# Exam 1 Review Question Preview (ID: 55562)

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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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To play games using the questions from above, visit ReviewGameZone.com and enter game ID number: 55562 in the upper right hand corner or click here.

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