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6. Which of the following does NOT explain how air bags reduce the force on the driver in a crash?
- Slows down the acceleration
- Increases stopping time
- Greater time for Kinetic energy to be dissipated
- Increases speed of collision
- Increases stopping distance
7. The air bags in a car absorb kinetic energy when a crash occurs.
8. Which of these factors does NOT increase fuel consumption?
- Driving at higher speeds
- Increased loads
- Driving straight
- Air conditioning
- Braking hard
9. When an object is dropped why does its speed increase until it reaches terminal speed?
- There is no gravity acting on it
- The weight of the object is greater than the drag/air resistance acting against it
- The drag/air resistance acting against it is equal to its weight
- It has a lot of energy
- The drag/air resistance is greater than the object
10. In a speed-time graph what can be calculated from the area from the area under the line?
- Mass
- Distance travelled
- Accerelation
- Speed
- Age
11. Which of these is NOT a reason why crumple zones reduce the force on a driver in a crash?
- Reduces acceleration
- Reduces deceleration
- Increases stopping/collision distance
- Absorbs kinetic energy
- Increases stopping/collision time
12. Active safety features in a car ie. crumple zones make driving safer by reducing the likelihood of a crash occurring.
13. When an object's weight is greater than its drag, what happens to the acceleration of free-fall acting on the object as it falls?
- Turns into kinetic energy
- Stays the same
- Increases
- Decreases
- Turns into sound energy
14. Drag/air resistance increases with speed.
15. The amount of KE an object has as it falls changes at terminal speed.
16. When an object is at terminal speed what happens to the object's potential energy and what does it do?
- Turns into kinetic energy
- Increases exponentially
- Turns into sound energy
- Decreases as it works against the friction between the object and air
- Turns into dust
17. Electric cars renew their supply of energy by recharging their batteries.
18. Which of the following explains how electric cars pollute the air?
- They don't have to recharge
- They use electricity
- Power stations make the electricity the car uses, and power stations pollute the air
- They have no exhaust pipe
- There are not many recharging stations currently available
19. The braking distance in a car is: proportional to its velocity squared, and proportional to its KE.
20. What happens to the kinetic energy of an object at terminal speed?
- Remains constant
- Decreases
- Becomes zero
- Increases
- Turns into potential energy