Test Review

Question 1

When like atoms are bonded together chemically, they form…

Answer 1

an element

Question 2

What is the smallest division which can be made in a substance and still retain all the properties of the substance?

Answer 2

A molecule

Question 3

Water is a _______ because water molecules are composed of two kinds of atoms, hydrogen and oxygen.

Answer 3

Compound

Question 4

What is any substance whose molecules are composed of unlike atoms?

Answer 4

A compound

Question 5

When two different elements or compounds are mixed together and the molecules do not combine chemically, the substance is known as a …

Answer 5

Mixture

Question 6

The state of matter is determined by what two things?

Answer 6

Temperature and pressure

Question 7

As molecules of solids are heated, their activity or molecular speed is …

Answer 7

Increased

Question 8

Because there can be no lower temperature than that at which molecular motion ceases, it is called …

Answer 8

Absolute zero

Question 9

There are two kinds of energy:

Potential energy is due to…

Kinetic energy is due to…

Answer 9

The position of a mass

The motion of a mass

Question 10

What is the rate at which work is done?

Answer 10

Power

Question 11

What are the two types of velocity?

Answer 11

Variable and constant.

Question 12

What is the force or shock which results when the movement of a confined liquid is suddenly arrested or accelerated?

Answer 12

Water hammer

Question 13

What are the six types of simple machines?

Answer 13

• The lever
• The inclined plane
• The wedge
• The screw
• The wheel and axle
• The pulley

Question 14

Levers of the third class multiply _______ or _______, rather than force.

Answer 14

Speed, distance

Question 15

If the wheel is the driving axle, there is a loss in ______ because the driving belt is traveling seven times faster and farther than the driven belt on the axle.

Answer 15

Mechanical advantage of speed

Question 16

On simple machines it is impossible to gain both _______ and _______ at the same time.

Answer 16

Force, speed

Question 17

What are the four main functions of a gear system?

Answer 17

• Transmit positive force
• Change direction
• Change speed
• Increase or decrease force

Question 18

With an odd number of gears in a simple gear train, the driver and driven gears rotate …

Answer 18

In the same direction

Question 19

Most screw threads are said to have a definite number of…

Answer 19

Threads per inch

Question 20

The length of the slope of an inclined plane is know as…

Answer 20

The effort distance (ED)

Question 21

Describe a lever.

Answer 21

A rigid bar which turns around a fixed point.

Question 22

Describe an inclined plane.

Answer 22

A slanting surface or ramp used to assist the worker in raising objects against the force of gravity.

Question 23

Describe a wedge.

Answer 23

A tool used to separate or hold.

Question 24

Describe a screw.

Answer 24

A combination of the principles governing the inclined planes, the wedge, and the wheel and axle into one unit.

Question 25

Describe the wheel and axle.

Answer 25

A simple machine consisting of a large handle or circular part which is rigidly secured to a smaller part.

Question 26

Describe a pulley.

Answer 26

A wheel that rigidly fastened to a shaft on which it turns and that transmits motion

Question 27

What are the different classes of levers?

Answer 27

First Class levers: Fulcrum or pivot is located between the effort and resistance force. Second Class Levers: Fulcrum is located on one side of both the effort and resistance forces and the resistance force is in the middle . Third Class Levers: Fulcrum is located on one side of both the effort and resistance forces and the resistance force is at the end.

Question 28

What are the different classes of a wedge?

Answer 28

Class 1 - Separating Wedge: A wedge used to split material. Class 2 - Holding Wedge: A wedge used for its holding power.

Question 29

What are the different categories of a screw?

Answer 29

1. To transmit motion 2. To apply a tremendous amount of force. 3. To hold parts together. 4. To obtain measurements.

Question 30

What are the different classes of the wheel and axle?

Answer 30

Class 1: Transmit force Class 2: Change in speed

Question 31

Give an example of a first class lever.

Answer 31

``` Pliers Crowbar Claw hammer Pickax Wrench Tin snips ```

Question 32

Give an example of a second class lever.

Answer 32

Lower control arm Wheelbarrow Pedal control

Question 33

Give an example of a third class lever.

Answer 33

Arm lifting a weight Fishing pole Shovel

Question 34

Give an example of an inclined plane.

Answer 34

Loading dock

Question 35

Give an example of each of the two types of wedges.

Answer 35

1. Separating Wedge: - Drill Bit Tip - Knife 2. Holding Wedge: - Door Stop

Question 36

Give an example of each of the four categories of a screw.

Answer 36

1. To transmit motion - A drive screw to move a carriage on a lathe 2. To apply a tremendous amount of force - Screw jack 3. To hold parts together - Bolt and Nut 4. To obtain measurements - Threaded interns of a caliper

Question 37

Give an example of each of the two classes of the wheel and axle.

Answer 37

1. Transmit force: - Axle Shaft 2. Change in speed: - Step Pulley - 10 Speed Bicycle

Question 38

Give an example of a pulley.

Answer 38

Timing belt system

Question 39

Define energy.

Answer 39

Capacity to do work

Question 40

Define velocity.

Answer 40

Rate a mass travels in a particular direction.

Question 41

Acts in accordance with the law of free falling bodies.

Answer 41

Gravity

Question 42

A force that resists the relative motion or tendency to such motion of two bodies or substances in contact.

Answer 42

Friction

Question 43

Loss of head at the entrance of a pipe

Answer 43

Turbulence

Question 44

A closed space at which all air has been removed

Answer 44

Vacuum

Question 45

What is viscosity?

Answer 45

Resistance to flow.

Question 46

What is pressure?

Answer 46

Force exerted by a substance on a unit of area.

Question 47

What is power?

Answer 47

The rate at which work is done.

Question 48

What is the overcoming of resistance?

Answer 48

Work

Question 49

What is the rate at which velocity in a mass increases with time?

Answer 49

Acceleration

Question 50

What is flow rate?

Answer 50

The quantity of a substance that moves past a point in a given time.