Invisible Forces
Invisible Forces
Invisible Forces
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<strong>Invisible</strong> <strong>Forces</strong><br />
What are <strong>Forces</strong> and What do they do
A force is a push or a pull that;<br />
• starts something moving<br />
• changes the direction of a moving object<br />
• changes the speed of a moving object<br />
•causes a moving object to stop.<br />
Start to<br />
move<br />
Change<br />
of speed<br />
Change<br />
direction
There are always two or more forces<br />
acting on an object.<br />
Force 1: Gravity pulling the boat<br />
down into the water.<br />
Force 2: Buoyancy is the force<br />
pushing up on the boat.<br />
Vocabulary : Gravity and Buoyancy
When two (or more) equal- strength<br />
forces act on an object, the forces are<br />
said to be balanced.<br />
The force of gravity pulls down<br />
on the globe while the hands<br />
exert an upward force.<br />
Vocabulary : Balanced <strong>Forces</strong>
Unbalanced forces cause objects to<br />
change their state of movement.<br />
The ball is in a state of rest.<br />
It is NOT moving.<br />
If a ball is stationary, UNBALANCED FORCES will cause it to move or change in<br />
some way.
Review: A force can be a Push or Pull.<br />
<strong>Forces</strong> can be VISIBLE and INVISIBLE.<br />
However ..<br />
some forces are invisible!<br />
Magnetism<br />
Electricity<br />
Gravity
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