Understanding Forces and Electricity

Which sentence describes zero net force?

• a leaf falling from a branch on a tree

• a truck speeding up to get on the highway

• a book sitting on a desk

Marta is studying static electricity. Which question will help her the most?

• How big should magnets be to attract each other?

• Which materials are attracted to magnets?

• Do objects have to touch to transfer static electricity?

Which poles have the strongest magnetic attraction?

• N N

• S S

• N S

Which option has Car 1 having the greater force?

• Car 1 vs truck

• Car 1 vs Car

• Car 1 vs bicycle

The best way to look for metal pins and not get hurt is...

• shining a light on the ground

• Mowing the lawn

• magnet tied to a stick

Students pull on a rope. The rope moves in one direction. The force is

• balanced

• unbalanced

magnet is...

• forces that cancel each other out because they are equal in size and opposite in direction.

• the force that pulls objects down toward the center of the Earth.

• an object that attracts iron and a few other – but not all- metals.

Gravity is...

• the combination of all the forces acting on an object

• an object that attracts iron and a few other metals

• the force that pulls objects down toward Earth

Force is...

• the buildup of electric charges on an object

• a form of energy produced by the flow of electric charges.

• a push or pull, that may cause a change in an object's motion

Students pull on a rope. The rope moves in one direction. Why?

• one side has more gravity

• one side has more force