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What is a force?
A push or a pull
What happens when forces are balanced?
They cancel out and do not change motion
What happens when forces are unbalanced?
The object’s motion changes
What is resultant force?
The total force acting on an object
If an object is not moving
are there forces acting on it?
but they are balanced
Yes
Do forces have direction?
Yes
What is friction?
A force that opposes motion
Give one example of a push force
Pushing a door
Give one example of a pull force
Pulling a rope
What happens when forces are equal and opposite?
They are balanced
Calculate: 10 N + 20 N
30 N
Calculate: 20 N – 10 N
10 N
A box has 15 N right and 15 N left. What is the resultant force?
0 N
Is a 0 N resultant force balanced or unbalanced?
Balanced
Why is a person sitting on a chair balanced?
Upward force equals downward gravit
