Exam 1 Review Question Preview (ID: 55562)

Kinematics, Forces, Work, Power, Energy Quick, Calculation-type Questions.

If a force is perpendicular to the motion of some object, then the work done by that force is...
a) Positive
b) Zero
c) Negative
d) Not enough information

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) 28 m/s
c) 12 m/s
d) 32 m/s

What is the spring constant of a spring that has a potential energy of 2000 J when it is compressed y 25 cm?
a) 6400 N/m
b) 460 N/m
c) 64000 N/m
d) 4600 N/m

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) 67.8 m/s
b) 6.78 m/s
c) 7.86 m/s
d) 8.67 m/s

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) 1715 J
b) 1570 J
c) 7510 J
d) 1075 J

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) 12.2 m/s
d) 21.2 m/s

Which of the following is FALSE
a) Work done by friction is always negative.
b) Non-conservative work is equal to a change in potential energy
c) Total work is equal to the change in kinetic energy
d) Physics is super cool

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) 0.69 m/s/s
d) 0

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) 26 m
b) 16 m
c) 6.1 m
d) 61 m

Which statement is TRUE
a) Kinetic energy is the energy associated with position
b) Weight is a force
c) Gravity always does negative work
d) Physics is just plain awful

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