Topic 5d- Car safety and momentum Flashcards
1
Q
What is stopping distance equal to?
A
thinking distance + braking distance
2
Q
What four main factors affect breaking distance?
A
- speed that the car is going at
- how good the brakes are
- how good the tyres are
- the state of the road
3
Q
How would you test reaction times
A
ruler drop test (like in bio)
4
Q
How would u estimate the braking force?
A
- Calculate the decelleration of the car
- Use F=ma to calculate the force that the car was travelling
5
Q
What is momentum?
A
A vector quantity that links the mass of an object to its velocity
5
Q
What is the correlation between mass and velocity?
A
The greater the mass of an object, the greater its velocity
5
Q
What safety features do cars have in case of sudden change of momentum
A
- crumple zones
- seat belts
- air bags
6
Q
What does a change in velocity also mean?
A
A change in momentum
