Force and Motion Review

A student wanted to see how his toy car would roll on different types of flooring. He decided to roll the car on a tile floor, a wood floor, and a carpeted floor.

His experiment was designed to test the effects of which of the following forces?

• Gravity

• Gravity and Magnetism

• Magnetism and Friction

• Friction

Answer explanation

Friction is when objects are moving on surfaces that rub against that object. Some surfaces create more friction than others.

Tags

NGSS.MS-PS2-2

A teacher attaches pictures to the dry-erase board using tape during a sorting activity. The next day, one of the pictures was found on the ground.

Which force acted upon the picture causing it to fall?

• Friction

• Magnetism

• Gravity

• Evaporation

Answer explanation

Anytime something moves DOWN such as falling, it is due to gravity pulling it DOWN.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Which force most likely causes the skateboarder to skate down the halfpipe ramp over and over again?

• Magnetism

• Gravity

• Friction

• Pushing

Answer explanation

He is skating DOWN so gravity is affecting him

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

When riding a bicycle, which force mostly likely causes the bicycle to move forward?

• Gravity pulling the bike down to the ground

• Magnetism between the wheels and the pedals

• Pushing the pedals

• Pulling the pedals

Answer explanation

Gravity pulls down not forward. The wheels are not moving toward a magnet. We push down on the pedals to move them.

Which force most likely explains why skates roll differently on surfaces such as wood, cement, rubber, or carpet?

• Magnetism

• Gravity

• Pulling

• Friction

Answer explanation

Rolling on different surfaces is friction test

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A student wants to test the force of magnetism by placing objects on top of a piece of cardboard and then moving them with a magnet placed under the cardboard. Which items will help the students with this investigation?

• A paper clip, a thumbtack, and a toothpick

• A paper clip, a penny, and iron filings

• A piece of foil, iron filings, and an iron nail

• An iron nail, a paper clip, and a thumbtack

Answer explanation

We needed items that are all magnetic. A toothpick is wood, a penny is not magnetic, and foil is not magnetic

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

In a science classroom, the students performed an investigation, which included the procedural steps listed.

Hold a small paper boat in one hand.

Pour a small amount of iron filings mixed with salt to the paper boat.

What type of force could be used to move the iron filings?

• Gravity

• Friction

• Magnetism

• Push/Pull

Answer explanation

Iron filings are magnetic so use a magnet

Tags

NGSS.MS-PS2-5

The picture shows a row of dominoes.

Which force would most likely cause the row of dominoes to fall?

• Pull

• Magnetic

• Friction

• Push

Answer explanation

You push the dominoes to start them.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which investigation will best test the effects of gravity on moving objects?

• Pencils falling from the same height

• Balloons floating upward from the same height

• A bicycle speeding up on a flat surface

• A ball slowing down on a flat surface

Answer explanation

Falling is about gravity. 2 are about friction on a flat surface.

Tags

NGSS.MS-PS2-2

Students rolled a 22-gram car down three different ramps. The results from the investigation are shown in the table.

Which statement best explains why the car rolled down the wood ramp the fastest?

• There was more force applied to the car on the wood ramp

• There was less friction on the surface of the wood ramp

• The wood ramp was higher than the other ramps

• The car on the wood ramp has more mass

Answer explanation

The picture shows the ramps were same height, cars were the same mass which would cause the force to be the same too

Tags

NGSS.MS-PS2-2