These Sample Quiz Questions are provided to give you some idea of the types of questions that could be asked on your Problems Lab quiz covering this material. It in no way promises that the material on your quiz will be the same as that covered here. The quizzes are written by the individual Problems Lab instructors! Nevertheless, if you are prepared for the quiz, you should be able to answer the questions below.
A rock of mass 2.1 kg is thrown with a speed of 7.2 m/s at an angle of 29o above the horizontal from a height of 3.4 m above the ground. The rock flies through the air and hits the ground.
1. What was the initial potential energy of the rock relative to the ground?
a. 9.8 J b. 15.7 J c. 57 J d. 70 J e. 95 J
2. What was the initial kinetic energy of the rock?
a. 13 J b. 28 J c. 54 J d. 85 J e. 110 J
3. What is the initial mechanical energy of the rock?
a. 32 J b. 55 J c. 124 J d. 152 J e. 175 J
4. What is the mechanical energy of the rock at the final point when the rock reaches ground level (but hasn’t hit ground) if air resistance can be neglected?
a. 0 J b. 38 J c. 77 J d. 124 J e. 155 J
5. What is the final potential energy of the rock as it reaches ground level?
a. 0 J b. 7.2 J c. 12 J d. 22 J e. 35 J
6. What is the final kinetic energy of the rock?
a. 0 J b. 59 J c. 124 J d. 187 J e. 210 J
7. What is the final speed of the rock if air resistance can be neglected?
a. 7.5 m/s b. 11 m/s c. 17 m/s d. 22 m/s e. 35 m/s
8. Let’s say that the actual speed of the rock the instant before it hits the ground is measured to be 8.9 m/s . How much energy was lost to air resistance (a non-conservative force!) as the rock flew through the air?
a. 5.2 J b. 9.5 J c. 13 J d. 27 J e. 41 J
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