Physics 163

Unit 2: Newton's Laws of Motion

Problem Set C

Multiple Choice:

Which of the following statements are true? Choose all that apply by listing their letter in alphabetical order with no spaces, commas, or other marks between letters.

a. If the net force acting upon an object is directed to the right, then the object MUST be moving to the right.

b. The weight of an object can be determined by multiplying the mass of the object (in kilograms) by the force of gravity (in Newtons).

c. If an object is moving upwards, then there MUST be an upward force acting upon the object.

d. The mass of an object on Earth will be the same as the mass of the same object when placed on the moon.

e. A downward moving elevator, supported by a cable, is slowing down. In this instance, the upward force of tension MUST be greater than the downward force of gravity.

f. The weight of an object is the same thing as the force of gravity acting upon an object.

g. If an object is moving to the right and slowing down, then one can be certain that either there is more right force than left force acting upon the object or that there is no left force acting upon the object.

h. If a falling object has reached a terminal velocity, then it must be encountering air resistance.

i. If an object is moving to the right and slowing down, then one can be certain that either there is more left force than right force acting upon the object or that there is no right force acting upon the object.

j. If an object is accelerating upwards, then there MUST be an upward force acting upon the object.

(List all in alphabetical order with no spaces or punctuation marks.)

TIP:

These statements all target your conceptions (or misconceptions) regarding force, mass, acceleration and motion. A considerable amount of information on these topics can be found online at The Physics Classroom.

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