# Forces and Motion

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Definition of Distance Time Graphs
Shows the distance of an object over time.
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How does speed relate to the gradient?
The steepness tells you how fast an object is going.
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Choose 2 easy points on the graph. Read of the coordinates for both points. Find the difference between the two values for both x and y axes. Divide the change in the y values by the change in the x values
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What is the relationship between average speed,distance moved and time.
Average speed=distance moved/time taken
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Toy car experiment to investigate the motion of everyday objects
Put a ruler next to a length of wood, give the toy car a push down the wood, repeat, putting the length of wood at different heights each time.
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Forces can effect objects by altering...
... speed, shape and direction
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Give some examples of forces.
Air resistance, Friction(a force that opposes motion), gravitational pull, weight due to gravity, electrostatic(between charged objects), water resistance, reaction/contact force,upthrust.
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Define a vector
A vector quantity has magnitude and direction
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Define a scalar
a scalar quantity has magnitude only
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How do you find a resultant force
To find a resultant force find the difference between the two forces acting on the object. But be careful to look at the direction of movement.
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What are some factors effecting stopping distance
Alcohol,distractions,drug use, speed,tiredness,weather,condition of tyres/brakes,condition of road,speed,mass.
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The relationship between the moment of a force and it's distance from pivot
moment=force x distance from pivot
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What is meant by the term centre of gravity?
The weight of the body acts through it's centre of gravity
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To find the speed of an object on a distance time graph.
speed=distance/time remember to rearrange the equation
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How to find the centre of gravity in an irregular object
suspend the object from a stand using some string. Hang a plumb line from the same suspension point. Mark the vertical line. Repeat, suspended from different points.
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What is the principle of moments?
the sum of the clockwise moments=the sum of the anticlockwise moments about a point.
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## Other cards in this set

### Card 2

#### Front

How does speed relate to the gradient?

#### Back

The steepness tells you how fast an object is going.

### Card 4

#### Front

What is the relationship between average speed,distance moved and time.

### Card 5

#### Front

Toy car experiment to investigate the motion of everyday objects