Lab Quiz 13

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

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

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

• zero
• normal force
• weight
• friction

A block weighing 10.0 newtons is on a ramp inclined at 30.0° to the horizontal. A 3.0-newton force of friction, F_f , acts on the block as it is pulled up the ramp at constant velocity with force F, which is parallel to the ramp, as shown in the diagram below. What is the magnitude of force F?

• 7N
• 8N
• 10N
• 13N

A block rests on a ramp, making angle θ with the horizontal. As theta is increased

• the blocks mass will decrease
• the blocks mass will increase
• the blocks component of weight parallel to the ramp will increase
• the blocks component of the weight parallel to the ramp will decrease

A block rests on a ramp, making angle θ with the horizontal. As theta is increased

• the blocks mass will decrease
• the blocks mass will increase
• the normal force will increase

• normal force will decrease