# Forces, acceleration and stopping distance

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• Created by: 2002_ames
• Created on: 27-02-16 14:16
What happens to an object if the resultant force remains the same?
The velocity is constant
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What are the formulas for acceleration?
Change in speed/time. OR. Force/mass
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What is the resultant force?
The vector sum of forces acting on the object
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What is newtons 3rd law? What does it mean?
Every action has an equal and opposite reaction. It means that when two objects interact, the forces they exert on each other are always equal
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What is terminal velocity?
The highest velocity of an object
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What is the difference between distance and displacement?
Distance involves no direction, displacement does
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What is the difference between speed and velocity?
Speed involves no direction, velocity does
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What is the typical walking speed?
1.5 m/s
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What is the typical running speed?
3 m/s
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What is the typical cycling speed?
6 m/s
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What is the formula for distance?
Speed x time
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What is acceleration measure in?
m/s^2
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What factors affect thinking distance?
Tiredness, distractions, alcohol, drugs, speed
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What factors affect braking distance?
Speed, condition of brakes and tyres, mass of car, ice, snow and wet roads
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What is the formula for stopping distance?
Braking distance + stopping distance
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As you increase in speed what happens to the air resistance? Why?
It increases. This is because more air particles have to be moved out of the way in a shorter time
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On a speed-time graph, how do you work out the distance?
Calculate the area underneath the graph
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What is thinking distance?
The distance you travel in the time it takes you to react
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What is braking distance?
The distance travelled whilst applying brakes
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## Other cards in this set

### Card 2

#### Front

What are the formulas for acceleration?

#### Back

Change in speed/time. OR. Force/mass

### Card 3

#### Front

What is the resultant force?

### Card 4

#### Front

What is newtons 3rd law? What does it mean?

### Card 5

#### Front

What is terminal velocity?