Physics Coefficients of Friction

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N? 

• 0.78
• 0.51
• 0.78 N
• 0.58 N

Tags

NGSS.HS-PS2-1

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N? 

• 0.78
• 0.51
• 0.78 N
• 0.58 N

Tags

NGSS.HS-PS2-1

Sam is hover boarding down they hall at a constant velocity. Assuming there is friction, which of the following must be true?

• The force applied by the board must be greater than the frictional force

• The frictional force must equal the force applied by the board

• The force applied must equal zero

• There is not enough information

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

In which direction does friction force act?

• Direction opposite of object's motion.

• In same direction as object's motion.

• Up direction.

• Down direction.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which object has the most sliding friction (kinetic friction) with the sloping surface?

All objects have equal masses. The slope material is the same for all objects.

• Object #1

• Object #4

• Object #3

• All have equal friction.

Which object has the most friction acting upon it?

The masses of the objects are equal.

• Object #1

• Object #2

• Object #4

• All have equal friction.

Which object has the most sliding friction (kinetic friction) acting upon it?

Only consider objects #1, #2, and #3. Do not consider object #4.

• Object #1

• Object #2

• Object #3

• Objects #1, #2, and #3 have equal sliding friction.

Tags

NGSS.MS-PS2-2

Which type of friction is the strongest? (has the greatest force)

• Kinetic friction (sliding friction)

• Rolling friction

• Static friction

• All forms of friction are equal for the same object.

Friction is which type of force?

• Circular force

• Action-at-a-distance force

• Contact force

• Fundamental force

Tags

NGSS.MS-PS2-2

Which friction coefficient would most likely describe tape sticking to a wood wall?

• 0.050

• 0.300

• 0.600

• 0.900