Mechanical Advantage and Efficiency

Susan and Jake’s truck gets stuck in the mud. They used a tree branch as a lever to lift the truck out of the mud. They applied a force of 900N to the branch and the back of the truck lifted with 3600N of force. What is the mechanical advantage of the tree branch lever?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS2-1

What is the mechanical advantage of the pulley on the flagpole if the input force to raise the flag is 50N and the pulley exerts a 150N force?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-ETS1-2

What is the output force of a screwdriver that has an input force of 45N and a mechanical advantage of 4.75?

• 213.75N

• 200N

• 225N

• 210N

A pulley has an output force of 125 N and a mechanical advantage of 5.15. What is the input force on the pulley?

• 24.27 N

• 25.00 N

• 26.21 N

• 27.18 N

Tags

NGSS.HS-PS2-1

5. What is the output force of a pair of pliers that have an input force of 63 N and a mechanical advantage of 7?

• 441 N

• 9 N

• 70 N

• 10 N

Mr. Blose used a crowbar to lift boards off of his deck. Mr. Blose exerted 235 J of work on the crowbar, the crowbar’s output was 220 J of work. What is the efficiency of the crowbar?

• 9.3%

• 106%

• 94%

7. A pulley produces 185 J of work when 320 J of work is exerted on the pulley. What is the efficiency of the pulley?

• 57.81%

• 60.00%

• 75.00%

• 80.00%

8. A lever has an efficiency of 78% and an input work of 475 J. What is the output work of the lever?

• 370.5 J

• 370 J

• 371 J

• 372 J

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

9. A hammer has an output work of 144 J and an efficiency of 90%. What is the input work on the hammer?

• 160 J

• 144 J

• 130 J

• 100 J

Tags

NGSS.MS-PS3-4

10. A door knob has an output work of 4 J of work when 12.8 J of input work is done. What is the efficiency of the door knob?

• 31.25%

• 25%

• 50%

• 75%