Question1: Choose the correct answer.
1. An object in free fall when …………………….…..
a. experiences no air resistance.
b. undergoes a downward acceleration.
c. has an acceleration with a magnitude of 9.81 m/s2 near Earth’s surface.
d. all of the above
2. The speed of a car will increase if the car’s ……………………..
a. initial velocity is positive and its acceleration is zero.
b. initial velocity is positive and its acceleration is positive.
c. initial velocity is positive and its acceleration is negative.
d. initial velocity is negative and its acceleration is positive.
3. Which of the following units is the SI unit of velocity?
a. meter
b. meter per second
c. meter x second
d. second per meter.
4. Suppose you are given a position versus time graph. The slope of a line drawn tangent to
a point on the curve of this graph describes what quantity?
a. acceleration
b. instantaneous velocity
c. displacement
d. position
5. Which of the following is the equation for acceleration?
a.
b. a = v x t
c.
d. a =
6. When a car’s velocity is positive and its acceleration is negative, what is happening to the car’s
motion?
a. The car slows down.
b. The car travels at constant speed.
c. The car speeds up.
d. The car remains at rest.
7. The graph above describes the motion of a cyclist. The graph illustrates that the
acceleration of the cyclist ……………………
a. is constant.
b. increases.
c. decreases.
d. is zero.
8. The graph above describes the motion of a cyclist.
During the interval shown, the cyclist is…………………..
a. slowing down.
b. traveling at the same speed.
c. speeding up.
d. at rest.
9. What is the speed of an object at rest?
a. 0.0 m/s
b. 1.0 m/s
c. 9.8 m/s
d. 9.81 m/s
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Question2: problem solving.
1. A sports car traveling at 24.7 m/s slows at a constant rate to a stop in 16.00 s. What is the
displacement of the sports car in this time interval?
…………………………………………………………………………………………………………..
………………………………………………………………………………………………………….
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
2. A rock is thrown downward from the top of a cliff with an initial speed of 13 m/s. If the rock
hits the ground after 2.7 s, what is the height of the cliff?
(Disregard air resistance. a = - g = - 9.81 m/s .)
……………………………………………………………………………………………………………
……………………………………………………………………………………………………………
……………………………………………………………………………………………………………
3. A hiker travels south along a straight path for 1.5 h with an average speed of 0.75 km/h and
then travels north for 2.5 h with an average speed of 0.90 km/h .What is the hiker’s
displacement for the
totaltrip?………………………………………………………………………………………………
…………………………………………………………………………………………………………
……………………………………………………………………………………………………….…
4. What is the magnitude of the displacement of a windup toy that starts its motion from any
position and returns to that position?
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
5. What quantity describes the difference between an object’s initial position and the object’s
final position?
..................................................................................................................................................
.................................................................................................................................................
6. What is the ratio of an object’s displacement to the time interval during which the
displacement occurred?
…………………………………………………………………………………………………………
…………………………………………………………………………………………………………
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