What Do You Know About inclined Planes?

What direction does friction act relative to motion?

• in the same direction
• in the opposite direction 
• need more information
• depends on the force

Answer explanation

Look around for inclined planes...Seriously

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

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

• mg

• sin(θ)mg

• g

• sin(θ)g

What are the units on the force due to friction?

• none
• Newtons
• meters
• kilograms

When looking at friction problems, if the net force in the x-direction on an object is zero, what can we say about its acceleration?

• it is positive

• it is negative

• it is zero

• not enough information is given

Normal force is

• Always opposite the weight

• Always parallel and down the incline

• Always perpendicular to the surface

• It depends on the direction of motion

A simple machine is a device that helps to reduce the amount of _____ required to work.

• force

• work

• energy

A sloping force, like a ramp, that reduces the mount of force required to lift an object.

• screw

• inclined plane

• wheel and axle

What is the proper definition of an inclined plane?

• something that flies in the sky

• a wheel & axle

• Also known as a ramp, it is a flat supporting surface tilted at an angle, with one end higher than the other, used as an aid for raising or lowering a load

• a wedge

The longer the inclined plane, the ___________________ to move the object

• the less force you need

• the more force you need

• the more work you need to complete

• the less work you need to complete