1. Work & Machines
Thinking Questions

2. Why does work in fail to equal work out for a real machine?

3. Why does work in fail to equal work out for a real machine?
Under ideal conditions, work in equals work out. Under normal conditions, some work in is converted to heat energy, making work out less than work in. For a real machine, work out will always be less than work in.

4. What is the purpose of a machine?

5. What is the purpose of a machine?
Machines make work easier.

6. Describe WORK

7. Describe WORK When a Force causes Motion
Work is the transfer of Energy through motion.

8. What must happen for work to take place?

9. What must happen for work to take place?
A force must be exerted through a distance

10. Work depends on two things. What are they?

11. Work depends on two things. What are they?
The amount of Force (F) exerted.
  The Distance (d) over which the Force is applied.

12. Two factors determine whether work is done. What are they?

13. Two factors determine whether work is done. What are they?
Something has to move.
The motion must be in the direction of the applied Force.

14. How does a Simple Machine make work easier?

15. How does a Simple Machine make work easier?
Transferring the Force from one place to another.
Changing the direction of a Force
  Increasing the magnitude of a Force
   Increasing the distance or speed of a Force