Kinds of Friction

You can move heavy boxes by sliding them over the ground, or you can put them on a dolly and then roll them over the ground. Which way makes it easier to move the boxes? Why?

• Sliding the boxes on the floor is easier than using the dolly because rolling friction is less than sliding friction

• Sliding the boxes on the floor is easier than using the dolly because sliding friction is less than rolling friction.

• Rolling the boxes over the floor on the dolly is easier because sliding friction is less than rolling friction.

• Rolling the boxes over the floor on the dolly is easier because rolling friction is less than sliding friction.

You use _____ friction when you leave marks on paper with a pencil “lead.”

• static friction.

• sliding friction.

• rolling friction.

The weakest type of friction that occurs between solid surfaces is _____ friction.

• sliding friction

• rolling friction

• static friction

• None of the above

Static friction prevents you from slipping when you walk on a sidewalk.

• True

• False

If I kick a soccer ball across the field, what vocabulary word tells me why the ball would slow down in the grass?

• acceleration

• friction

• gravity

If you roll a toy car on different types of material. What are you testing by rolling the car on foil, felt, or carpeted material?

• gravity

• gravity and magnetism

• magnetism and friction

• friction

If I kick a soccer ball across the field, why would the ball slow down in the grass?

• acceleration

• friction

• gravity

• energy

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which type of friction acts on an object that is not moving?

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction

When a book slides across a table, which type of friction is primarily acting on it?

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction

Which type of friction is generally the weakest?

• Static friction

• Sliding friction

• Rolling friction

• Fluid friction