Forces
This is a push or pull.
What is a force?
This force pulls objects toward Earth.
What is gravity?
A tool that makes work easier.
What is a simple machine?
A seesaw.
What is a lever?
Machines help people by making work ______.
What is easier?
These forces are equal.
What are balanced forces?
This force slows movement.
What is friction?
The pivot point of a lever.
What is a fulcrum?
A bicycle wheel.
What is a wheel and axle?
A tractor harvesting crops is a positive or negative impact? (Daily Double)
What is positive?
These forces cause movement because they are unequal.
What are unbalanced forces?
An apple falls from a tree because of this force. (daily double)
What is gravity?
This simple machine changes the direction of force.
What is a pulley?
A flagpole.
What is a pulley?
Factory smoke is a positive or negative impact?
What is negative?
A shopping cart starts moving when you push it. This type of force is acting.
What is an unbalanced force?
A sled slows down while moving across snow because of this force.
What is friction?
This simple machine helps lift objects using a ramp.
What is an inclined plane?
An axe.
What is a wedge?
Name one way machines help society.
Possible answers:
Two teams pull equally in tug-of-war.
What are balanced forces?
Would a toy car travel farther on carpet or tile?
What is tile?
Name all six simple machines.
A jar lid.
What is a screw?
Name one negative impact machines can have on the environment.
Possible answers: