2.1 Simple Machines

Select all possible main functions of machines.

• change energy from one form to another

• transfer forces

• change direction of force

• change magnitude of force

• change distance or speed

Select all types of simple machines.

• lever family

• inclined family

• declined family

• rotation family

• combustible family

What is the difference between a fulcrum and a lever?

• A fulcrum is the pivot point, and a lever is the bar that rotates around it.
• A fulcrum is used in construction, and a lever is used in cooking.
• A fulcrum is stationary, and a lever moves.
• A fulcrum is the handle, and a lever is the base.

What is the difference between an effort force and an effort arm?

• An effort force is used in physics, while an effort arm is used in biology.
• An effort force is measured in kilograms, while an effort arm is measured in meters.
• An effort force is the force applied to move an object, while an effort arm is the distance between the point where the force is applied and the pivot point.
• An effort force is a scalar quantity, while an effort arm is a vector quantity.

True or False?

The load force is the force that a load exerts on a lever.

• True

• False

What type of lever is this?

• first class lever

• second class lever

• third class lever

What kind of lever is this?

• first class lever

• second class lever

• third class lever

What kind of lever is this?

• first class lever

• second class lever

• third class lever

Select all members of the lever family.

• pulley

• wheel & axle

• gears

• inclined plane

• screw

Select all that are used by bikes.

• pulley

• gears

• wheel & axle