1. General Science Chapter 5
Work and machines
General Science
Chapter 5

2. What is Work? Labor Work Cleaning Cooking Laundry Homework
Moving the lawn -

3. Measuring Work 1) Measure force 2) Measure distance Work = -
- = Joules

4. Measuring Work Example
Maria pushed her bike for 10 meters at a force of 2 newtons.
How much work did she do?
Work = -

5. Force, Distance and Work-
Work = -
Force = -
Distance = -

6. Simple Machines - Levers Pulleys Inclined plane Screws Wedge
Wheel and Axle

7. Levers -
Effort force-
Resistance force- the force applied to the lever by the object
3 types
First-Class
Second Class
Third Class

8. Types of levers:

9. Mechanical Advantage Simple machines - The machine
Mechanical advantage = the number of times the machine multiplies your force
Machine force/your force = mechanical advantage

10. Other Simple Machines
Pulley-
Inclined Plane- a.k.a. a ramp
Screw-

11. More Simple Machines
Wedge
Wheel and Axle-
used in cars and door knobs