Understanding Friction Concepts

Which of the following surfaces would likely create the most friction for a sliding object?

• Ice

• Sandpaper

• Glass

• Polished wood

If you push a toy car on a carpet and then on a smooth tile floor, what difference would you observe in its motion due to friction?

• The car moves faster on the carpet.

• The car moves slower on the tile floor.

• The car moves faster on the tile floor.

• The car moves at the same speed on both surfaces.

Tags

NGSS.MS-PS2-2

Which of the following actions would likely reduce the friction between two surfaces?

• Increasing the weight on the surfaces

• Making the surfaces rougher

• Adding a layer of oil between the surfaces

• Pressing the surfaces together more tightly

Why do car tires have treads?

• To increase friction with the road

• To decrease the weight of the car

• To make the car look stylish

• To reduce the noise made by the car

Which of the following best explains why a sled moves more easily on snow than on grass?

• Snow is colder than grass.

• Snow provides less friction than grass.

• Grass is softer than snow.

• Grass is more colorful than snow.

Why do ice skaters slide easily on ice?

• Ice is very cold and hard.

• Ice is very smooth and has low friction.

• Ice is transparent and reflects light.

• Ice is slippery because it is wet.

Tags

NGSS.MS-PS1-4

Which of the following materials would likely have the least friction when rubbed against metal?

• Sandpaper

• Wood

• Rubber

• Plastic

Friction is a force that acts in a/an (a)   direction of movement when Lex pushes a box across the floor.

• similar
• opposite
• parallel
• upward

Friction is a force that acts in a/an ___________ direction of movement.

• similar
• opposite
• parallel
• upward

Tags

NGSS.3-PS2-1

When we pour sand on an icy road, what force are we increasing to help cars stay on the road?

• electricity
• magnetism
• friction
• gravity