What is Newton's Third Law of Motion?
A. What goes up must come down.
B. For every action, there is an equal and opposite reaction.
C. Reactions are a result of large actions.
D. Mass cannot be destroyed.
Which material is best suited for use as a boat anchor?
A. foam
B. metal
C. wood
D. glass
What mechanical motion principle do the brakes in a car or on a bicycle use?
A. friction
B. centrifugal force
C. momentum
D. acceleration
The center of gravity of a baseball bat would be best described as __________.
A. near the skinny end
B. at the top
C. near the fat end
D. near the grip
There are three beams that are each 10 feet long and all of the same size. One is made of wood, another of steel, and the third of concrete.
If identical loads are applied to these three beams, which of the following will occur?
A. The steel beam will deflect less than the wood beam.
B. The wood beam will deflect less than the concrete beam.
C. The wood beam will deflect less than the steel beam.
D. The concrete beam will deflect more than the other two.
An elevator is most similar to which of the following mechanical devices?
A. a spring
B. a hydraulic jet
C. a lever
D. a crane
A concrete beam has a maximum strength of 3,000 psi (pounds per square inch). In an experiment, a 500pound weight is placed in the center of the beam, and the stress in the beam is measured to be 1,000 psi.
If the stresses in the beam continue to increase at the same rate with added weight, how much additional weight can be added to the same location on the beam before the beam will break?
A. 500 pounds
B. 1,000 pounds
C. 1,500 pounds
D. 3,000 pounds
A pump is typically used to accomplish which of the following tasks?
A. to clarify liquids
B. to separate liquids
C. to move liquids downhill
D. to move liquids uphill
In the diagram shown above, the spring is very stiff and can be stretched 1 inch by a pulling force of 100 pounds.
How much force must be applied to the block in order to move the box 3.5 inches to the left?
A. 150 pounds
B. 250 pounds
C. 350 pounds
D. 450 pounds
The sprocket on a bicycle is most similar to which of the simple mechanical devices listed below?
A. a gear
B. a spring
C. a lever
D. all of the above
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