AQA Physics LATEST UPDATE
What is the equation for kinetic energy? Give SI units for all quantities involved.
½ m v²
½ x Mass x (Velocity)²
Energy (J), Mass(kg), Velocity(m/s)
What is the equation for elastic potential energy? Give SI units for all quantities
involved.
½ k x²
½ x Spring Constant x (Extension)²
Energy (J), Spring Constant (N/m), Extension(m)
What is the equation for gravity potential energy? Give SI units for all quantities
involved.
mgh
Mass x Gravitational Field Strength x Height
Energy (J), Mass(kg), Gravitational Field Strength (N/kg), Height (m)
Define the 'Specific Heat Capacity' of a substance.
The amount of energy needed to raise the temperature of 1 kilogram of a substance by
1 degree Celsius.
State the units for Specific Heat Capacity
J/°C/kg
Joules/Degree Celsius/Kilogram
What is the definition of 'Power'?
, The rate at which energy is transferred (or rate at which work is done).
State two equations for power. Give SI units for all quantities involved.
power = energy transferred/time
power = work done/time
Energy (J), Work Done (J), Time (s)
What is the unit of power?
Watt (W)
Two motors lift the same mass through the same height. Motor A does this in half
the time of Motor B. Which dissipates the most power?
Motor A.
The energy transferred is the same but the time taken is less (P=E/t).
Describe the energy changes involved when a ball is thrown upwards and then
returns to its starting position. Ignore air resistance.
● Upwards: KE is converted to GPE
● Peak: Maximum GPE, zero KE
● Downwards: GPE is converted to KE
KE (Kinetic Energy), GPE (Gravitational Potential Energy)
Describe the energy transfers for a bungee jumper.
● When falling, the GPE is converted to KE of jumper
● As the cord tightens, KE is converted and stored as Elastic Potential Energy (EPE)
● At lowest point, the jumper's initial GPE equals the EPE stored in the cord
Explain why a bungee jumper slows down once the cord begins to stretch.
What is the equation for kinetic energy? Give SI units for all quantities involved.
½ m v²
½ x Mass x (Velocity)²
Energy (J), Mass(kg), Velocity(m/s)
What is the equation for elastic potential energy? Give SI units for all quantities
involved.
½ k x²
½ x Spring Constant x (Extension)²
Energy (J), Spring Constant (N/m), Extension(m)
What is the equation for gravity potential energy? Give SI units for all quantities
involved.
mgh
Mass x Gravitational Field Strength x Height
Energy (J), Mass(kg), Gravitational Field Strength (N/kg), Height (m)
Define the 'Specific Heat Capacity' of a substance.
The amount of energy needed to raise the temperature of 1 kilogram of a substance by
1 degree Celsius.
State the units for Specific Heat Capacity
J/°C/kg
Joules/Degree Celsius/Kilogram
What is the definition of 'Power'?
, The rate at which energy is transferred (or rate at which work is done).
State two equations for power. Give SI units for all quantities involved.
power = energy transferred/time
power = work done/time
Energy (J), Work Done (J), Time (s)
What is the unit of power?
Watt (W)
Two motors lift the same mass through the same height. Motor A does this in half
the time of Motor B. Which dissipates the most power?
Motor A.
The energy transferred is the same but the time taken is less (P=E/t).
Describe the energy changes involved when a ball is thrown upwards and then
returns to its starting position. Ignore air resistance.
● Upwards: KE is converted to GPE
● Peak: Maximum GPE, zero KE
● Downwards: GPE is converted to KE
KE (Kinetic Energy), GPE (Gravitational Potential Energy)
Describe the energy transfers for a bungee jumper.
● When falling, the GPE is converted to KE of jumper
● As the cord tightens, KE is converted and stored as Elastic Potential Energy (EPE)
● At lowest point, the jumper's initial GPE equals the EPE stored in the cord
Explain why a bungee jumper slows down once the cord begins to stretch.
