Friction

A student uses a spring scale to pull a 50-gram block horizontally across a wood desk. Then the student pulls the block the same distance across surfaces of carpet, sandpaper, and glass. Which question is this investigation most likely designed to answer?

• How do block of different sizes react to force?

• How do different surfaces affect the amount of force needed to move a block?

• How do blocks affect spring scales?

• How does the mass of a block change when it is pulled across a desk?

Tags

NGSS.MS-PS2-2

Students conducted an experiment where they rolled a car down a ramp and measured the distance it traveled on different surfaces. Based on the results shown above, which surface has the most friction?

• Tarmac

• Grass

• Ice

• Sandpaper

Tags

NGSS.MS-PS2-2

Students rolled a truck down ramps covered in wood, rubber, carpet, and sandpaper. They then measured how far it rolled. What question are the students trying to answer?

• Does the type of truck affect the distance it will travel?

• Does the height of the ramp affect the distance a truck will travel?

• Does the type of surface of the ramp affect the distance a truck will travel?

• Does the color of the ramp affect the distance the truck will travel.

Tags

NGSS.3-PS2-1

NGSS.3-PS2-2

Two students were riding their bikes along a paved trail in the park. While one turned and talked to the other, his bike went towards the grass and he fell. Which of the following explains why he fell.

• The bike tires encountered less friction as they came in contact with the grass.

• The bike tires picked up speed as they came in contact with the grass.

• The bike tires rolled off the bike as they came in contact with the grass.

• The bike tires encountered more friction as they came in contact with the grass.

Tags

NGSS.MS-PS2-2

A student was riding a skateboard through his neighborhood when he hit a rough surface. Rough surfaces have ____________than smooth surfaces.

• more friction

• less friction

• the same level of friction

• less bumps

Tags

NGSS.MS-PS2-2

Some students were pulling rough and smooth soled shoes across a wooden floor with a spring scale. What question were the students trying to answer?

• Does the type of sole of a shoe affect the amount of force needed to move the shoe?

• Does the spring scale affect the amount of force needed to move the shoe?

• Does the wood floor affect the amount of force on the spring scale?

• Does the type of floor affect the movement of a shoe?

Tags

NGSS.MS-PS2-2