MSSC Mechanical Principals

A mechanism refers to __________.

• Machine components only

• Only components with a drive system

• Both parts and a complete machine

• Only a complete machine

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

• Wheels

• Chains

• Gears

• 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.

The metric system expresses force in __________.

• Lb-f

• Newtons

• Newtons per gram

• Pounds

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)

Mass is the __________.

• Amount of material in an object

• Weight of an object

• Size of an object

• Volume of an object

A spring scale is used to measure __________.

• Force

• Mass

• Torque

• Rotary Movement

A force that makes an object rotate about a point is called __________.

• Torque

• Leverage

• Pivot Force

• Fulcrum

Torque is calculated by multiplying a force times __________.

• A distance

• The diameter of the load

• The load's mass

• The circumference

The Law of Moments can be used to determine __________.

• How much force is needed to balance a load

• How much force is needed to move a load

• The speed of a movement

• Both the force needed to balance or force needed to move a load