# p3

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- Created by: BeaFarrell
- Created on: 23-03-16 18:47

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?

#### Back

### Card 4

#### Front

how do speed cameras work?

#### Back

### Card 5

#### Front

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

#### Back

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