IPC Chapter 4 Lesson 1 Quiz

________ is a measure of how much of the work put into a machine is changed to useful work put out by the machine.

• Work

• Efficiency

• Speed

What is the purpose of a machine?

• Increase your speed

• increase your efficiency

• make it easier to do the job

• all of these

If the work is constant and the distance is decreased, how will the force be affected?

• It remains the same

• It increases

• It decreases

A boy holding heavy bags begins to walk forward. Is work being done by his arms?

• Yes

• No

What is a device that does work with only one movement and changes the size or direction of a force?

• Simple machine

• Compound machine

What is a lever with a mechanical advantage greater than 1 is used to do?

• Increase force

• Increase distance

Machines make tasks easier by changing either the magnitude or the direction of what?

• velocity

• energy

• force

• work

When a machine is used to perform a task, work output is always ________ than work input.

• less

• more

• the same

To calculate mechanical advantage, you divide the _______ force by the input force.

• output

• input

• total

What labs did we do this week?

• Mechanical Efficiency and Advantages & the Pulley

• Mechanical Efficiency and Advantages & the Catapult

• Pulleys & Catapult