

Answer 15

Energy transferred= charge flow X potential difference

Question 16

Pressure=

Answer 16

Pressure= force normal to a surface/ areas of that surface

Question 17

Distance travelled=

Answer 17

Distance travelled= speed X time

Question 18

Gravitational potential energy =

Answer 18

Gravitational potential energy = mass X gravitational field strength X height