Triangles

Question 1

Kinetic energy

Answer 1

1/2mass(kg)velocity squared(m/s2)

Question 2

Power(W)

Answer 2

Work(J)/time(s)

Question 3

Distance (m)

Answer 3

Speed (m/s) x Time taken (s)

Question 4

Acceleration m/s2

Answer 4

Change in velocity (v final velocity-initial velocity u) m/s / time taken (s)

Question 5

Weight (Kg)

Answer 5

Mass (N) x gravitational field strength

10 on earth

Question 6

F = resultant force

Answer 6

Mass N X acceleration m/s2

Question 7

Momentum

Answer 7

Mass kg X velocity m/s =kg m/s

Question 8

Force acting N

Answer 8

Change in momentum kg m/s x time taken for change to happen s

Question 9

Moment a moment is the turning effect of a force

Answer 9

Force N X perpendicular distance m between line of action and pivot

Question 10

Equilibrium

Answer 10

Anti-clockwise moment = clockwise moment

Question 11

Orbital speed m/s

Answer 11

2 x pie x orbital radius r / time period T

Question 12

Electrical power P

Answer 12

Current I x voltage v

Question 13

Energy transferred

Answer 13

Current x voltage x time

Question 14

Voltage

Answer 14

Current x resistance

Question 15

Charge q

Answer 15

Current x time

Question 16

Wave speed m/s

Answer 16

Frequency Hz x wavelength m

Question 17

Refractive index n

Answer 17

Sin I / sin r

Question 18

Sin c critical angle

Answer 18

1 / n refractive index

Question 19

Energy efficiency

Answer 19

Useful energy / total energy input

Question 20

Work done (J)

Answer 20

Force (N) x distance moved (m)

Question 21

Power (W)

Answer 21

Work done (J) / Time taken (s)

Question 22

Gravitational Potential energy

Answer 22

Mass (kg) x gravitational field 10 (m/s2) x height (m)

Question 23

Density (kg/m3)

Answer 23

Mass (kg) / volume (m3)

Question 24

Pressure (Pa) = (N/m2)

Answer 24

Force (N) / area (m2)

Question 25

Pressure difference (Pa)

Answer 25

Height (m) x density (kg/m3) x gravitational field

Question 26

What is the equation for a fixed mass of gas at a constant temperature?

Answer 26

p1V1 starting conditions = p2V2 final conditions

Question 27

What is the equation in a sealed container (constant volume)

Temperature must always be in kelvin

Pressure units must stay the same as in question

Answer 27

p1/T1 starting conditions = p2/T2 final conditions

Question 28

Transformer equation

Answer 28

Input (primary) voltage / output (secondary voltage) = number of turns on primary / number of turns on secondary

Question 29

Transformers equation

Answer 29

Voltage (primary) X current (primary) = voltage (secondary) X current (secondary)