What is the equation for Speed, Distance and Time?
Distance= SpeedxTime
How far can a car travel in 60 seconds at 10m/s?
60x10=600m
How fast is a car travelling when it travels 100m in 5 seconds?
100/5=20m/s
How long will it take for a car to travel 150m at 3m/s?
150/3=50 seconds
What is the difference between velocity and speed?
Speed is a scalar quantity which can get bigger
Velocity has direction(Speed in a given direction)
Which axis is time always in?
X
What direction in A travelling in on a velocity graph?
Away from the start
What direction in B travelling in on a velocity graph?
Back to the start
What direction in C travelling in on a velocity graph?
It is not
Which is travelling faster?
A
Describe the velocity graph.
between a and b the object is moving away from the start
between b and c it is stationary
between c and d it is returning to the start
Describe the speed graph.
between a and b the object is accelerating
between b and c the object is moving at a constant speed.
between c and d the object is decelerating
What is the difference between average speed and instantaneous speed.
Average speed is the whole distance over the whole time or over a particular time.
Instantaneous is when the speed over a certain distance and the time it took to travel there e.g. at a particular point
How would you convert seconds to minutes?
/60
How would you convert mins to secs?
x60
How would you convert hours to minutes?
x60
How would you convert minutes to hours?
/60
How do you work out acceleration?
Final velocity - initial velocity
/ Time taken
How do you work out the distance something has travelled on a velocity graph?
Work out the area under the graph by splitting it up into shapes.
How does deceleration differ to acceleration?
It is the same with a -
What are the two situations that can occur when forces are balanced?
When an object is travelling at a constant speed
When an object is at rest(stopped)
What is weight?
A force that acts downwards on an object due to gravitational pull
What is up thrust?
The Upward force
What is drag?
The force acting in the opposite direction to the motion of a moving object
A stone weighing 20N drops with 4N of drag and 2N of upthrust:
a)What is the total upward force
b) the resultant force
c) the direction it is travelling in
a) 4N+2N=6N
b) 20N-6N=14N
c) Downwards
What is 1N the same as?
1 kgm/s^{2}
What is the equation for working out Force, Mass and Acceleration?
Force= Mass x Acceleration
What is the force needed to accelerate a bus 4000kg by 2m/s^{2}?
^{}
4000x2= 8000N
Accleration of a car mass 1000kg force 20000N?
20000/1000=20m/s^{2}
Mass of a car force 15 KN at 10 m/S^{2}?
15000/10=1500KG
Label 1, 2 and 3 with what the force is?
1. Push
2. Weight
3. Friction
What is the relationship between the forces of a stationary object?
They are balanced
What is the point of the centre of gravity must pass for an object to fall over?
the base
What is thinking distance?
the distance you travel before thinking you need to stop.
What is Braking distance?
the distance it takes for the car to physically stop.
How do you work out stopping distance?
Thinking distance + Braking distance
What is the stopping distance at 20mph?
40ft
What is the stopping distance at 30mph?
75ft
What is the stopping distance at 40mph?
120ft
What is the stopping distance at 50mph?
175ft
What is the stopping distance at 60mph?
240ft
What is the stopping distance at 70mph?
315ft
What is the stopping distance at 80mph?
400ft
What is the relationship between distance and velocity?
the greater the velocity the greater the distance
What is the relationship between:
Force and Mass
Force and acceleration
Proportional
Give three things that affect thinking distance.
If the driver is under the influence of drugs or alcohol etc. make it slower
If the driver has had caffeine which could make it faster
If there is a distraction in the car making it slower
Give three things that affect braking distance.
If the road is wet or icy
Mass of the car if it is heavier it will be harder to stop
The condition of the car e.g. worn brakes
What affects both braking and thinking distance?
Speed
What is terminal velocity?
When the forces on an object are equal
What is the equation for working out Mass, Weight and Gravitational field strength?