Science

Question 1

Kinetic energy

Answer 1

1/2 x mass x speed*

Question 2

Resultant force

Answer 2

Mass x acceleration

Question 3

Momentum

Answer 3

Mass x velocity

Question 4

Work done

Answer 4

Force x distance moved

Question 5

Power

ET or WD

Answer 5

Work done / time
Or
Energy transferred / time

Question 6

Efficiency

Answer 6

Useful energy output / total energy input (x100)
Or
Useful power output / total power input (x100)

Question 7

Weight

Answer 7

Mass x gravitational field strength

Question 8

Gravitational potential energy

Answer 8

Mass x height x gravitational field strength

Question 9

Force applied to a spring

Answer 9

Extension x spring constant

Question 10

Distance travelled

Answer 10

Speed x time

Question 11

Acceleration

Answer 11

Change in velocity / time

Question 12

Wave speed

Answer 12

Frequency x wavelength

Question 13

Potential difference

Answer 13

Current x resistance

Question 14

Electrical charge

Answer 14

Current x time

Question 15

Electrical power

Answer 15

Potential difference x current
Or
Current* x resistance

Question 16

Pressure

Answer 16

Force normal to surface / surface area

Question 17

Moment of a force

Answer 17

Force x distance

Question 18

Density

Answer 18

Mass / volume

Question 19

Energy transferred

Answer 19

Charge flow x potential difference

Question 20

Pressure due to column of liquid

Answer 20

Height of column x density of liquid x gfs

Question 21

Force

Answer 21

Change in momentum / time taken

Question 22

Elastic potential energy

Answer 22

0.5 x spring constant x extension*2

Question 23

Change in thermal energy

Answer 23

Mass x specific heat capacity x temperature change

Question 24

Period

Answer 24

1 / frequency

Question 25

Magnification

Answer 25

Image height / object height