Friction Inclines

If an object is at rest on an inclined plane, which of the following forces is greatest?

• Normal Force
• Friction
• Weight
• Both Normal Force and Weight are equal, so they both are the greatest.

Tags

NGSS.HS-PS2-1

A 4.7 kg box rests on a 25° incline. What is the magnitude of the component of the box’s weight perpendicular to the incline?

• 19N
• 21N
• 42N
• 26N

When the sum of all the forces acting on a block on an inclined plane is zero, the block

• must be at rest
• must be accelerating
• may be slowing down
• may be moving at a constant speed

Tags

NGSS.HS-PS2-1

An 0.8 kg block is accelerating down a frictionless ramp inclined at 15°. What is the force causing the block’s acceleration?

• 0.21 N

• 2.0 N

• 7.6 N

• 8.0 N

Tags

NGSS.HS-PS2-1

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.HS-PS2-1

A 1 kg block is sliding down a 30-degree incline at a constant speed. What is the force of friction?

• 0.5 N

• 4.9 N

• 10 N

• 98 N

Tags

NGSS.HS-PS2-1

You push a box down a ramp. The net force would be found by:

• F_gx + F_A - F_f

• F_A - F_gx - F_f

• F_gx + F_A + F_f

• F_f - F_A + F_gx

Tags

NGSS.HS-PS2-1

Which of the following is the best expression for the normal force?

• F_N = F_g cos(ϴ)

• F_N = F_g sin(Φ)

• F_N = F_g sin(180-ϴ)

• F_N = F_g cos(90-ϴ)

• F_N = F_g cos(180-Φ)

Tags

NGSS.HS-PS2-1