Mechanical Advantage - Section 4.3 Quiz

What is not a way in which a machine makes work easier?
1. By increasing the amount of work done
2. By increasing the force that can be applied to an object
3. By increasing the distance over which the force is applied
4. By changing the direction of a force
What is not an example of a machine?
1. Bridge
2. Staircase
3. Ramp
4. Pulley
A pair of scissors is a kind of simple machine.

It is a type of lever, in which the material to be cut is placed closer to the pivot point (fulcrum) than your fingers. This is an example of
1. increasing the force.
2. decreasing the distance.
3. increasing the work done.
4. changing the direction of a force.
A screw is a kind of simple machine. It is a shaft with spiral grooves called threads formed on its surface.

The closer the threads are, the higher the mechanical advantage is. Why?
1. The threads increase the distance a force is applied
2. The threads change potential energy into mechanical energy
3. The threads increase the force over a shorter distance
4. The threads increase the input force required
A worker needs to haul a cart full of heavy boxes onto the deck of a house. He notices two ramps are set up, one being twice the length of the other one. Which one should he choose in order to reduce the amount of work he needs to do?
1. It doesn't matter. The same amount of work will be done using either ramp.
2. He should choose the longer ramp. He will find it easier to lift the boxes using it.
3. He should choose the shorter ramp. The work he has to do will go faster with a shorter ramp.
4. Neither ramp will do. Both ramps will increase the amount of work he needs to do.
Which simple machine does not increase the distance over which a force is applied?
1. Pulley
2. Wheel and axel
3. Inclined plane
4. Lever
The force you apply when using a pair of scissors is called the
1. input force.
2. mechanical force.
3. internal force.
4. output force.
What is the mechanical advantage of this lever?
1. 20
2. 100
3. 500
4. 10
What is the input force of this lever?
1. 49 N
2. 100 N
3. 5 kg
4. 20 N
What is the relationship between ideal mechanical advantage and actual mechanical advantage?
1. Ideal mechanical advantage is always greater because it does not account for friction
2. Ideal and actual mechanical advantages are often the same because friction is not normally encountered in machines
3. Ideal mechanical advantage is often less than actual mechanical advantage because an increase in speed of motion is often required
4. Ideal mechanical advantage is always greater because energy is created in ideal systems