...Newton's Laws: Forces

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The following three questions refer to the material you were to read in preparation to the lesson. Questions one and two require you to write a three or four sentence response. Number three is a multiple choice question. Click in the appropriate circle.

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1.

The word "push" is reasonably good synonym for the word FORCE.

Is "hold" a synonym for force?

How about "support"?

How many others can you think of?



2.

The engine on a fighter airplane can exert a force of 105,840 N (24,000 pounds).

The take-off mass of the plane is 16,875 kg. (It weighs 37,500 pounds.)

If you mounted this aircraft engine on your car, what acceleration would you get? (Please use metric units. The data in pounds are given for comparison. Use a reasonable estimate for the mass of your car. A kilogram mass weighs 2.2 pounds.)




3.

Which is correct?

If action always equals reaction, a horse cannot pull a buggy because the action of the horse on the buggy is exactly cancelled by the reaction of the buggy on the horse. The buggy pulls backward on the horse just as hard as the horse pulls forward on the buggy, so they cannot move.

The horse pulls forward slightly harder on the buggy than the buggy pulls backward on the horse, so they move forward.

The horse pulls before the buggy has time to react, so they move forward.

The horse can pull the buggy forward only if the horse weighs more than the buggy.

The force on the buggy is as strong as the force on the horse, but the horse is joined to the earth by its flat hoofs, while the buggy is free to roll on its round wheels.



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