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WorksheetsWork, Power, and Machines
Total questions: 19
Worksheet time: 10mins
What is work?
Work is using a force to make an object change.
Work is when an object moves in the same direction as the applied force.
Work is washing dishes and doing laundry.
Which is an example of scientific work?
Doing a math worksheet
Babysitting a neighbor's child
mowing the lawn
What is FORCE?
Force is energy
Force is what is with Luke Skywalker
Force is a push or a pull
Which are the correct measurement units for Work, Power, and Force?
Work = Newtons (N) Power = Watts (W) Force = Joules (J)
Work = Watts (W) Power = Newtons (N) Force = Joules (J)
Work = Joules (J) Power = Watts (W) Force = Newtons (N)
Simple Machines: A pulley makes work easier by changing the direction of the force so you are pulling with gravity instead of lifting against it.
true
false
A lever makes work easier by changing the direction of the force so that you can push down with gravity instead of lifting up against gravity.
True
False
Simple Machines:
An inclined plane makes work easier by changing the direction of the force.
true
false
Simple Machines:
An inclined plane makes work easier by spreading the force out over a greater distance, so less force has to be applied.
True
False
Can a machine be 100% efficient?
Yes, if it's designed well.
No, because of energy transformation by friction.
Is the penguin doing work as he carries the briefcase?
Yes -- and he's cute too!
No, because he's applying an upward force to the briefcase, but his motion is forward. Work requires the force and motion to be in the same direction.
Is the Pug doing work?
Yes, because the applied force and motion are both forward.
No, because the applied force and motion are not in the same direction.
Is the tortoise doing work?
Yes, because the force and motion are both forward.
No, because the force is upward and the motion is forward. Work requires force and motion to be in the same direction.
Is Mr. Burns doing scientific work?
Yes, he's putting lots of force onto the bowling ball.
No, he's applying force, but there's no motion.
Calculate: Moving a 20kg box 5 meters with a force of 10N requires how much work?
W = force x distance
100N
100J
50N
50J
Calculate: 2000J of work is completed in 10 seconds. What is the power?
Power = work / time
20,000 Joules
200 Joules
20,000 Watts
200 Watts
A box needs to be put onto the truck. Which is true.
It would require less work to lift the box up a few feet off the ground.
It would require less work to slide the box up a ramp that would be a longer distance.
The amount of work would be the same lifting or using the ramp, but the ramp would spread the force out so it feels easier.
What is the science definition of a machine?
machines help us get things done using power
machines make work easier by changing the size or direction of the force
machines make work easier by reducing the amount of work and power
The motorcycle has more power than the tricycle. Which is true if they travel the same distance carrying the same mass?
A) The more powerful motorcycle will do work in less time than the tricycle.
B) The tricycle will do more work because its harder to pedal.
C) They will do the same amount of work.
D) A and C are both true.
Final question:
What is Linus waiting for?
Halloween candy
The Great Pumpkin
Snoopy & Woodstock
Casper the Ghost
