Forces

A shopping cart is a compound machine that makes doing work easier. Compound machines have a mechanical advantage far greater. Therefore, a shopping cart makes it much easier to move large masses of groceries from one place to another.

Which force makes it difficult to move the groceries across the floor when the grocery basket is full?

• gravity

• friction

• air resistance

• push

Gravity is a force that attracts objects toward the Earth. Why does the little boy on the swing not fall to the Earth?

• Gravity does not exist in wooded areas.

• Air friction overcomes the force of gravity.

• The force of gravity is overcome by the tree branch holding up the swing.

• The little boys mass is less than the force of gravity.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Which force takes place when a match is quickly struck against the top edge on the book of matches?

• friction

• gravity

• air resistance

• magnetism

Magnets can attract magnetic materials and attract and repel other magnets. Which diagram best shows why a magnet would repel magnetic materials?

• diagram A

• diagram B

• diagram B and C

• diagram A, B, and C

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Marc and his brother take turns mopping the floor in their father's pizzeria each night. Which force becomes weakened when the floor is wet?

• air resistance

• friction

• magnetism

• gravity

Which diagram below best demonstrates magnetic attraction between magnetic objects?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Pick the correct word for the following definition:

tool that uses a magnetic needle to determine direction

• attract

• repel

• bar magnet

• compass

Pick the correct word for the following definition:

magnet which has the shape of a rectangular prism

• attract

• repel

• bar magnet

• compass

Pick the correct word for the following definition:

occurs when two opposite poles of two different magnets are turned towards each other

• attract

• repel

• bar magnet

• compass

Pick the correct word for the following definition:

occurs when two like poles of two different magnets are turned towards each other

• attract

• repel

• bar magnet

• compass