What is a force?
What is friction?
The rubbing of objects that are moving.
What kind of simple machine is a ramp?
An inclined plane.
Two dogs fighting over a toy using the same force
Balanced
How many simple machines are there?
6
What kind of force is gravity?
A pull
Low or high friction?: Slippery shorts on a slide
What kind of simple machine is a flag pole?
A pulley
A moving vehicle
Unbalanced
The fulcrum
When you push or pull an object, you are applying a _______ force to it.
contact
Low or high friction?: Hiking boots on the rocky soil
High
What kind of simple machine is a broom?
Lever
A person skydiving.
Unbalanced
What kind of simple machine is a knife?
The ______ force is zero when forces are balanced.
Net
Low or high friction?: Ice skates on ice
Low
What kind of simple machine is a doorknob?
Wheel and axle
A parked car
Balanced
Why do the bottoms of your shoes have bumps?
For friction!
Low or high friction?: A snail going up a tree
High
What kind of simple machine is a bottle cap?
Screw
An elephant and small dog playing tug of war
Unbalanced