# Physics- forces- revision

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• Created by: holly.567
• Created on: 22-02-16 18:32
What is Newtons third Law?
That every action has an equal and opposite force.
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What are tow forces acting on an object called?
The action and reaction forces.
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What is the stopping distance?
Thd total distance it takes for the vheical to stop.
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How do you work out stopping distance?
Braking distance+ thinking distance.
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What is a resultant force?
The single force that has the same effect on the object as all individual forces acting together.
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How do you work out the resultant force?
Mass x acceleration (f=ma)
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What happens to an object when its resultant force is zero?
When the resultant force is zero the object will have a constant velocity.
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How do you work out acceleration?
Final velocity-inital velocity/ time.
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What are the units for acceleration?
m/s^2
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What is acceleration directly proportional to?
Acceleration is directly proportional to the resultant force acting on it.
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What will happen if a large resultant force is applied to an object?
The greaster the resultant force acting on an object the faster the object will travel because the more force being applied to an object the quicker it will move.
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What happens to an object if there is littke resultant force being applied to it?
The object wont move very fast as little force is being applied to move the object.
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What is breaking distance?
Breaking distance is the distance travelled whilst the breaks are applied.
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What effects the breaking distance?
Speed, weather(wet/dry/icy roads), Condition of tires(age/size/type), condition of breaks(age/size/type).
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What happens to your breaking distance if your reaction time is increaed?
An increase iin reaction time means that there would be no change in the braking distance.
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What is thinking distance?
Thinking distance is the distance you travel in the time that it takes you to react.
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Drugs, speed, tiredness, drunk (alchol), distractions (phone, chikdren in the car).
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Whart happens if forces are equal?
The object will move at a constant velocity.
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## Other cards in this set

### Card 2

#### Front

The action and reaction forces.

#### Back

What are tow forces acting on an object called?

### Card 3

#### Front

Thd total distance it takes for the vheical to stop.

### Card 4

#### Front

Braking distance+ thinking distance.

### Card 5

#### Front

The single force that has the same effect on the object as all individual forces acting together.