🌙 • Lesson 4.1 : Equations Recap

Question 1

Formula to find Weight?

Answer 1

Weight = mass x gravitational field strength
(Grav. Field strength on earth = 10N/kg)

Question 2

Formula to find Force?

Answer 2

Force = mass x acceleration

Question 3

Formula to find Mass?

Answer 3

Mass = density x volume

Question 4

Formula to find Force?
(Hooke’s Law)

Answer 4

Force = spring constant x extension

Question 5

Formula to find Force?

Answer 5

Force = pressure x area

Question 6

Formula to find Distance?

Answer 6

Distance = average speed x time

Question 7

Formula for Acceleration?

Answer 7

Acceleration = (end speed - start speed)/time taken
(Acceleration of free-fall on earth = 10m/s²

Question 8

Formula to find GPE?

Answer 8

GPE = mass x gravitational field strength x height

Question 9

Formula to find Kinetic Energy?

Answer 9

Kinetic Energy = 1/2 x mass x (velocity)²

Question 10

Formula to find useful energy output?

Answer 10

Useful energy output = total energy input x efficiency
(Efficiency as a decimal)

Question 11

Formula to find work done?

Answer 11

Work done = force x distance

Question 12

Formula to find Energy?

Answer 12

Energy = power x time

Question 13

Formula to find Energy Input?

Answer 13

Energy input = mass x specific heat capacity x temperature rise

Question 14

Formula to find Speed?

Answer 14

Speed = frequency x wavelength

Question 15

Formula to find Charge?

Answer 15

Charge = current x time

Question 16

Formula to find Voltage?
(Potential difference)

Answer 16

Voltage = current x resistance

Question 17

Formula to find Power?

Answer 17

Power = current x voltage