# Forces, braking and terminal velocity

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• Created by: Lotto65
• Created on: 23-12-15 14:05
What is the resultant force if an object is travelling at a steady speed?
Zero
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Are driving forces equal to resistive forces?
Yes- EQUAL AND OPPOSITE
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Give examples of what causes resistive forces?
Air resistance or friction between moving components
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The faster the speed... (deceleration)
The bigger the deceleration needed to stop the vehicle
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The faster the speed...(braking)
The larger the braking force to stop the vehicle
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What is the general equation explanation for stopping distance?
Thinking distance+ braking distance
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What increases thinking distance?
Tiredness; Under influence of alcohol or drugs
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What increases braking distance?
Poor road quality; Bad weather conditions; Bad car conditions (worn tyres or brakes)
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Why does tiredness increase thinking distance?
Increased reaction time
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What is the equation for thinking distance?
Speed x Reaction time
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What is the resultant force on a falling object?
Gravity
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What is acceleration due to gravity as a figure?
10m/s squared
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What is the equation symbol for acceleration due to gravity?
g
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What do we call the force of gravity on an object?
Weight
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What are the two meanings of 'g' in equations?
Gravitational field strength; acceleration due to gravity
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What can be gravitation field strength's unit?
N/Kg
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What force is exerted on an object when it falls through a fluid?
Drag
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The faster an object falls...(drag)
The greater the drag force
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What happens when there is drag?
The resultant force decreases and acceleration decreases
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What happens after this?
Drag force equals weight of object so it no longer accelerates and goes at a constant velocity instead
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At this point what value is the resultant force?
Zero
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What is terminal velocity?
The velocity reached when the drag force on an object is equal and opposite to the force driving the object
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## Other cards in this set

### Card 2

#### Front

Are driving forces equal to resistive forces?

#### Back

Yes- EQUAL AND OPPOSITE

### Card 3

#### Front

Give examples of what causes resistive forces?

### Card 4

#### Front

The faster the speed... (deceleration)

### Card 5

#### Front

The faster the speed...(braking)