# p3

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what is speed measured in?
m/s, km/h, mph
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what can you work out if you know the distance an object travels and the time the object takes to travel the distance?
the speed of a moving object
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what is the formula to find out the speed of an object?
speed = distance travelled / time taken
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how do speed cameras work?
they take 2 photos a certain time apart and they then use the photos to calculate the vehicles speed
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what is the equation to find out the speed of car using a speed camera?
speed of car = distance travelled between pictures / time taken between first and second picture
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if the gradient on a distance time graph has a steep slope what does it mean?
the speed is high
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what is acceleration of a moving object measured in?
m/s2 (metres per second squared)
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what is the equation to work out acceleration?
acceleration = change in speed / time taken for change
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if 2 cyclists biked opposite ways at 4m/s each way, what is the relative speed?
8 m/s
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if 2 cyclists biked the same way and one was biking at 6 m/s and one was biking 4 m/s what is the relative speed?
2 m/s
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what are forces measured in?
newtons
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if an unbalanced force is applied to an object it will dpend on ....
the force applied, the mass of an object
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if 2 trolleys are being pushed but one has a larger mass, which torlley would need more force applied to it?
the trolley with the larger mass
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what is the equation to work out stopping distances?
stopping distances = thinking distance + braking distance
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how is thinking distance be increased in a car etc?
travelling faster, driver is ill or under the influence, driver is distracted
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how is braking distance increased in a cer etc??
vehicle is travelling faster, poor weather, bad road conditions, brakes are worn or flat tyres
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braking and thinking distance is increased at faster speeds, what do road safety regulations advise?
obey safety limits, keep distance from car infront, drive slower in bad road/weather conditions
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what is the equation for work done?
work done = force applied x distance moved in direction of force
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work is done when ....
a force moves an object
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what does the amount of work depend on?
size of the force and the distance the object has moved in metres.
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what is power and what is it measured in?
power is how quickly work is done and is measured in watts
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what are the 2 componments to high fuel consumption?
expensive to the driver and damaging to the environment
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what is kinetic energy?
is the energy of an object has because of its movement
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what does kinetic energy depend on?
its mass and its speed
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which is true ........ a)car moving with greater kinetic energy will have a greater breaking distance b)cars ances with greater kinetic energy have smaller breaking dist
a
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what is the formula for calculating kinetic energy?
kinetic energy = 1/2 x mass x speed 2 (
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other than petrol or diesel, what else can fuel a car?
electricity, ie-battery power or solar power
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why is the alternative to petrol and diesel more effective for the enviroment?
it doesnt pollute when in use but the pack that charges the car does pollute.
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what does car fuel consumption depend on?
energy required to increase kinetic energy, energy required to work against friction
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what forces what act against the movement of an object? how can they be reduced?
drag, friction, air resistance changing shape of object,using lubricant to help object slide through air
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what are the safety aspects to cars that take in energy from a collision?
seatbelts, air bags, crumple zone, collapsible steering column
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how do safety features in a car work?
they work by changing shape to absorb energy
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what doe ABS stand for? what is it?
Anti-lock Braking System, which prevents tyres from skidding
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what is traction control?
prevents car from skidding while accelerating
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how can you calculate momentum?
momentum = mass x velocity
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is it ... a)the quickest change in momentum means greater force experienced. OR b)the slowest change in momentum means the greatest force felt.
a
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what is the calculation for force?
Force = change in momentum / time taken
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How can the stopping forces in a collision be reduced?
increasing stopping or collision time OR increasing the stopping or collsion distance
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what two parts of a skydive can be considered when trying to calculate the the speed of the decent?
before the parachute opens and after the parachute opens
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is this TRUE or FALSE?........... at higher speeds falling objects experience less drag
FALSE, at higher speeds falling objects experience more drag
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when does termimal speed occur?
it occurs when the drag is equal to the weight of the objects
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what does this sentence describe?......... the speed isnt changing so the kinetic energy doesnt increase
terminal speed
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what is the difference between weight and mass?
weight is due to force of gravity on an object and mass is the amount f matter that it contains.
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what is gravitational potential energy?
energy stored due to the position in the earths gravitational field and its mass
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what is the equation to calculate GPE?
gravitational potential energy = mass x gravitational field strength x vertical height
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when an object falls it converts ........
gravitational potential energy into kinetic energy
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if the mass of a rollercaoster car is doubled what else is also doubled?
kinetic energy
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if the speed of the car is doubled what is quadrupled?
kinetic energy
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## Other cards in this set

### Card 2

#### Front

what can you work out if you know the distance an object travels and the time the object takes to travel the distance?

#### Back

the speed of a moving object

### Card 3

#### Front

what is the formula to find out the speed of an object?

### Card 4

#### Front

how do speed cameras work?

### Card 5

#### Front

what is the equation to find out the speed of car using a speed camera?