DATE: NAME: CLASS:
BLM 3-24continued
1. A car slows from 18 m/s [S] to 12 m/s [S]. Which of the following correctly describes the
direction of the change in velocity and acceleration?
Change in velocity
/Acceleration
A / [S] / [S]B / [S] / [N]
C / [N] / [S]
D / [N] / [N]
2. Which of the following describes an object that is not accelerating?
A. Only the speed is changing.
B. Only the direction is changing.
C. Both the speed and direction are changing.
D. Neither the speed nor the direction are changing.
3. Acceleration and velocity are related in the same way as
A. velocity and position
B. acceleration and position
C. displacement and position
D. displacement and acceleration
4. The SI unit for acceleration is
A. s2
B. km/h
C. m/s2
D. m/s
5. If a velocity-time graph has zero slope, you can infer that the object being observed
A. is accelerating
B. is moving with uniform velocity
C. is decelerating
D. has zero displacement
6. Which quantity cannot be obtained from a velocity-time graph?
A. the direction of the object’s motion
B. whether the object is accelerating
C. the object’s initial position
D. the velocity of the object
7. What does the slope of a velocity-time graph represent?
A. average velocity
B. average acceleration
C. displacement
D. time interval
Use the following velocity-time graph to answer question 8.
8. The velocity-time graph below suggests that the object is
A. travelling north with a constant velocity
B. travelling south with a constant velocity
C. travelling north with a constant deceleration
D. travelling south with a constant deceleration
9. A ball is thrown straight up into the air and returns to the ground. Positive (+) represents
the upward direction. Which of the following correctly states the ball’s acceleration as it moves freely through the air during the whole journey?
Acceleration while travelling up
/Acceleration while travelling down
A / + / –B / + / +
C / – / –
D / – / +
10. During what time interval is the object, represented by the graph, travelling only east?
A. t = 0 s to t = 10 s
B. t = 10 s to t = 20 s
C. t = 30 s to t = 40 s
D. t = 20 s to t = 40 s
Match the Term on the left with the best Descriptor on the right.Each Descriptor may be used only once.
Term / Descriptor
_____11. acceleration
_____12. change in velocity
_____13. deceleration
_____14. acceleration due
to gravity
_____15. air resistance
_____16. constant acceleration / A. acceleration opposite the direction of motion
B. represented by a straight line on a velocity-time graph
C. 9.8 m/s2 downD. rate of change in velocity
E. rate of change in position
F. final velocity minus initial velocity
G. slows down an object travelling through the air
Short Answer Questions
17.(a) A car accelerates uniformly from rest to 24 m/s [S] in 18 s. What is the car’s
acceleration?
(b) The wind provides an acceleration of 1.5 m/s2 [E]. How long would it take this wind to change the velocity of a windsurfer from 9.0 m/s [W] to 3.0 m/s [E]?
(c) A heavy hammer is accidentally dropped from a roof. What is the velocity of the
hammer 0.75 s after it is released?
Use the following velocity-time graph to answer question 18.
18. The motion of an object is represented by the velocity-time graph. Find the
acceleration of the object during each of the following time intervals.
(a) t = 0.0 s to t = 4.0 s
(b) t = 4.0 s to t = 6.0 s
(c) t = 6.0 s to t = 12 s
19. Describe the motion represented by the following velocity-time graph.
/ ____________
______
______
______
______
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