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Questions and answers by
Colleen Kelley
Questions (15)
In 1–2 sentences, describe an efficient simple machine.
1 answer
429 views
A student uses a pulley to lift a log. In 1–2 sentences, explain how she can calculate the pulley’s efficiency
1 answer
311 views
In 1–2 sentences, explain how to calculate the efficiency of a toaster
1 answer
324 views
Which is the best statement of the Law of Conservation of Energy?
1 answer
225 views
Larry uses a lever to lift a box. Where does inefficiency occur in the lever?
1 answer
417 views
What is the mathematical representation of a machine’s efficiency?
1 answer
284 views
What happens when you use a lever to lift a box?
1 answer
264 views
Mark needs to clean up a broken glass on the floor. He can use a hand brush or a broom. Why should he choose the broom?
1 answer
308 views
Luisa uses a nutcracker to crack walnuts. She has to squeeze the handles 12 centimeters to crack a walnut. The part of the arms
1 answer
365 views
Samantha builds a lever to lift objects in a science experiment. The load arm is 0.4 meters. If she wants the lever to have a
1 answer
310 views
To directly lift a crate 0.6 meters, Joaquin would need to apply 312 newtons of force. Instead, he uses a lever with a
1 answer
322 views
Alan will use a compound pulley to lift a crate from the floor of his garage to a storage shelf. The shelf is 3.5 meters above
1 answer
397 views
Sarah uses an inclined plant to load a chest into her truck. If she does 84 Joules of work, and the inclined plane is 3 meters
1 answer
284 views
Harold uses an inclined plane to move a washing machine from the sidewalk into his house. The vertical distance from the
1 answer
638 views
What equation can you use to calculate the mechanical advantage of a simple machine?
1 answer
365 views
