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WorksheetsWork, Power, Efficiency, Simple Machines, & MA
Total questions: 21
Worksheet time: 1hrs 23mins
Efficiency is a measure of how much of the work put into a machine is converted into useful output work. Why can efficiency never reach 100%?
acceleration
elasticity
friction
gravity
An inclined plane wrapped around a rod forms this simple machine
lever
pulley
wedge
screw
Calculate the amount of work done if you use a 100N force to push a 50kg box 5m across the kitchen floor.
250 J
500 J
5000 J
50,000J
If a machine exerts a force of 250 N on an object and no work is done, what must have occurred?
The machine has broken
The object has not moved
The object has gained momentum.
The object has moved, but then stopped
A man has an air conditioner he wants to load into the back of his truck. Instead of lifting the air conditioner and carrying it to the truck, he improvises a ramp. He takes a board that is 3.6 meters long and places one end of it in the back of his truck, 1.2 meters off the ground. He leaves the other end of the board on the ground. He places the air conditioner on a dolly and pushes them both up the ramp and into the truck. What is the mechanical advantage of the ramp?
3.0
2.5
4.32
4.8
What is evidence that work is being done?
A machine is used.
The man exerts a force.
A simple machine makes work easier.
The man exerts a force and moves the load.
What is the mechanical advantage of the block and tackle used to lift the bale of cotton?
1
2
3
4
Where should the fulcrum be located in this lever to get the greatest mechanical advantage?
at position I, because the length of the effort arm should be greater than the length of the load arm
at position II, because the effort arm and the load arm should have equal lengths
at position III, because the length of the load arm should be greater than the length of the effort arm
at position IV, because the effort should be applied as close to the fulcrum as possible
What simple machines are used to create the shovel?
Wheel and axle
Wedge and inclined plane
Screw and inclined plane
Lever and wedge
Which two simple machines are found in a pair of scissor?
screw and lever
lever and wedge
screw and inclined plane
pulley and ramp
Which class lever is presented in the picture?
1st class
2nd class
3rd class
4th class
Which class lever is presented?
1st slass
2nd class
3rd class
4th class
What would the blue triangle in this image be referred to as?
Input force
Output force
efficiency point
None of the these options are correct
Which class lever is presented in the picture?
1st class
2nd class
3rd class
4th class
Starting at the barrel (point of contact), identify the 3 points of the lever presented.
Resistance force, effort force, fulcrum
Effort force, resistance force, fulcrum
effort force, fulcrum, Resistance force,
Resistance force, fulcrum, effort force
When gasoline is burned in a car engine, ________ energy is converted into _________ energy.
heat, chemical
chemical, potential
mechanical, chemical
chemical, mechanical
Which example involves the transformation of chemical energy directly into light energy?
Predict the energy trend as a substance changes from a solid to liquid to gas on this graph.
It would increase from bottom left to top right.
It would decrease from top left to bottom right.
It would be a horizontal line as energy would remain constant.
It would increase from solid to liquid, then decrease from liquid to gas.
A golf ball with a mass of 0.05 kg travels down the fairway with a velocity of 60.0 m/s. Calculate the kinetic energy of the golf ball.
0.075 Joules
1.5 Joules
90 Joules
180 Joules
Up a hill
down a hill
up a hill and then rolling back down the other side
down a hill and then rolling back up the other side.
Yours friends are in a debate over who does the most work. In which situation is the most work being done?
Jesse hauls 9 kg bags of mulch 300 m with an average force of 90 N.
Stella mops the restaurant with an average force of 60 N for 250 m.
Peyton pushes his lawnmower with an average force of 75 N for 500 m. The lawnmower weighs 10 kg.
Addie stocks 10 kg boxes of cans on the shelves of the grocery store with an average force of 30 N for a total of 1km.
