Forces
A push or pull is called what?
What is a force
When you open a door, you are applying what?
What is a push or pull
What do we call forces that are equal and opposite?
What is balanced forces
What is the force that slows things down when they rub together?
What is friction
Looking closely at something is called....
What is observation/observe
What happens when you apply force to an object?
What is it moves, stops, or changes direction
When you pull a wagon, the force is going in what direction?
What is towards you
What do unbalanced forces cause?
What is a change in motion
Is friction stronger on smooth or rough surfaces
What is rough surfaces
A guess about what might happen in an experiment is a what...
What is hypothesis
The more force you use, the greater the ....?
What is motion or speed.
If you push a ball harder, what happens to its motion?
What is it goes faster/further
What is a balanced force
Why do cars need friction on the road?
What is to move and stop safely
Information you collect in an experiment is called...
What is data
What tool can measure force? (HARD - we only mentioned this once in class...think back)
What is a scale
When two people push on a box in the same direction, what happens to the force?
What is the forces add together.
What force pulls everything towards the Earth?
What is Gravity
A drawing, chart, or object scientists use to explain something is called a...
What is model
What two things do you need to describe a force?
What is strength and direction
When two people push in opposite directions with the same strength, what happens?
What is nothing, the force is balanced.
What is an unbalanced force.
What is tile - less friction
Why do scientists repeat experiments or tests?
What is to make sure results are reliable