Introduction to Machines Answers

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?

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?

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?

Students in Ms. Delgado’s science class built machines. They measured the input and output forces. The results of four students are listed in the table. Which lists the students in order from student whose machine has the least mechanical advantage to student whose machine has the greatest mechanical advantage?