Inclined Plane

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

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

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?

• 0N
• 2.1N
• 7.7N
• 8.0N

A 1.0 × 10⁵-newton truck at rest on a hill that makes an angle of 8.0° with the horizontal. What is the component of the truck’s weight parallel to the hill?

• 1.4E3N
• 1E4N
• 1.4E4N
• 9.9E4N

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

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

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

A 3.0-kg block slides on a frictionless 20° inclined plane. A force of 16 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?

• 2 m/s^2 down the incline
• 5.3 m/s^2 up the incline
• 2 m/s^2 up the incline
• 3.9 m/s^2 down the incline

 A 50.-kilogram crate is on a frictionless plane at  some angle to the horizontal. The crate is pushed at constant speed up the incline by force F. If angle were increased, what would be the effect on the magnitude of force F?

• increase
• decrease
• stay the same
• not enough info

The diagram represents an object being held at rest on a frictionless incline. The net force is equal to

• zero
• normal force
• weight
• friction