Introduction to Machines Answers

While researching machines and how they work, Tika finds several online sites that discuss how force and distance are related to work done by a machine.How should Tika most likely describe this relationship between force and distance to her study group?

Jill applies a force of 250 N to a machine. The machine applies a force of 25 N to an object. What is the mechanical advantage of the machine?

What is the mechanical advantage of a machine that applies a force of 1000 N to an object when a force of 500 N is applied to the machine?

A machine has a mechanical advantage of 5. What force should be applied to the machine to make it apply 3000 N to an object?

Which refers to the ratio of output work to input work of a machine expressed as a percent?

Tas watches as his uncle changes a flat tire on a car. His uncle raises the car using a machine called a jack. Each time his uncle pushes down on the jack handle, the car rises up. Tas sketches the jack and labels it using the symbols F, to represent force, and d, to represent distance. He uses large and small letters to compare the sizes of the forces and distances.Which set of labels is correct for the side of the jack that Tas’s uncle pushes on?

Which statement best describes why a machine is useful?

A machine has a mechanical advantage of 4.5. What force is put out by the machine if the force applied to the machine is 800 N?

What is impossible for a machine to do?

Lucy needs to lift a crate to a shelf 20 m high. She does 12,000 J of work on a machine to help her. The machine exerts a force of 500 N to lift the crate.What is the efficiency of the machine?