Paper 1 Equations

Question 1

Calculating the work done by a force when it causes displacement of an object, use this equation……

Answer 1

Work Done (Joules, J) = 
Force Applied (Newtons, N) x 
distance moved along the line of action of the force (Metres, m)

Question 2

Equation working out kinetic energy

Answer 2

Kinetic Energy (Joules, J) = 0.5 x mass (Kg) x speed (m/s2)

Question 3

Equation for gravitational potential energy

Answer 3

Change in Gravitational Energy store (Joules, J)

Mass (Kg) x Gravitational field strength (N/kg) x change in height (Metres, m)

Question 4

Efficiency Equation

Answer 4

Useful Output Energy (Joules, J) / Total Input Energy (Joules, J)

Question 5

Equation of electric current of a circuit is….

Answer 5

Current (Amps,A) = Charge Flow (Coulombs,C) x time taken (Seconds, s)

Question 6

Resistance of an electrical component is defined as…

Answer 6

Resistance (Ohms) = P.d (Volts, V) / Current (Amps, A)

Question 7

P.d across a components….

Answer 7

Potential Difference (Volts,V) = Energy Transferred (Joules) / Charge

Question 8

Equation relating power, current and p.d

Answer 8

Power Supplied (Watts,W) = Current (Amps,A) x Potential Difference (Volts,V)

Question 9

Equation relating power current and resistance

Answer 9

Power (Watts, W) = Current2 (Amps, A) x Resistance (Ohms)

Question 10

Equation relating charge flow, p.d and energy transferred

Answer 10

Charge Flow (Coulombs,C) = Energy Transferred (J) x p.d (V)

Question 11

Equation relating power work done and time

Answer 11

Power (Watts) = Work done or energy (J) / Time (sec)

Question 12

Equation relating density mass and volume

Answer 12

Density (kg/m3) = Mass (kg) /volume (m3)