PHYSICS GCSE EXAM 2025 SPRING- SUMMER
QUESTIONS AND ANSWERS GRADED A+
What is gravitational potential energy?
it is energy that an object has depending on its height, the work done against the
force of gravity
What is the conservation of energy?
Energy cannot be created or destroyed, only transferred
What is a closed system?
A system where neither matter nor energy can enter or leave
What is work done?
energy transferred when a force moves an object
What is the formula for work done?
Work done (J) = Force (N) X displacement in the force's direction (m).
W = Fs
,How is the work done to overcome friction transferred?
as thermal energy
What is the formula for gravitational potential energy?
Gravitational potential energy (j) = mass (kg) X gravitational field strength (N/kg)
X height (m)
E = mgh
What is the formula for CHANGE in gravitational potential energy?
ΔE = mgΔh
Change in energy (J) = mass (kg) X gravitational field strength (N/kg) X change in
height (m)
What is the formula for kinetic energy?
KE = 1/2mv^2
Kinetic energy (J) = 1/2 X mass (kg) X velocity(m/s)^2
,What is kinetic energy store?
the energy inside a moving object
What is elastic potential energy?
energy stored in an elastic object when work is done on it to change its shape
What is the formula for elastic potential energy?
PE = 1/2ke^2
Potential energy = 1/2 X spring constant (N/m) X extension (m)^2
What is useful and wasted energy?
Useful energy - energy transferred to where it is needed for its purpose
Wasted energy - the excess energy that isn't usefully transferred, usually to the
surroundings as heat from friction
What is efficiency?
useful energy transferred as an output / total energy inputted
No energy can be more than 100% efficient
, How can machines be made more efficient?
lubricate moving parts to reduce friction
use wires with as little resistance as possible
streamline the shapes of objects to make them more aero/hydrodynamic
tighten loose parts to reduce vibration
What is power?
the rate at which energy is transferred/work is done
What is the formula for power?
P = W/t
Power (W) = work (J) / time (s)
What is wasted power?
total power in - useful power out
What are conductors and insulators?
QUESTIONS AND ANSWERS GRADED A+
What is gravitational potential energy?
it is energy that an object has depending on its height, the work done against the
force of gravity
What is the conservation of energy?
Energy cannot be created or destroyed, only transferred
What is a closed system?
A system where neither matter nor energy can enter or leave
What is work done?
energy transferred when a force moves an object
What is the formula for work done?
Work done (J) = Force (N) X displacement in the force's direction (m).
W = Fs
,How is the work done to overcome friction transferred?
as thermal energy
What is the formula for gravitational potential energy?
Gravitational potential energy (j) = mass (kg) X gravitational field strength (N/kg)
X height (m)
E = mgh
What is the formula for CHANGE in gravitational potential energy?
ΔE = mgΔh
Change in energy (J) = mass (kg) X gravitational field strength (N/kg) X change in
height (m)
What is the formula for kinetic energy?
KE = 1/2mv^2
Kinetic energy (J) = 1/2 X mass (kg) X velocity(m/s)^2
,What is kinetic energy store?
the energy inside a moving object
What is elastic potential energy?
energy stored in an elastic object when work is done on it to change its shape
What is the formula for elastic potential energy?
PE = 1/2ke^2
Potential energy = 1/2 X spring constant (N/m) X extension (m)^2
What is useful and wasted energy?
Useful energy - energy transferred to where it is needed for its purpose
Wasted energy - the excess energy that isn't usefully transferred, usually to the
surroundings as heat from friction
What is efficiency?
useful energy transferred as an output / total energy inputted
No energy can be more than 100% efficient
, How can machines be made more efficient?
lubricate moving parts to reduce friction
use wires with as little resistance as possible
streamline the shapes of objects to make them more aero/hydrodynamic
tighten loose parts to reduce vibration
What is power?
the rate at which energy is transferred/work is done
What is the formula for power?
P = W/t
Power (W) = work (J) / time (s)
What is wasted power?
total power in - useful power out
What are conductors and insulators?
