Introduction to Levers

A machine is a system of _______.

• Pulleys

• Mechanisms

• Gears

• Widgets

The three common types of mechanisms are levers, _______, and inclined planes.

• Chains

• Gears

• Wheels

• Crowbars

Which of the following is one of the six mechanism safety rules?

• Use your left hand to operate the motor switch

• Remove the back cover of the panel

• Keep your work area safe and clean

• Do not remove the fuse cover

A force can be defined as a(n) ________ or ________.

• Push or shove

• Pull or tug

• Shove or tug

• Push or pull

The English unit of measurement of weight is the ________.

• Pound-mass (lb-m)

• Foot-pound (ft-lb)

• Pound-force (lb-f)

• Inch-pound (in-lb)

The English unit of measurement of mass is ________.

• Pound-mass (lb-m)

• Foot-pound (ft-lb)

• Pound-force (lb-f)

• Inch-pound (in-lb)

To calculate the weight of an object, you need to know the mass of the object and the _______.

• Circumference of the object

• Gravitational acceleration of the Earth

• Diameter of the object

• All of the above

Hooke's Law states: The _______ of an elastic material is directly proportional to the applied force.

• Hardness

• Elasticity

• Deformation

• Softness

A spring scale is used to measure _______.

• Force

• Mass

• Weight

• Volume

A ______ is a bar or beam atop a fulcrum that is used to transmit force from one point to another.

• Wheel

• Widget

• Inclined plane

• Lever