Physics Midterm Quiz

All of the following are examples of inclined planes EXCEPT -

• a table

• slide

• windshield

• pyramids

The greatest amount of force is required to move the metal block up which inclined plane?

• a

• b

• c

• d

Movers needed to move a heavy box from the bottom of some stairs to the top of the stairs. They placed a ramp over the stairs and pushed the box up the ramp.

Which best explains why the movers used a ramp to move the box?

• a sloping ramp up which heavy loads can be raised

• A threshold ramp can be composed of either metal or rubber

• The ramp reduced the amount of

  force needed to move the box.

• the incline of the ramps degree helps to determine the boxes speed

The inclined plane makes work easier by __________________ the amount of effort that must be applied to raise or lower a load.

• supplying

• applying

• the force of

• reducing

How does distance change the effort when using an inclined plane?

• as distance increases, effort increases

• as distance increases, effort decreases

• as effort decreases, the distance is the same

• as effort increases, the distance is the same

For friction on an incline, what direction does F_p point?

• Always up the incline and parallel to the surface

• pulls in the middle from all directions

• pulls away from gravity, going up

• Always down the incline and parallel to the surface

Rougher surfaces have ...

• harder fristion

• greater friction

• the least amount of friction

• no friction

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?

• its going up

• its going down

• its exponential

• its zero

What direction does friction act relative to motion?

• goes positve

• goes negative

• opposite direction

• neutral

Normal force is

• Always perpendicular to the surface

• Opposite to the surface

• Against the surface

• Moving away from the surface