1. Simple Machines

2. Simple Machines Machines are tools that make jobs easier by:
Changing the size of the force
Changing the direction of the force
Increasing the speed or distance the object is moved

3. Simple Machines
Inclined
Plane
Wedge
Screw

4. Simple Machines
Lever
Pulley
Wheel
& Axle

5. Mechanical Advantage
Mechanical Advantage (MA) is the number of times a machine multiplies the force being applied
Ideal mechanical advantage (IMA) is the number of times the applied force is multiplied under ideal conditions. This assumes no friction!

6. Mechanical Advantage
Actual mechanical advantage (AMA) is the number of times the applied force is multiplied under real conditions

7. Calculating IMA
We can calculate IMA for simple machines with this formula.
Where dE is the distance of effort and dR is the distance of resistance.

8. Calculating IMA For a ramp 10m long and 2m high: dE=ramp length=10m
dE=ramp length=10m
dR=
ramp
Height=2m

9. Calculating AMA

10. Calculating AMA

11. Efficiency
Efficiency tells us how efficent a machine is and is expressed as a percent.
Efficiency = WOut/Win x 100 OR
Efficiency = AMA/IMA x 100

12. Efficiency