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Gravity
OCR Physics A GCE Definitions
Terms in this set (23)
Impulse of a force
Area under a force/time graph. Force x time for which the force acts / duration of collision
Perfectly Elastic Collision
A collision with no change/loss of kinetic energy. Kinetic energy is conserved,
Inelastic Collision
Total energy is conserved though some loss of kinetic energy (during collision). The magnitude of the impulse on each object is the same.
One Radian
The angle where the arc of a circle equals the radius.
Gravitational Field Strength
Force per unit mass (at a point in a gravitational field)
Period
The time taken for the object to describe a complete circle/orbit
Displacement
Is the distance of a body from the equilibrium position and is directed in the opposite direction to the displacement (equilibrium when the resultant force is zero)
Amplitude
Maximum displacement
Frequency
Number of oscillations/cycles per unit time
Angular Frequency
Product of 2π x frequency or 2π/period
Phase Difference
The angle, in radians between subsequent wave peaks
Simple Harmonic Motion
Acceleration is (directly) proportional to displacement (from the equilibrium position) and is always acting towards the equilibrium position.
Pressure Exerted by a Gas
Collisions with surface of large numbers of particles travelling randomly exerts a force (or each collision has a change of momentum)
Internal Energy
The sum of the randomly (distributed) kinetic and potential energies associated with the molecules/atoms of a system
Specific Heat Capacity
Energy required to raise the temperature of a unit mass of a substance by unit temperature rise
Newton
The force which gives a mass of 1kg an acceleration of 1 ms-2
Kilowatt-hour
1kWh is the energy used/provided by a 1 kW device in 1 hour
Newton's First Law
A body will remain at rest or continue to move with constant velocity unless acted upon by a force
Newton's Second Law
Force is proportional to rate of change of momentum
Newton's Third Law
When one body exerts a force upon another, the other body exerts and equal bot opposite force on the first body
Principle of Conservation of Momentum
Total momentum is conserved for a closed system, where no external forces are acting
Newton's law of gravitation
Force between two (point) masses is proportional to the product of masses and inversely proportional to the square of the distance between them.
Boyle's law
Pressure is inversely proportional to volume for a fixed mass of gas at a constant temperature
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