Mechanical Advantage Part2

What is a disadvantage of using an inclined plane to lift a heavy object?

• a. The object must be moved a greater distance.

• b. It takes less effort to move the object.

• c. Many objects are difficult to lift straight up.

• d. Heavy object usually take up more space.

Friction acts in a direction_______ to the direction of an object's motion.

• a. unrelated

• b. equal

• c. opposite

• d. perpendicular

 The unit for force is _____. 

• A.  Neutrons 

• B.  Newtons

• C.  Tons

• D.  Inches 

A force exerted over a distance to move an object is ______________________.

• a. power

• b. work

• c. momentum

• d. Watt

• a. Straight lift

• b. Inclined plane

• c. They are the same

• d. None of these

Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?

• a. 1

• b. 10

• c. 100

• d. 1000

 A lever and fulcrum are used to lift a fallen tree, which has a weight of 480 N. If the lever has a mechanical advantage of 5.5, what is the input force that will begin lifting the tree off the ground?

• a. 5.5 N

• b. 40.7 N

• c. 87.3 N

• d. 2640 N

This 2000 N weight is raised 1 meter by pulling 4 meters of rope. What force was required to pull the rope?

8000 N

• a. 500 N

• b. 1000 N

• c. 2000 N

• d. 800N

 A 10 Newton effort force is required to lift a 10 kg box just off the ground. What is the effort required to lift the box off the ground using a 3m long lever? [The fulcrum is placed 0.5m from the box.]

• a. 0.5 N

• b. 2.0 N

• c. 5.0 N

• d. 8.0 N

 

If a pulley system has a mechanical advantage of 4, what does that mean?

• This means that it is 4 times easier to lift this load.

• This means you only need a quarter of the effort to lift the load.

• For example, if you lifted 100 kg, it would only take 25 kg of effort.

• All of the above