Friction Physics

A box takes 40 N to start moving when the coefficient of static friction is .54. What is the weight of the box? 

• 81 N

• 18 N

• 98 N

• 74 N

Tags

NGSS.MS-PS2-2

A box weighing 46 newtons rests on an incline that makes an angle of 25° with the horizontal. What is the magnitude of the component of the box’s weight perpendicular to the incline?

• 19N

• 21N

• 42N

• 26N

An 8.0-newton block is accelerating down a frictionless ramp inclined at 15° to the horizontal. What is the magnitude of the net force causing the block’s acceleration (parallel to the ramp)?

• 0N

• 2.1N

• 7.7N

• 8.0N

Tags

NGSS.MS-PS2-2

A cart rolls down an inclined plane with constant speed as shown in the diagram below. Which arrow represents the direction of frictional force?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A 10.-newton block is sliding down a 30-degree incline at a constant speed. What is the force of friction?

• 5N

• 4.9N

• 10N

• 98N

Tags

NGSS.MS-PS2-2

A 10.0-kilogram mass held at rest on a frictionless 30.0º incline by force F. What is the magnitude of force F?

• 49.1N

• 98.1N

• 85N

• 9.81N

Tags

NGSS.HS-PS2-1

Normal force is

• Always opposite the weight

• Always parallel and down the incline

• Always perpendicular to the surface

• It depends on the direction of motion

Assuming both objects are at rest, which object is more massive? M1 or M2?

• M1 is more massive

• M2 is more massive

• both M1 and M2 are the same mass

To find the normal force

• mg

• sin(θ)mg

• cos(θ)mg

• tan(θ)mg

Tags

NGSS.HS-PS2-1

What is the force that opposes the relative motion or tendency of such motion of two surfaces in contact?

• Gravitational force

• Frictional force

• Magnetic force

• Electrostatic force

Tags

DOK Level 1: Recall