Angle of Inclination

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

The normal force equals

• mg cos

• mg sin

• g

• 2g

A 25 N crate slides down a frictionless incline that is 25° above the horizontal. The magnitude of the normal force of the incline on the crate is:

• 11 N

• 23 N

• 25 N

• 100 N

A heavy wooden block is dragged by a force F along a rough steel plate, as shown in the diagrams for two cases. The magnitude of the applied force F is the same for both cases. The normal force in (ii), as compared with the normal force in (i) is:

• the same

• greater

• less

• none of the above

A 25 N crate is held at rest on a frictionless incline by a force that is parallel to the incline. The incline is 25 degrees above the horizontal.

The magnitude of the applied force is ________

• 4.1 N

• 4.6 N

• 11 N

• 23 N

A 25 N crate is held at rest on a frictionless incline by a force that is parallel to the incline. The incline is 25 degrees above the horizontal.

• 4,1

• 4.6

• 11

• 23

The diagram below shows a box held stationary on a ramp by a string connected to a wall.

Which of the following relationship is true?

• A

• B

• C

• D

How do the normal force, friction force, and tension change when the angle θ is increased?

• A

• B

• C

• D

A 15 kg mass is sliding along a frictionless floor with an acceleration of 5 m/s2. What is the magnitude of the net force acting on the mass?

• 15 N

• 10 N

• 20 N

• 75 N

A block is first placed on its long side and then on its short side on the same inclined plane. The block slides down the plane on its short side but remains at rest on its long side because ___.

• the short side is smoother

• the frictional force is less because the contact area is less

• the center of gravity is higher in the second case

• the normal force is less in the second case