Unit 4 Chapter 3: Types of Machines

Mechanical Advantage compares the load force to the load distance.

• False - it compares the resistance force to the effort force

• True

• False - it compares the work to the distance

A screw is a modified form of an inclined plane.

• True

• False - it is a modified wedge

• False - it is a modified levee

In a pulley system the mechanical advantage can be determined by counting the number of ropes supporting the load.

• True

• False - it is determined by the number of pulleys.

• False - it ropes have nothing to do with mechanical advantage

Efficiency compares the resistance force and the effort force.

• True

• False - it compares the ratio of work output to work input

• False - it measures the net force

Wheels with interlocking teeth

• pulleys

• screws

• gears

The point at which a lever pivots

• fulcrum

• screw

• wedge

Device that makes work easier by changing the size or direction (or both) of a force

• Machine

• Wedge

• Pulley

A simple machine that consists of an inclined plane wrapped around a cylinder.

• Wedge

• Lever

• Screw

• Gear

A simple machine that consists of two inlcined planes back-to-back

• Lever

• Wedge

• Pulley

• Fulcrum

A simple machine consisting of a rigid bar that pivots at a fixed point.

• Wedge

• Lever

• Screw

• Gear