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Science
Physics
PHYSICS Y10 IGCSE SYLLABUS
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Terms in this set (45)
Power current voltage equation
P=IxV
Energy transferred equation
energy transferred = current x voltage x time
E = I x V x t
Difference between alternating current and direct current
Mains electricity being alternating current is (a.c.) and direct current (d.c.) being supplied by a cell or battery
speed equation
Average speed = distance moved/time taken
Acceleration
Acceleration = change in velocity/time taken
A = (v-u)/t
Equation for final speed
V(squared) = u(squared) + (2 x a x s)
(Final speed) squared = (initial speed)squared + (2 x acceleration x distance moved)
Equation for force
F = m x a
Equation for weight
W = m x g
Equation for momentum
p = m x v
Equation for force , change in momentum and time taken
Force = change in momentum/time taken
F = (mv-mu)/t
Equation for voltage
Voltage = current x resistance
V = I x R
Equation for charge
Charge = current x time
Q = I x t
Equation for energy transferred
E = Q x V
Energy transferred = charge x voltage
Equation for work done
Work done = force x distance
W = F x d
Work done is equal to energy transferred
Equation for gravitational Potential energy
GPE=mgh
GPE = mass x gravitational field strength x height
equation for kinetic energy
KE = 1/2 x m x v(squared)
Equation for power ,work done, time taken
Power = work done / time taken
P = W/t
Describe power
Is the rate of transfer of energy or rate of doing work
Describe current
Is the rate of flow of charge
What can lamps and LEDs do
Can be used to indicate the presence of a current in a circuit
Know that electric current in a solid metallic conductors is a flow of negatively charged electrons
Know that voltage across two components connected in parallel is the same
What is voltage?
Voltage is the energy transferred per unit charge passed
The volt is a Joule per coulomb
What is stopping distance?
The stopping distance of a vehicle is made up of the sum of the thinking distance and breaking distance
What is friction?
Friction is a force that opposes motion
Velocity time graph to find acceleration
Gradient
Velocity time graph to find distance
Distance travelled equals area under the graph
What is a scalar quantity?
Scalars are variables which have magnitude only
What is a vector?
Vectors are variables which have magnitude and direction
Vector and Scalar examples
Vector: force
Scalar : mass
Factors affecting vehicle stopping distance
speed, mass, road condition, reaction time
What if more than one force acts?
If a force is acting on an object are balanced than it will change its motion. If it is stationery it will remain so. If it is moving it will continue to move at the same speed and in the same direction
Describe elastic behaviour
Is the Ability of a material to recover its original shape after the forces causing deformation have been removed
Types of forces
Upthrust
Drag or resistance
Friction
Weight (gravitational)
Electrostatic
Tension
Normal reaction
Magnetic
Consevation of momentum
When two or more body's act of each other there total momentum remains constant, providing there is no external force acting
Safety features of momentum
During a collision there will be a change in momentum. This could be a large F for a small t or small f for a large T. In order to make f small we have crumple zones on cars, padded safety helmets and seatbelts which stretch a little
Newton's third law
Newton notice that forces occur in pairs and he called them the action and the friction.
The action force and the reaction force are equal and opposite
Circuit breakers
They protect the circuit from damage if too much current flows
Earthing
Reduces electrical shocks
Insulation & double insulation
Reduces electric shocks
Current in a series circuit
Current is the same throughout the series circuit
Current in a parallel circuit
It branches. If there are the same number of bulbs in both branches, the current splits equally
refuelling aircraft
As aircraft fly through air, friction causes them to become charged with static electricity. When it's landed there is a possibility of charges escaping to earth as a spark or flash of electricity. If it takes place during refuelling it can cause an explosion. The solution to this problem is to earth the Plane with a conductor as soon as it lands and before refuelling , allowing the charge that has built up to flow on the earth
What does a current in a resistor result in
Results in the electrical transfer of energy and an increase in temperature
Resistance equation (ohm's law)
R=V/I
V=I
I=V/R
What is resistance / voltage / current measured in?
Ohms (Ω)
Voltage is (V)
Amps in (a)
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