A.KNOW B.SEE C.SOLVE D.SETTLEREAD THE FOLLOWING TEXT, THEN CHOOSE T...

50.A.know

B.see

C.solve

D.settle

Read the following text, then choose the correct answer for each question.

The general principles of dynamics are rules that demonstrate a relationship between the

motions of bodies and the forces that produce those motions. Based in large part on the

work of his predecessors. Sir Isaac Newton deduced three laws of dynamics, which he

published in his famous Principia.

Prior to Newton, Aristotle had established that the natural state of a body was a state of

rest, and that unless a force acted upon it to maintain motion, a moving body would come

to rest. Galileo had succeeded in correctly describing the behavior of falling objects and in

recording that no force was required to maintain a body in motion. He noted that the effect

of force was to change motion. Huygens recognized that a change in the direction of

motion involved acceleration, just as did a change in speed, and further, that the action of

a force was required. Kepler deduced the laws describing the motion of planets around the

sun. It was primarily from Galileo and Kepler that Newton borrowed.

In short, Newton’s laws of Motion are: (1) a body at rest remains at rest, and a body in

motion remains in motion along a straight line, unless acted upon by an unbalanced force,

(2) if an unbalanced force acts upon a body, the momentum of the body changes in

proportion to the force and in the same direction as the force, (3) to every action or force,

there is an equal and opposite reaction.