Chapter 3 Lesson 3 (Simple Machines)

What type of machine does work using ONLY MOVEMENT?

• Simple machine

• Compound machine

Which simple machine is made of a bar that pivots or rotates about a fixed point?

• Wheel and axle

• Lever

• Inclined plane

• pully

• screw

What is the POINT that a lever pivots?

• radius

• gear

• fulcrum

• pully

The distance from the fulcrum to the input force is called the _______. The distance from the fulcrum to the output force is called the _______.

• fulcrum

• input arm

• output arm

• radius

What does the ideal mechanical advantage of a lever equal to?

• length of inclined plane/height of inclined plane

• radius of wheel/radius of axle

• length of input arm/length of output arm

In which lever is the fulcrum is between the input force and output force? A see-saw is an example.

• 1st class lever

• 2nd class lever

• 3rd class lever

TRUE or FALSE: The mechanical advantage of a first-class lever can VARY / CHANGE depending on the location ofn the fulcrum.

• True

• False

In a first-class lever, why is the MA always greater that 1?

• The input arm is longer than the output arm.

• The output arm is longer than the input arm.

• The input and output arms are equal.

In which lever is the output force in between the input force and the fulcrum? A wheel barrow is an example.

• 1st class lever

• 2nd class lever

• 3rd class lever

In a second-class lever, why is the MA always greater that 1?

• The input arm is longer than the output arm.

• The output arm is longer than the input arm.

• The input and output arms are equal.