SPH3U3/6
WORK, POWER & ENERGY
TEST A
MULTIPLE CHOICE
:
Place your answer on the
LEGAL SIZE
paper.
1)
(
1K
) An object with mass
m
and speed
v
0
directed to the right strikes a wall and rebounds
with speed
v
0
directed to the left.
The change in
the object’s kinetic energy is
A)

m
v
0
2
B)

1
2
0
2
m
v
C)
1
2
0
2
m
v
D)
m
v
0
2
E)
0
2)
(
1K
) Each of the four identical carts shown
below is loaded with a total mass of four
kilograms. All of the carts are initially at rest
on the same level surface.
Forces of the same
magnitude directed to the right act on each of the
carts for the same length of time.
If friction and
air resistance are negligible, which cart will have
the greatest velocity when the applied force
stops?
A)
All four carts will have the same velocity.
B)
Cart 1
C)
Cart 2
D)
Cart 3
E)
Cart 4
3)
(
1K
) Alice and Bill are standing at the top of a
cliff of height
H
.
Both throw a ball with initial
speed
v
0
.
Alice throws her ball straight down
while Bill throws his ball straight up.
The
speeds of the balls when they hit the ground are
v
A
and
v
B
respectively and the times that the
balls hit the grounds are
t
A
and
t
B
respectively.
Which of the following mathematical statements
is
CORRECT
?
A)
v
v
A
B
<
B)
v
v
A
B
=
C)
v
v
A
B
D)
t
t
A
B
=
E)
t
t
A
B
4)
(
1K
) A motor having a power rating of 500 W is
used to lift an object weighing 100 N.
How
much time does the motor take to lift the object a
vertical distance of 10 m?
A)
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 Spring '09
 TANNY
 Calculus, Energy, Force, Mass, Potential Energy, LEGAL SIZE paper

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