Physical Science Unit 3 Review

A force of 30 N is applied to a screwdriver to pry the lid off of a can of paint. The screwdriver applies 95 N of force to the lid. What's the MA?

• 3

• 3.5

• 3.1

• 3.2

A force of 65 N is applied to a screwdriver to pry the lid off of a tuna can. The screwdriver applies 105 N of force to the lid. What's the MA?

• 1.6

• 1.5

• 1

• 2

What is the equation to find MA for a wedge?

• $MA=N$

• $MA=\frac{L_e}{L_r}$

• $MA=\frac{L}{W}$

• $MA=\frac{W}{L}$

If the output work is 5 and the input work is 7, what is the mechanical efficiency?

• 35

• 71

• 75

• 140

Select all the answers that are simple machines.

• Motorcycle

• Pulley

• Nail

• Inclined Plane

• Lever

What is the equation for power?

• $P=\frac{F}{d}$

• $P=F\cdot d$

• $P=\frac{t}{W}$

• $P=\frac{W}{t}$

If the output force is 12 and the input force is 2, what is the mechanical advantage?

• 6

• 3

• 24

• 4

A machine is a device that _______________________________.

• Transfer energy through motion

• Makes work easier

• Can get work done quickly

• Increases more work

Tags

NGSS.MS-PS3-5

Which person does more work? A girl who lifts a 350 N box in 10 seconds, or a boy who lifts a 200 N box in 10 seconds?

• The girl

• The boy

Which person does more work? A girl who lifts a 500 N box with a distance of 6 m, or a boy who lifts a 500 N box with a distance of 9 m?

• The girl

• The boy

Tags

NGSS.MS-PS3-5