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PHYS 1405: ELEMENTARY PHYSICS I – UNIT TEST 1 PLAIN MULTIPLE CHOICE

PHYS 1405: ELEMENTARY PHYSICS I – UNIT TEST 1
PLAIN MULTIPLE CHOICE
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Answer on Scantron – 14 Questions x 2 = 28 Total Possible Points
1) Using the dimensions given for the variables in the table on the left below, determine which of the following
expressions is correct (based on final units).
(c)
2) Which expression is FALSE concerning the vectors shown in the sketch? Note: In the answers below, Bold text
indicates a vector and Italics text indicates a scalar.
A. C = A + B
B. C + A = –B
C. A + B + C = 0
D. C < A + B E. A2 + B2 = C2 3) Which of the following displacement vectors (if any) are equal? (if there are two correct answers, mark them on your Scantron) 4) A planet orbiting the Sun exhibits constant acceleration because its ________________ is continuously changing. A. Speed B. Length of year C. Rotation D. Distance E. Direction of motion 5) To determine the speed of an object, what measurements must you make? A. distance and direction B. distance and mass C. time, distance, and volume D. distance and time 2 6) In the absence of air resistance, which of these objects will fall at the fastest rate when dropped? A. the ball with a mass of 75 kg B. the ball with a mass of 25 kg C. the ball with a mass of 10 kg D. They all fall at the same rate. 7) You create a small rubber ball and then make three other balls of the same diameter from lead, foam, and wood. Which ball has the greatest inertia? A. the rubber ball B. the lead ball C. the foam ball D. the wood ball 8) Equilibrium occurs when …? There may be more than one correct answer. A. all the forces acting on an object are balanced. B. the sum of the +x forces on an object equals the sum of the –x forces. C. the net force on the object is zero. D. the sum of the upward forces equals the sum of the downward forces. E. all of the above 9) The measure of the amount of inertia something has is called …? A. Mass B. Newton’s First Law C. Weight D. Gravity 10) Suppose a Hot Wheels toy car and an empty 18-wheeler semi-truck, both going the same speed, drive off a cliff on the Moon. Which one will hit the ground below the cliff first? A. The Hot Wheels toy car B. The 18-wheeler semi-truck C. Both will hit the ground at the same time D. There is no gravity on the moon, so the two objects will not fall. E. Cannot be determined from the information provided. 11) In which of the following cases is the vehicle described NOT accelerating? A. A car traveling in a straight line, increasing its speed from 10 meters per second to 20 meters per second B. A bus traveling at a constant speed over the crest of a hill C. A train traveling in a straight line at a constant speed D. A car traveling at 15 meters per second around a curve 12) A rock thrown straight upward rises, stops, and starts to fall again. What is its acceleration at the top of its flight? A. zero B. 32.2 ft/s C. 9.81 m/s2 D. 19.62 m/s 3 13) The graph on the right shows the distance an object travels during a 12-second period. At which time interval is the velocity equal to zero? A. 0−5 sec B. 5−8 sec C. 8−10 sec D. 10−12 sec 14) A student throws a ball directly upward over a steep cliff. Which set of motion graphs best represents the motion of the ball from the time it leaves the student’s hand until just before the ball hits the ground? A. Set A B. Set B C. Set C D. Set D E. None of the above

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