WorksheetsPhysical Science Unit 3 Review
Total questions: 13
Worksheet time: 7mins
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=LrLe
MA=WL
MA=LW
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=dF
P=F⋅d
P=Wt
P=tW
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
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
What are the two simple machines that are a modified version of the inclined plane?
Wedge and Screw
Screw and Lever
Lever and Pulley
Pulley and Wedge
Which example explains no work being done?
Pushing a lawn mower
Swinging a baseball bat
Lifting a 20 lb weight
Pushing against a locked screen door
The efficiency of a machine can by calculated by which equation?
Eff = W/t
Eff = F * d
Eff = (W in)/(W out) * 100%
Eff = (W out)/(W in) * 100%
