Calculations

Question 1

Weight

Answer 1

Weight = mass X gravitational field strength
N= Kg X N/kg

Question 2

Work done

Answer 2

Work done = force X distance
J= N X M

Question 3

Force applied to a spring

Answer 3

Force applied to a spring= spring constant X extension
N= N/m X M

Question 4

Distance travelled

Answer 4

Distance travelled= speed X time
M=M/s X S

Question 5

Acceleration

Answer 5

………………………………M/s
^
Change in velocity. V
Acceleration=—————————- A=——-
M/s2. Time taken. T
S

Question 6

Resultant force

Answer 6

Resultant force= mass X acceleration
N= Kg X M/s2

Question 7

Momentum

Answer 7

Momentum= mass X velocity
Kgm/s = Kg X M/s

Question 8

Kinetic energy

Answer 8

E= 0.5 X M X V^2

Kinetic energy=0,5 X mass X speed^2

J=0.5 X kg X M/s^2

Question 9

Gravitational potential energy

Answer 9

Gravitational potential energy= mass X gravitational field strength X height

J=Kg X N/kg X M

Question 10

Power (energy transferred)

Answer 10

…………………..J
^
Energy transferred. E
Power=—————————– P=—–
W. Time taken. T
S

Question 11

Power work done

Answer 11

…………………..J
^
Work done. E
Power=—————————– P=—–
W. Time taken. T
S

Question 12

Efficiency (energy transfer)

Answer 12

………………………J
^
Useful output energy
Efficiency=—————————————-
Total input energy transfer
J

Question 13

Efficiency (power)

Answer 13

………………………J
^
Useful power energy
Efficiency=—————————————-
Total power input
J

Question 14

Wave speed

Answer 14

Waved speed = frequency X wavelength
M/s= Hz X M

Question 15

Charge flow

Answer 15

Charge flow= current X time
C = A X S

Question 16

Potential difference

Answer 16

Potential difference = current X resistance
V =A X Ω

Question 17

Power (Potential difference)

Answer 17

Power= Potential difference X current
W = V X A

Question 18

Power (current)

Answer 18

Power = current^2 X resistance
W = A X Ω

Question 19

Energy transferred (transferred power)

Answer 19

Energy transferred= Power X time
J = W X S

Question 20

Energy transferred (transferred charge flow)

Answer 20

Energy transferred = charge flow X potential difference
J = C X V

Question 21

Density

Answer 21

……………….Kg
^
Mass. M
Density = ————- P=——-
Kg/M^3. Volume. V