Simple Machines 1

What are the units of force?

• Kilograms and Newtons

• Just Newtons

• Newtons and Pounds

• Kilograms and Pounds

Which of the following simple machines likely has the least efficiency?

• Wheel and Axle

• Pulley

• Wedge

• Screw

Which class of lever has the fulcrum in the middle (between Fe and Fr)?

• 1

• 2

• 3

• 4

In a wheel and axle, how do we know which is the wheel and which is the axle?

• We guess

• The wheel has the larger diameter/radius

• The axle is better greased

• The wheel is the one that looks like it would roll better

IMA = L/H

Which simple machine(s) does this equation apply for?

• Lever

• Wheel and Axle

• Inclined Plane

• Inclined Plane and Wedge

What is the IMA of this block and tackle?

• 2

• 3

• 4

• 5

How many movable pulleys are in this block and tackle?

• 1

• 2

• 3

• 4

What is the IMA of this wheel and axle?

• 5

• 1/5

• 10

• 1/10

What is the ideal effort force for this wheel and axle?

• 1 N

• 5 N

• 50 N

• 10 N

Brain Break!

• This is the correct answer.

• Do not pick this one.