Work – Quiz Questions – Chapter 13

pp. 431 – 432

1. Define the word “WORK.”

2. Are you doing “work” when an object is not moving?

3. What is the formula to determine work?

4. In the formula for work, what unit of measurement is used for FORCE?

5. What is the SI unit for work?

6. One Newton lifted one meter = how many units of work?

7. If you are given the mass of an object and the distance it is moved, what would the resulting formula for work be?

8. You are standing in the gym holding a set of barbells above your head. Are you doing any work?

9. Three children are struggling to move a large rock, After much effort, they manage to move the rock one centimeter. Have they done any work?

10. A machine takes 50 units of work to lift an 8 Newton rock 5 meters. How many units of work are expended as heat?

Power – Quiz Questions – Chapter 13

pp. 433 - 434

1. Define the word “POWER.”

2. Give the formula for power.

3. Power is measured in what unit?

4. One unit of power is the amount needed to do …….

5. What is the formula for POWER if a word problem includes FORCE, DISTANCE, and TIME?

6. What is the unit of measurement for WORK?

7. Would your power output increase or decrease if you walked up a set of stairs faster?

8. Would your power output increase or decrease if you carried a set of books weighing 20 Newtons up the stairs in the same amount of time as in question #7?

9. While rowing across a lake during a race, John does 3960 Joules of work on the oars in 60 seconds. What is his power output?

Mechanical Advantage – Quiz Questions – Chapter 13

pp. 434 - 437

2. Can an inclined plane have a mechanical advantage of less than one? Why or why not?

3. What is the mechanical advantage of a single fixed pulley?

4. What is the mechanical advantage of a pulley system with 4 supporting strands?

5. What is the mechanical advantage of a single MOVEABLE pulley?

6. In many of our labs we used a Force Produced and Force Applied to derive Mechanical Advantage. What is the formula?

7. Is it any advantage to use a machine that has a mechanical advantage of less than one?

8. A ramp at ANY ANGLE must have a mechanical advantage greater than what?

9. You have access to a short, steep ramp and a long, gradual ramp. Obviously, they require different amounts of effort to move a heavy object up each ramp. Compare the WORK done by the two ramp systems.

10. In our levers lab it was suggested that it is possible to lift a car with your little finger. Explain the lever system that would make this possible.

Simple Machines – Quiz Questions – Chapter 13

pp. 438 - 443

1. List the 6 simple machines.

2. Give an example of a first class lever.

3. Give an example of a second class lever.

4. Give an example of a third class lever.

5. What is the mechanical advantage of a single fixed pulley?

6. What is the mechanical advantage of a pulley system with 3 supporting strands?

7. What is a COMPOUND MACHINE?

8. Name three compound machines.

9. How does an inclined plane change the force required to do work?

10. How does a pulley system change the force required to do work?

11. Does a single fixed pulley do the same amount of work as a double fixed and double moveable system with 4 supporting strands?

Energy – Quiz Questions – Chapter 13

pp. 444 - 452

1. Define energy.

2. Define potential energy.

3. Define kinetic energy.

4. What is the formula for determining potential energy?

5. What is the formula for determining kinetic energy?

6. Using PE for potential energy, and KE for kinetic energy, list the PE and KE for a roller coaster car at the top of its first hill and then at the bottom of the hill.

7. What type of energy is found in a match before it is struck?

8. Define mechanical energy.

9. What organism is able to turn light energy into chemical energy?

10. Explain the energy transformation when wood is burned.

11. Water storage tanks are usually built on towers or hilltops. Why?

Conservation of Energy – Quiz Questions – Chapter 13

pp. 453 - 457

1. Define the Law of Conservation of Energy.

2. If the Law of Conservation of Energy is true, how could a girl’s second bounce on a trampoline be higher than her first?

3. A tennis ball is allowed to bounce on a table top. Each bounce is lower and lower. Why aren’t all the bounces the same height?

4. Describe the energy changes as a car goes from the top of a roller coaster hill to the bottom.

5. You have a coat hanger in your hand. You bend it back and forth 10 times and then feel the bent area. It feels hot to the touch. Describe the energy transformation that has occurred.

6. Can a roller coaster car start on a hill that is 20 meters high and make it up to the top of a second hill that is 40 meters high? Why or why not?

Efficiency – Quiz Questions – Chapter 13

pp. 459 - 461

1. What is a perpetual motion machine?

2. Define the word “EFFICIENCY.”

3. What is the formula for efficiency?

4. Efficiency is measured in what unit?

5. Why is no machine 100% efficient?

6. Why do all machines need energy input?

7. You are on a swing. Occasionally you need a push to keep going. Why?

8. In an experiment you roll a ball down a ramp and measure Potential and Kinetic Energy. You find that the values for kinetic energy are always just a little less than the values for potential energy. Did you do the experiment wrong? Why or why not?

Summary   Quiz Questions – Chapter 13

p. 465

1. What is Work?

2. What is POWER?

3. What do machines do to forces?

4. List the 6 simple machines.

5. All levers have one thing in common. What is it?

6. Inclined planes turn a small input force into a ………

7. How many simple machines are contained in a compound machine?

8. What happens to ENERGY when WORK is done?

9. Potential energy results from what?

10. Kinetic energy is dependent on two factors. What are they?

11. At what level does nonmechanical energy occur?

12. Can energy readily change from one form to another?

13. Can energy be created?  Can it be destroyed?

14. Can a machine do more work than the amount of work required to operate it?