Inclined Plane Review

A 20kg box is pulled up an incline of 60 degrees on a surface that has a coefficient of friction of 0.09, with an applied force of 221N. What is the resulting force?

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.

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

Which of the following is the best expression for the Normal Force?

• F_N = mg cos(ϴ)

• F_N = mg sin(ϴ)

• F_N = mg sin(180-ϴ)

• F_N = mg cos(90-ϴ)

If there is no friction, then the accelerating force would be equal to

• mg

• sin(θ)mg

• g

• sin(θ)g

A block slides down a frictionless inclined plane that makes an angle θ with the horizontal.

Which of the expressions shown below expresses force which is parallel to the inclined surface?

• mg cos

• mg sin

• g

• 2g