Balanced, Unbalanced, Static and Magnetic Forces

During field day elementary school students played a game of Tug of War. The team on the left exert 10 Newtons of force on their side of the rope. How much force does the team on the right have to exert to keep from being pulled over the line?

• 2 Newtons

• 5 Newtons

• 10 Newtons

• 20 Newtons

Tags

NGSS.MS-PS2-1

During a summer thunderstorm, Ellie observes a flash of lightning and immediately starts planning an investigation to create a static electricity experiment of her own. She rubs a plastic comb with a wool sock and holds it near some small scraps of paper, but nothing happens. 

What is the most likely reason that Ellie's experiment is not working?

• She did not rub the comb hard enough or long enough with the wool.

• The humidity from the summer storm disperses electrons, making it difficult for her comb to keep its charge.

• It is not possible to create a static charge in the comb, because only metal objects can hold a negative charge.

• The charge in the comb can only be discharged to metal objects.

Tags

NGSS.MS-PS2-3

Which objects will change direction due to gravity. Choose all that apply.

• An apple tossed in the air.

• A paper airplane is thrown in the air.

• A ball is rolled across the floor.

• A ball is thrown across the room.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

This is a crane picking up pieces of iron.

Which problem is being solved by the use of a magnet in the picture?

• building tall houses for a neighborhood

• moving heavy pieces of iron from the road

• making iron magnetic

• using a new crane

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-5

Balanced force

• when objects touch

• to apply

• when the forces exerted on opposite sides of an object are equal in strength

• when the forces exerted on opposed sides of an object are NOT equal in strength.

This is an example of a _____

• pull

• gravity

• push

• lift

Tags

NGSS.MS-PS2-1

This is an example of a _______

• push

• gravity

• lift

• pull

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

A force that pulls objects toward Earth is ________

• push

• gravity

• pull

• friction

Tags

NGSS.MS-PS2-4

A push and a pull on an object is an example of a _______

• mean thing to do

• gravity

• force

• speed

Tags

NGSS.MS-PS2-1

When an object is NOT in motion, the object is at __________

• speed

• rest

• gravity

• motion