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# Force

### 8th Grade forces vocabulary review

What is force? A push or a pull
Is force a scalar or vector measurement? vector
What unit of measurement describes force? newtons
What 2 things are measured when looking at force? the magnitude (strength) in newtons and the direction of the force
What is a contact force? A force that actually touches the item that it is pushing or pulling
What is a non-contact force? A force that doesn't actually touch the thing it is pushing or pulling
Name 6 contact forces. friction, air resistance, normal force, applied force, tension force, spring force
Name 3 non-contact forces. magnetic force, electrical force, gravitational force
What is friction? A contact force that pushes back on an object that is sliding. It is a resistance force.
What changes the amount of friction? The rougher the surface is, the more friction there is.
What is a resistance force? A force that goes opposite, pushes against, an object that is trying to move.
What is air resistance? A contact force that is a resistance force. It is applied on objects that are moving through the air.
What is normal force? An equal and opposite reaction. A book that sits on the table has the table pushing back! That table pushing back is the normal force. it is a contact force.
What is applied force? A contact force when something or someone pushes or pulls something.
What is tension force? A contact force when force is pulling from opposite ends. Typically this is a rope or wire but it can also be other things.
What is a spring force? A spring force is a contact force that shows up when a spring is compressed (smooshed) or stretched.
What is gravitational force? A non-contact force. It is the force of attraction between any 2 objects. It is most noticeable between huge objects like planets (but all matter, including you, exerts gravity!)
What is electrical force? A non-contact force of attraction and repulsion between subatomic particles (positives and negatives, like repels, opposites attract).
What is magnetic force? A non-contact force that magnets exert to push (like poles) or pull (opposite poles) other magnets and some types of metal.
Are there forces acting on something when it is sitting still? yes
Are there forces acting on something when it is moving? yes
Created by: MsLW