Equations to Know

Question 1

Weight is?

W=

Answer 1

Weight= mass * gravitational field strength

W=mg

Question 2

What is the gravitational field strength on earth?

g=

Answer 2

g=9.8N/kg

Question 3

Force applied to a spring is equal to?

F=

Answer 3

Force= spring constant * extension

F=Ke

Question 4

Acceleration is equal to?

a=

Answer 4

Acceleration= change in velocity/ time

a=∆v/t

Question 5

Momentum is?

p=

Answer 5

Momentum= mass * velocity
p= m v

Question 6

Gravitational potential energy is?

Ep=

Answer 6

(GPE)= mass * gravitational field strength * height
Ep= m g h

Question 7

In terms of work done power is?

P=

Answer 7

Power= work done/time

P=W/t

Question 8

Efficiency is?

Answer 8

Efficiency= useful output/total output

Question 9

Charge flow is?

Q=

Answer 9

Charge flow= current * time

Q= I t

Question 10

In terms of Potential difference power is?

P=

Answer 10

Power= potential difference * current
P= V I

Question 11

In terms of power energy transfer is?

E=

Answer 11

Energy transfer= power * time

E= P t

Question 12

Density is?

p=

Answer 12

Density= mass/ volume
p= m/V

Question 13

Work done is?

W=

Answer 13

Work done= force * distance (in line with force)

W= F s

Question 14

Distance is?

s=

Answer 14

Distance= velocity * time
s= v t

Question 15

Resultant force is?

F=

Answer 15

Resultant force= mass * acceleration

F= m a

Question 16

Kinetic energy is?

Ek=

Answer 16

Kinetic energy= (1/2) * mass * velocity^2

Ek= (1/2) m v^2

Question 17

In terms of energy transfer power is?

P=

Answer 17

Power= energy transfer/time
P= E/t

Question 18

Wave speed is?

v=

Answer 18

Wave speed= frequency * wavelength

v= f λ

Question 19

Potential difference is?

V=

Answer 19

Potential difference= current * resistance

V= I R

Question 20

In terms of current power is?

P=

Answer 20

Power= current^2 * resistance
P= I^2 R

Question 21

In terms of charge flow energy transfer is?

E=

Answer 21

Energy transfer= charge flow * potential difference

E= Q V

Question 22

Pressure is?

p=

Answer 22

Pressure= force/area
P= F/A

Question 23

Moment of a force is?

M=

Answer 23

Moment= force * distance from fulcrum
M= F d