Forces & Motion Flashcards
What is stopping distance?
The distance covered in the time between the driver first spotting a hazard and the car actually stopping.
What is thinking distance?
The distance the car travels in the time between the driver noticing the hazard and applying the breaks.
How does how fast you’re traveling affect the thinking distance?
The faster you’re going, the further you will go until you stop.
What else effects the thinking distance?
How dopey you are- tiredness, drugs, alcohol, old age, carelessness
What is the braking distance?
The distance the car travels during its deceleration whilst the breaks are being applied.
How dos how fast you’re going affect the braking distance?
The faster you’re going, the further it takes to stop.
How does how heavy your vehicle is affect the braking distance?
A heavily laden vehicle takes longer to stop.
What three things does the grip of a car depend on?
Road surface, weather & tyres
What else effects the breaking distance?
How good your breaks are
What does visibility mean for the stopping distance?
Bad visibility means that the drivers do no notice a hazard until they are quite close to it, meaning they have a much shorter distance available to stop in.
Tyres should have a minimum tread depth of ____
1.6 mm
What does stopping distance =
Thinking distance + braking distance
What is acceleration?
How quickly the velocity is changing.
What do flat sections on a VT graph represent?
Steady speed
To keep going at a steady speed, what type of force must there be?
Zero resultant force
Resultant force =
Acceleration
An unbalanced force will always produce…
Acceleration/deceleration
What is a reaction force?
If an object exerts a force on another object, then the other object will exert the exact opposite force back onto the object.
What is gravity?
The force on an object which attracts them towards each other.
When does the gravitational force increase?
- when the masses are bigger.
- when the objects are closer
What is the weight of an object?
The gravitational force between the object and the earth
When does weight change?
When the mass of an object increases.
What happens when an object has no force acting on it?
It slows down and stops moving
What is needed to travel at a steady speed?
A driving force to counteract the friction
Why do object weigh less on the moon?
The moon has less mass than the earth, so it’s Gravity is less than the earths gravity. This means that objects weigh less on the moon than they do on the earth
