Transcript The gravitational PE of an object is proportional to

The gravitational PE of an object
is proportional to
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•
A.
B.
C.
D.
The object’s mass and its speed
The object’s speed and its height
The object’s mass and its height
The object’s mass and the square of
its speed
Answer: C
A ball is thrown straight upward.
At the top of the ball’s flight,
• A. The ball’s kinetic energy is at its
maximum value.
• B. The ball’s PE is at its minimum
value
• C. The ball’s PE is equal to its KE
• D. The ball’s KE is zero
Answer: D
The energy stored in a stretched
rubber band is an example of
• A.
• B.
• C.
• D.
Gravitational PE
Elastic PE
Kinetic Energy
Heat Energy
Answer: B
Mechanical Energy is:
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A.
B.
C.
D.
The sum of all energies
The sum of KE and PE
The product of all energies
The product of KE and PE
Answer: B
During the summer, Janice mows
the lawn every week. While she is
pushing the lawn mower, which of
the following forces does negative
work on the mower?
A.
B.
C.
D.
The force of gravity
The upward force of the ground
The force of friction
The force of Janice pushing the
mower.
Answer: C
The period of a simple pendulum
depends on its
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A.
B.
C.
D.
Mass
Length
Total Energy
Velocity at the central position
Answer: B
What is the amount of work
done by the force shown in
this force-displacement
graph?
A.
B.
C.
D.
Answer: D
16 J
35 J
54 J
77 J
F(N)
35 N
d(m)
2.2 m
Two spheres roll across the
floor. Sphere A moves twice as
fast as sphere B, and sphere A
has half the mass of sphere B.
The KE of sphere A is
Answer: A
A.
B.
C.
D.
Twice the KE of sphere B
The same as the KE of sphere
Half the KE of sphere B
Four times the KE of sphere B
You throw a stone horizontally
from a bridge, and it falls toward
the river 10 m below. Which of
the following quantities increases
during the first second after you
release the stone?
A.
B.
C.
D.
The elastic PE of the stone
Answer: B
The KE of the stone
The gravitational PE of the stone
The Total Mechanical energy of the stone
Using ground level as the
reference level, the gravitational
PE of a ball held at a height of 6.0
meter is 12 J. The ball is dropped
from that height and falls toward
the ground. After the ball has
fallen 4.5 m, its KE is • A. 3 J
Answer: C
• B. 6 J
• C. 9 J
• D. 12 J
You lift a bag of onions with a
mass of 1.4 kg from the floor to a
shelf in the cupboard 1.7 m above
the floor. What is the change in
the gravitational PE of the bag of
onions?
• A. 2.4 J
Answer: D
• B. 3.1 J
• C. 12 J
• D. 23 J
Joseph uses a rope to pull a concrete
block across the floor. He holds the
rope at an angle of 250 with the floor
and uses a force of 350 N to pull the
block 7.5 m. How much work is done
on the block?
Answer: B
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A.
B.
C.
D.
188 J
2.4 kJ
2.6 kJ
8.8 kJ
A spring with an elastic constant
of 196 N/m oscillates up and down
with a 1.00 kg mass attached to it.
Its period will be approximately
Answer: C
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A.
B.
C.
D.
0.032 sec
0.071 sec
0.45 sec
4.5 sec
A 1 kg ball starts from rest and
rolls down a frictionless inclined
plane that is 2.5 m long and 1.4 m
high. What is the ball’s speed
when it reaches the bottom of the
incline?
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A.
B.
C.
D.
3.7 m/s
5.2 m/s
7.0 m/s
8.5 m/s
Answer: B
When a 1.00 kg MASS is
suspended from a spring, the
spring stretches by 0.050 meters.
The elastic constant for this spring
is
Answer: D
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A.
B.
C.
D.
0.20 N/m
1.96 N/m
49 N/m
196 N/m