Mechanical Comprehension Practice Questions

1. Why does a heavy object require a larger amount of force than a light object to get it moving?

a. Because heavy objects are most often very large.
b. Because you need a lever to lift it.
c. Because heavy objects have a greater amount of inertia.
d. Because it has no momentum.

2. According to Newton’s First Law of Motion, objects at rest tend to stay at rest unless

a. they are acted upon by an unbalanced force.
b. they are positioned at high altitude.
c. a fulcrum is used to lift them.
d. None of the above

3. Shifting to a smaller gear on a mountain bike will have an effect on the speed of travel. The smaller sized gear will make pedaling easier but it will also

a. increase the speed of travel.
b. decrease the speed of travel.
c. have no effect on the speed of travel.
d. make the bicyclist work harder.

4. Two trucks are unloading 100 forty pound boxes of nails to a pallet 4 feet below the truck bed. The worker on one of the trucks has the use of a hand truck and a ramp. The worker on the other truck is lifting the 100 forty pound boxes with no ramp and no hand truck. Ignoring the effect of friction, the worker with the ramp and hand truck is

a. doing more work than the worker on the other truck.
b. doing less work than the worker on the other truck.
c. doing the same amount of work as the worker on the other truck.
d. doing 100 joules of work.

5. Which of the following examples does not make use of a mechanical advantage?

a. Using a pry bar to pull a nail from a board
b. Moving a load of wood with a wheelbarrow
c. Using a screwdriver
d. Sliding a heavy box along a concrete floor.

6. The mass of an object is measured in

a. liters
b. kilograms
c. joules
d. none of the above.

7. Which of the following examples does not make use of a wedge?

a. Choosing a sand wedge to hit your golf ball
b. Splitting firewood with a chisel and sledge hammer
c. Chopping wood with an axe
d. Using a lever to lift a load

8. A block and tackle refers to a device which is used to

a. put under the wheel of a vehicle to prevent it from rolling backward.
b. prevent fish from escaping the hook.
c. leverage a stationary object.
d. hoist an object into the air by means of rope and pulleys.

9. Downshifting an auto or a truck causes

a. a decrease in speed and an increase in torque.
b. an increase in speed and a decrease in torque.
c. no change in speed and no change in torque.
d. None of the above

10. Shifting to a higher gear in a car or truck causes

a. a decrease in torque and an increase in speed.
b. an increase in torque and a decrease in speed.
c. an increase in both speed and torque.
d. None of the above

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