1. Machine problems

2. Ideal Mechanical advantage
What is the ideal mechanical advantage of a wedge that is meters long and 0.05 meters high?

3. Ideal Mechanical advantage
What is the ideal mechanical advantage of a wedge that is meters long and 0.05 meters high?
ideal mechanical advantage = (length of inclined plane) / (height of inclined plane)

4. Ideal Mechanical advantage
What is the ideal mechanical advantage of a wedge that is meters long and 0.05 meters high?
ideal mechanical advantage = (length of inclined plane) / (height of inclined plane)
The ideal mechanical advantage of the wedge is 3.

5. More ideal mechanical advantage
The wheel and axle on a wagon is a simple machine. The radius of the wheel is 0.12 meters. The radius of the axle is 0.03 meters. What is the ideal mechanical advantage of the wheel and axle?

6. More ideal mechanical advantage
The wheel and axle on a wagon is a simple machine. The radius of the wheel is 0.12 meters. The radius of the axle is 0.03 meters. What is the ideal mechanical advantage of the wheel and axle?
ideal mechanical advantage = (radius of wheel) / (radius of axle)

7. More ideal mechanical advantage
The wheel and axle on a wagon is a simple machine. The radius of the wheel is 0.12 meters. The radius of the axle is 0.03 meters. What is the ideal mechanical advantage of the wheel and axle?
ideal mechanical advantage = (radius of wheel) / (radius of axle)
The ideal mechanical advantage of the wheel and axle on the wagon is 4.

8. Efficiency #1
Joe is using a crowbar to remove a tree stump. He applies 2066 J of work to the crowbar. The output work of the crowbar is 1240 J. What is the efficiency of the crowbar?

9. Efficiency #1
Joe is using a crowbar to remove a tree stump. He applies 2066 J of work to the crowbar. The output work of the crowbar is 1240 J. What is the efficiency of the crowbar?
efficiency =

10. Efficiency #1
Joe is using a crowbar to remove a tree stump. He applies 2066 J of work to the crowbar. The output work of the crowbar is 1240 J. What is the efficiency of the crowbar?
efficiency =
efficiency = 60%

11. Lever, with dog

12. Efficiency #2
A dressmaker is cutting fabric. She applies 18 J of work to the scissors. The scissors apply 15 J of work to the fabric as it cuts. What is the efficiency of the scissors?

13. Efficiency #2
A dressmaker is cutting fabric. She applies 18 J of work to the scissors. The scissors apply 15 J of work to the fabric as it cuts. What is the efficiency of the scissors?
efficiency =

14. Efficiency #2
A dressmaker is cutting fabric. She applies 18 J of work to the scissors. The scissors apply 15 J of work to the fabric as it cuts. What is the efficiency of the scissors?
efficiency =
The efficiency of the scissors is 83%.