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revision > Physics Module 3 > Flashcards

Physics Module 3 Flashcards

0
Q

What does an unbalanced force mean on a car?

A

Acceleration in the second direction of the force- newtons 2nd law of motion

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1
Q

What does a balanced force mean?

A

Balanced forces so steady speed and direction

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2
Q

What is acceleration?

A

How quickly you speed up

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3
Q

On a speed time graph what does the flat bit mean?

A

Steady speed

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4
Q

On a speed time graph what is the area underneath?

A

Distance traveled at the time interval

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5
Q

What does velocity describe?

A

Speed and direction

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6
Q

What is speed?

A

Distance travelled in a certain time

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7
Q

What do the curves show on a distance time graph?

A

Acceleration/ deceleration

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8
Q

What are the 3 ways friction occurs?

A

Friction between solid surfaces which are gripping, friction between solid surfaces which are sliding past each other, resistance/drag from fluids

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9
Q

What does the resistance force equal?

A

Accelerating force

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10
Q

What does terminal speed depend on?

A

Drag, the greater the drag the lower the terminal speed

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11
Q

What are the 5 different force diagrams and what forces do they show?

A 
Stationary object-balanced
Steady horizontal speed-balanced
Steady vertical speed- balanced
Horizontal acceleration-unbalanced
Vertical acceleration-unbalanced
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12
Q

What is gravity?

A

The force of attraction between all masses

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13
Q

What happens to mass and weight of an object on the moon?

A

Same mass but different weight

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14
Q

Which direction do gravity and weight act?

A

Downwards

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15
Q

What do thrust/push/pull do?

A

Speed something up

16
Q

What do drag/air resistance/friction do?

A

Slows something down

17
Q

As speed doubles on a graph what happens to the braking distance?

A

It increases 4 fold

18
Q

What happens to the braking distance as speed trebles on a graph?

A

Braking distance increases 9 fold

19
Q

What affects thinking distance?

A

Speed/concentration

20
Q

What affects braking distance?

A

Speed/weight/brake condition/grip condition (road surface/weather/tyre condition)

21
Q

How do crumple zones work?

A

They increase time and change shape to absorb kinetic energy from the car and reduce the impact on passengers

22
Q

How do ABS brakes work?

A

They help drivers keep control of car steering when braking hard, ABS pump on and off to stop wheels locking and prevent skidding

23
Q

What can cause a change in momentum?

A

A change in velocity

24
Q

The longer it takes for a change in momentum means…

A

The smaller the force, reduces injuries

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