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Exam 1 Review
Test Description: Kinematics, Forces, Work, Power, Energy Quick, calculation-type questions
Instructions: Answer all questions to get your test result.
1) How much work is done by friction when a 50 kg object is pulled 7 m along a horizontal surface? (assume 0.5 for the coefficient of friction)
A
1075 J
B
1715 J
C
7510 J
D
1570 J
2) A ball is thrown at an angle of 30 degrees above the horizontal with an initial velocity of 12 m/s. How fast is the ball when it is 5 m in the air? (Ignore air resistance)
A
6.78 m/s
B
7.86 m/s
C
8.67 m/s
D
67.8 m/s
3) What is the spring constant of a spring that has a potential energy of 2000 J when it is compressed y 25 cm?
A
4600 N/m
B
64000 N/m
C
6400 N/m
D
460 N/m
4) A 1000 kg car is initially going at 38 m/s when it hits a gravel road that is 25 m long. If the friction force on the car is 3000 N, then what is the final velocity?
A
36 m/s
B
32 m/s
C
12 m/s
D
28 m/s
5) If a force is perpendicular to the motion of some object, then the work done by that force is...
A
Not enough information
B
Negative
C
Positive
D
Zero
6) A Net Force acts on an 80 kg object with 600 N in the positive x-direction. If the object is pushed 30 meters from rest, what is the final velocity?
A
122 m/s
B
2.21 m/s
C
21.2 m/s
D
12.2 m/s
7) Which of the following is FALSE
A
Non-conservative work is equal to a change in potential energy
B
Physics is super cool
C
Work done by friction is always negative.
D
Total work is equal to the change in kinetic energy
8) Find the acceleration of a 13 kg object which is pulled to the right with a 50 N tension force and pulled upward with a 75 N tension force. Bonus points for indicating direction
A
6.9 m/s/s
B
9.6 m/s/s
C
0
D
0.69 m/s/s
9) Five workers use 100 N of force to push a 6000 kg object across a frictionless floor. If they do 8000 J of work on the box, how far did they push it?
A
6.1 m
B
16 m
C
26 m
D
61 m
10) Which statement is TRUE
A
Kinetic energy is the energy associated with position
B
Physics is just plain awful
C
Gravity always does negative work
D
Weight is a force
*select an answer for all questions
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