forces Flashcards
(6 cards)
1
Q
Explain why the car has a maximum speed
A
- there is a maximum forward force provided by motor
- as the speed of the car increases, air resistance increases
- until air resistance is equal in size to maximum forward force
- so no resultant force
- so car no longer accelerates
2
Q
how to increase moment
A
- increase size of force
- apply force further away from the pivot
3
Q
Explain why the temperature of the brakes increases as they are used
A
- work is done due to friction in the brakes
- causing an increase in thermal energy
4
Q
How does Newton’s Third Law of motion apply to the collision between the bumper car and the barrier?
A
- force of car on barrier is equal and to force of barrier on car and in the opposite direction
5
Q
how to safety momentum things work
A
- increase time taken for collision to occur
- so rate of change of momentum decreases
- reducing the force on people
6
Q
Explain why the driver’s reaction time affects the thinking distance of a car
A
- distance is speed times time
- so longer reaction time equals longer distance
