Grade 10 Physics
Chapter 18 Test
Name: ____________________________
Class: _____________
1. Which one of the following is a correct definition of displacement?
2.
A.
Distance from a fixed point
B.
Distance moved from a fixed point
C.
Distance from a fixed point in a given direction
D.
Distance moved in a given direction
Which of the following is a correct definition of average acceleration?
A.
change in velocity
time taken
B
velocity
time taken
C.
change in speed
time taken
D.
speed
time taken
3. The diagram below shows the variation with time t of the velocity v of an object.
v
0
t
0
The area between the line of the graph and the time-axis represents
A.
the average velocity of the object.
B.
the displacement of the object.
C.
the impulse acting on the object.
D.
the work done on the object.
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4. The graph below shows the variation with time t of the acceleration a of a body moving in a straightline.
a
0
0
t1
t2
t
The shaded area represents
A.
the change in velocity from t1 to t2.
B.
the velocity at t2.
C.
the average velocity between t1 and t2.
D.
the velocity at t1.
5. Which is true about uniformly accelerated motion?
A. The acceleration increases with time.
B.
The velocity remains constant.
C. The distance covered per time is constant.
D. The distance covered per time increases at a constant rate.
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6. Given below is the position-time graph representing motions of two runners, Nick and Ian. Use this
graph to determine which runner has greater average velocity.
[3]
10
9
8
Ian
Position (m)
7
6
Nick
5
4
3
2
1
1
2
3
4
5
6
7
8
9
10
Time (s)
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7.
The graph below shows how the velocity of a rolling ball changes with time. USE THE GRAPH to
calculate the acceleration of the ball.
[3]
v (m/s)
10
9
8
7
6
5
4
3
2
1
2
4
6
8
10
12
14
16
18
t (s)
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8.
Barry ran from rest at an acceleration of 5 m/s2 for 3 seconds. He then walked at a constant speed
for 8 seconds. Finally he slowed down till he came to rest in 5 seconds.
a- Sketch a velocity-time graph of his motion.
[5]
b- Use the graph to find the distance covered during deceleration.
[2]
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------c- Find his average velosit during the whole journey
[4]
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9. Michael Johnson won the 200m at the 1996 Olympic Games in a new World record time of 19.32s.
(a) Calculate his average speed
________________________________________________________________________________
(b) He reached a velocity of 7.5 m/s in 2 seconds after the start of the race. How far had he run in
the first 2s? (You may assume he accelerates at a constant rate.)
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[2]
[2]
______________________________________________________________________________
(c) What was his average acceleration 2s after the start of the race?
[2]
________________________________________________________________________________
________________________________________________________________________________
(c) Sketch a graph describing his motion.
[2]
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