# Motion , energy , electricity

Flash cards with questions and answers.

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What is speed ?
How fast you are going
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What is velocity ?
How fast you are going and direction
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What is gradient equal to ?
Speed
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What does each part of a distance time graph show ?
Flat - stationary , Straight up - steady speed , Steep - fast , Downhill - going back , Levelling off - slowing down
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What is acceleration ?
How quickly velocity is changing
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What is the gravitational force ?
The force of attraction between all masses
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What is weight measured in ?
Newtons
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what is the resultant force ?
The overall force on a point or object
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Wha does resultant force mean ?
A change in velocity
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What will happen if the resultant force on a stationary object is 0 ?
It will remain stationary
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What will happen if there is no resultant force ?
It will carry on moving
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What are reaction forces ?
Equal and opposite
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What does friction do ?
Slows things down
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What does drag do ?
Increases the speed
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What will reach a terminal velocity ?
Objects falling through fluids
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What does the terminal velocity depend on ?
Shape and area
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What is thinking distance ?
The distance the vehicle travels during the drivers reaction time
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What factors affect thinking distance ?
How fast you are going , tiredness , drugs
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What is Braking distance ?
The distance the car travels under the braking force
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What factors affect braking distance ?
How fast your going , Quality of brakes , Quality of tyres , Quality of grip
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When is work done ?
When a force moves an object through a distance , energy is transferred and work is done
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What is gravitational potential energy ?
Energy due to height
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What is kinetic energy ?
The energy of movement
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What does kinetic energy gained equal ?
Potential energy lost
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What do falling objects convert Ep into ?
Ek
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What is the extension of an object ?
It is directly proportional to force
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What is power ?
The rate of doing work
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What is power measured in ?
Watts
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What does momentum before equal ?
Momentum after
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What do forces cause ?
A change in momentum
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What are cars designed to do ?
Convert kinetic energy safely in a crash
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What does the size of a car engine determine ?
How powerful the car is
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What do air bags do ?
Slow you down gradually to prevent you hitting hard surfaces in a crash
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What does friction cause ?
A build up of static
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What do likes and opposites do ?
Repel and attract
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Can charges move easily through conductors ?
Yes
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What does the total charge through a circuit depend on ?
Current and time
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The greater the resistance across a component the .....
Smaller the current that flows
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What does an Ammeter do ?
Measures the current
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What does a voltmeter do ?
Measures the potential difference
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Resistance increases with ......
Temperature
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Does current only flow in one direction through a diode ?
Yes
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What does an Light emitting diode do ?
Emits light when a current flows through it in a forward direction
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What is an LDR dependant on ?
Light
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What is a thermistor dependant on ?
Temperature
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In a series circuit is the potential difference shared ?
Yes
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What is the current in a series circuit ?
The same everywhere
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In a parallel circuit what is the current shared between ?
Branches
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What is the P.D in a parallel circuit ?
The same for all components
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Give an example of a series circuit ?
Fairy lights
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Give an example of a parallel circuit ?
Everything in a car
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## Other cards in this set

### Card 2

#### Front

What is velocity ?

#### Back

How fast you are going and direction

### Card 3

#### Front

What is gradient equal to ?

### Card 4

#### Front

What does each part of a distance time graph show ?

### Card 5

#### Front

What is acceleration ?