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Physics ­ Speeding up and Slowing Down

Forces between objects:

Whenever objects push or pull on each other they exert
equal and opposite forces.

EG: To pull a car out of the mud, the force of the tractor on the
ground needs to be greater than the force of the…

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Eg.) When a jet plane takes off, the thrust force of the engines is
greater than the air resistance. The resultant force is the
difference between the thrust force and the air resistance force
and therefore the resultant force is not zero. The greater the
resultant force, the quicker the…

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The Thinking Distance ­ the distance travelled in the time it
takes for the driver to react to something.
The Braking Distance ­ the distance travelled in the time it take
for the braking force to stop the vehicle.
The Stopping Distance = The Thinking Distance + The Braking

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If an object falls in fluid, the fluid drags the object. The drag
force increases with speed.

The resultant force is the object's weight minus the drag force.

The acceleration of an object decreases as it falls. This is
because the drag force increases as it speeds up, so the…


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