5th Yr Summer physics Exam
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27 Terms
Displacement
The distance in a given direction.
Time
The interval between two events measured in seconds.
Velocity
Rate of change of displacement of an object with respect to time.
Acceleration
The rate of change of velocity with respect to time.
Weight
The force exerted on an object by gravity.
Momentum
The product of an objects mass and its velocity.
Newtons Law of universal gravitation
The forces of attraction between two point masses in the universe is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Pressure
The force per unit area acting perpendicular to the surface.
Buoyancy
The force acting upwards on an object placed in a fluid.
Archimedes Principle
A body totally or partially immersed in a fluid is subjected to a force equal in magnitude to the weight of the fluid it displaces.
Energy
The ability to do work.
Work
Is done when a force is applied to an object causing it to move a distance in the direction of that force.
Conservation of Energy
The energy cannot be created nor destroyed but transforms from one form to another.
Power
The rate at which work is done.
Centre of Gravity
A point from which the weight of a body can be considered to act.
Cathode Rays
Beams of electrons emitted from from the cathode of a high vacuum tube.
Thermionic Emission
The emission of electrons from the surface of a hot metal.
Photoelectric Effect
The Emission of electrons when electromagnetic radiation of a suitable frequency hits a material.
X-Rays
Penetrating form of high energy electromagnetic radiation.
Temperature
The measure of the hotness of a body.
Heat
Form of energy that flows from a hotter object to a cooler one.
Specific Heat Capacity
Amount of energy required to heat up 1kg of a substance by 1K.
Specific Latent Heat
Defined as the energy required to change the state of 1kg of a substance without change in temperature.
Thermometric Property
One that measurably changes with a change in temperature.
Current
The amount of charge passing any point in a conductor per second.
Resistance
The opposition to current flow in an electrical circuit.
Ohms Law
Current flowing through a conductor is directly proportional to the potential difference applied across its end provided temperature and physical changes remain the same.