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Exam 2
Problem 1
Description:
The figure shows an accelerationversusforce graph for three objects pulled by rubber
bands. The mass of object 2 is 0.11 kg.
.
Part A
What is the mass of object 1?
ANSWER:
M
1
=
Part B
What is the mass of object 3?
ANSWER:
M
3
=
Part C
Explain your reasoning.
Essay answers are limited to about 500 words.
ANSWER:
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View Full Document Problem 2
Part A
A car has a maximum acceleration of 6.8 m/s
2
. What will the maximum acceleration be if the car is
towing another car of the same mass?
ANSWER:
a =
Problem 3
The figure shows two forces acting on an object at rest.
Part A
Redraw the diagram, then add a third force that will cause the object to remain at rest. Label the new
force
F
3
..
Draw the force vector with its tail at the dot.
ANSWER:
Problem 4
Your car is accelerating to the right from a stop.
Part A
Identify all forces acting on the object and draw the freebody diagram.
Draw the force vectors with their tails at the dot. The orientation of your vectors will be
graded. The exact length of your vectors will not be graded but the relative length of one to
the other will be graded.
ANSWER:
Problem 5
A person on a bridge throws a rock straight down toward the water. The rock has just been released.
Part A
Draw a freebody diagram.
Draw the force vectors with their tails at the dot. The orientation of your vectors will be
graded. The exact length of your vectors will not be graded but the relative length of one to
the other will be graded.
ANSWER:
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View Full Document Problem 6
A constant force is applied to an object, causing the object to accelerate at 10 m/s
2
.
Part A
What will the acceleration be if the force is halved?
ANSWER:
a =
Part B
What will the acceleration be if the object's mass is halved?
ANSWER:
a =
Part C
What will the acceleration be if the force and the object's mass are both halved?
ANSWER:
a =
Part D
What will the acceleration be if the force is halved and the object's mass is doubled?
ANSWER:
a =
Problem 7
A skier is sliding down a 15
o
slope. Friction is not negligible.
Part A
Identify the forces on the skier.
ANSWER:
Problem 8
A football player at practice pushes a 70 kg blocking sled across the field at a constant speed. The
coefficient of kinetic friction between the grass and the sled is 0.30.
Part A
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This note was uploaded on 07/11/2011 for the course PHYS 225 taught by Professor Bacon during the Summer '09 term at Ferris State.
 Summer '09
 BACON

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