# EDEXCEL GCSE 9-1 COMBINED SCIENCE FOUNDATION PHYSICS PAPER 1 PART 2

• Created by: jordanb-h
• Created on: 31-03-18 12:30
What does Newton's third law relate to?
bodies in equilibrium and can be applied to collisions when considering the conservation of momentum
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What does Newton's third law state?
that for every action there is an equal and opposite reaction
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The action force and the reaction force act on what?
different bodies
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What is human reaction time?
is the time between a stimulus occurring and a response
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State the time it takes a typical person to react to a stimulus
between 0.20 s and 0.25 s
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How do you calculate reaction time?
reaction time= square root of 2 x distance ruler falls divided by gravitational field strength
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What is the stopping distance?
is the total distance over which a vehicle comes to rest
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What is the thinking distance?
the distance the car travels while the driver reacts to the danger and applies the brakes
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What is the braking distance?
the distance the car travels while it is slowing down, once the brakes have been applied
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How do you calculate the stopping distance?
add the thinking distance and the braking distance to calculate the stopping distance
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When does the thinking distance increase?
when the driver's reaction time increases
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State a factor affecting a driver's thinking distance
the driver being tired
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State a factor affecting a driver's thinking distance
the driver being distracted
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State a factor affecting a driver's thinking distance
the driver having taken alcohol or drugs
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State when braking distance increases
when the amount of friction between the tyres and road decreases, such as when the road is icy or wet
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State when braking distance increases
when the brakes are worn
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State when braking distance increases
when the tyres are worn
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State when braking distance increases
when the mass of the car is bigger
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State one energy store
chemical
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State one energy store
kinetic
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State one energy store
gravitational potential
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State one energy store
elastic
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State one energy store
thermal
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State one energy store
magnetic
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State one energy store
electrostatic
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State one energy store
nuclear
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State an example of a chemical energy store
fuel, food and batteries
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State an example of kinetic energy store
moving objects
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State an example of gravitational potential energy store
raised mass
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State an example of elastic energy store
stretched spring
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State an example of thermal energy store
hot object
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State an example of magnetic energy store
two magnets
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State an example of electrostatic energy store
two charges
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State an example of nuclear energy store
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State one way how energy is transferred from one store to another
mechanically- by a force moving through a distance
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State one way how energy is transferred from one store to another
electrically- by the use of electric current
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State one way how energy is transferred from one store to another
thermally- because of a difference in temperature
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State one way how energy is transferred from one store to another
by radiation- by waves such as electromagnetic or sound
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When there are energy transfers in a closed system there is no what?
net change to the total energy in the system
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What is a closed system?
is where energy can flow in or out of the system but there is no transfer of mass
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When do mechanical processes become wasteful?
when they lead to a rise in temperature of the surroundings through heating
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What is the efficiency of a device?
is a measure of how much useful energy it transfers
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State one thing that the rate at which thermal energy is transferred through a wall of a house depends on
the difference in temperature between the warmer interior and the colder exterior
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State one thing that the rate at which thermal energy is transferred through a wall of a house depends on
the thickness of the walls
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State one thing that the rate at which thermal energy is transferred through a wall of a house depends on
the material that the walls are made from
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What is the efficiency of a machine?
is a way of saying how good it is at transferring energy into useful forms
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How do you calculate efficiency?
efficiency= useful energy supplied by the machine divided by the total energy supplied to the machine multiplied by 100
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What do most machines waste energy as?
heat energy
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How can unwanted energy transfers be reduced?
by thermal insulation and lubrication
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What does lubrication involve?
placing a liquid between moving parts to reduce friction and this leads to less energy being wasted as thermal energy to the surroundings
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Renewable energy resources will not?
run out
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Non-renewable energy resources are what?
available all the time
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## Other cards in this set

### Card 2

#### Front

What does Newton's third law state?

#### Back

that for every action there is an equal and opposite reaction

### Card 3

#### Front

The action force and the reaction force act on what?

### Card 4

#### Front

What is human reaction time?

### Card 5

#### Front

State the time it takes a typical person to react to a stimulus