Simple Machines

Mr. Anderson explains simple machines, starting with a definition of machines and work. He introduces simple machines, their historical context, and the two main types: levers and inclined planes. The video covers mechanical advantage, efficiency, and how simple machines change force direction or magnitude. Examples include levers, inclined planes, and their applications.

What is the scientific definition of work?

• Energy used to create motion

• Force exerted over a distance

• Power applied over time

• Energy stored in an object

Which of the following is NOT considered a classical simple machine?

• Inclined Plane

• Lever

• Hydraulics

• Pulley

What is the primary function of a simple machine?

• To reduce the amount of work needed

• To increase the speed of work

• To change the direction or magnitude of a force

• To store energy for later use

What are the two main types of simple machines?

• Lever and Inclined Plane

• Screw and Wedge

• Lever and Pulley

• Wheel and Axle, and Inclined Plane

How is mechanical advantage calculated for a lever?

• Distance moved by output force divided by distance moved by input force

• Distance moved by input force divided by distance moved by output force

• Output force divided by input force

• Input force divided by output force

What is the main benefit of using an inclined plane?

• It reduces the total work needed

• It allows lifting with less force over a longer distance

• It increases the speed of lifting

• It stores energy for future use

Why can't a simple machine be 100% efficient?

• Because it loses energy to friction and other factors

• Because it always requires more input work than output work

• Because it cannot change the direction of force

• Because it cannot increase the magnitude of force