Dynamics Review

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

Tags

NGSS.HS-PS2-1

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

Tags

NGSS.HS-PS2-1

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

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 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

Tags

NGSS.HS-PS2-1

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

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

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

Tags

NGSS.HS-PS2-1

 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

Tags

NGSS.HS-PS2-1

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

• zero
• normal force
• weight
• friction

Tags

NGSS.HS-PS2-1