Equations

Question 1

Pressure difference

Answer 1

Height x density x gravity

Question 2

Pressure

Answer 2

Force / area

Question 3

Density

Answer 3

Mass / volume

Question 4

Speed

Answer 4

Distance / time

Question 5

Acceleration

Answer 5

Change in velocity / change in time

Question 6

Kinetic energy

Answer 6

Half x mass x velocity squared

Question 7

G.P.E

Answer 7

Mass x Gravity x Height

Question 8

(Electric) power

Answer 8

Current x Voltage

Question 9

Voltage

Answer 9

Current x Resistance

Question 10

Efficiency

Answer 10

Useful energy / (Total energy) x 100

Question 11

Boyle’s law

Answer 11

P1 V1 = P2 V2

Question 12

Gay Lussac’s Law

Answer 12

P1 / T1 = P2 / T2

Question 13

Force (not pressure)

Answer 13

Mass x Acceleration

Question 14

Charge

Answer 14

Current x Time

Q=IT

Question 15

Wavespeed

Answer 15

Frequency x wavelength

f x λ

Question 16

Law of reflection

Answer 16

Angle of incidence = angle of reflection

Question 17

Refractive index

Answer 17

N = sin i / sin r

sin i = sin angle of incidence, sin r = angle of refraction

Question 18

Total internal reflection: refractive index:

Answer 18

N =1 / sin c

Question 19

Power (w)

Answer 19

P = W / t

Work done/Time

Question 20

Hooke’s law equation

Answer 20

F = kX

Constant x extension

Question 21

Weight

Answer 21

Mass x gravity

Question 22

Final velocity

Answer 22

(Average velocity x2) - initial velocity

Question 23

Work done

Answer 23

Force x distance

Question 24

Kinetic energy gained =

Answer 24

Gravitational potential energy lost

Question 25

Name 2 things that temperature is proportional toKinetic energy
Pressure

Answer 25

Kinetic energy

Pressure

Question 26

Momentum

Answer 26

Mass x velocity

Question 27

Moment

Answer 27

Force x perpendicular disance