Chapter 10 - Motion and Forces

Question 1

A vector representing the object’s change in position

Answer 1

Displacement

Question 2

The study of motion and forces

Answer 2

Dynamics

Question 3

Branch of physics the address the effects of forces on matter

Answer 3

Mechanics

Question 4

Any change in velocity

Answer 4

Acceleration

Question 5

A) States that any two objects attract each other through gravitational force
B) gravitational force exerted on an object near the surface of the earth or any celestial body

Answer 5

A) universal law of gravitation

B) gravity

Question 6

Velocity at which the force of drag stops an object from speeding up

Answer 6

Terminal velocity

Question 7

Center seeking force that causes objects to travel in a curved path rather than a street line

Answer 7

Centripetal force

Question 8

Center fleeing force results from an object’s weight attempting to move in a straight line

Answer 8

Centrifugal force

Question 9

A) friction on a moving object
B) friction that keeps an object from moving
C) Unitless values in express effect of serf aces on friction

Answer 9

A) Kinetic friction
B) static friction
C) coefficient of friction

Question 10

Rate of doing work

Answer 10

Power

Question 11

The product of an objects mass and velocity

Answer 11

Momentum

Question 12

Early force-multiplier machines

Answer 12

Simple machine

Question 13

The ratio of work output to work input

Answer 13

Efficiency

Question 14

Pivot point upon which the beam of a lever rests

Answer 14

Fulcrum

Question 15

Beam of the lever from the fulcrum to the input

Answer 15

Input arm

Question 16

Beam of a lever from the fulcrum to the output force

Answer 16

Output arm

Question 17

Simple machine consisting of a sloping surface that allows an objects to be raised without lifting it straight up

Answer 17

Inclined plane

Question 18

Special form of inclined plane that modifies the applied force and directs it to the side

Answer 18

Wedge

Question 19

Simple machine resembling and an inclined plane wrapped around a rod

Answer 19

Screw

Question 20

Distance from one of the ridges or threads on the screws shaft to the next

Answer 20

Pitch

Question 21

Two types of mathematical quantities used in physics

Answer 21

Scalar, Vector

Question 22

Equation for average speed

Answer 22

S equals D over T

Question 23

Scalar representing the total length of the object’s path

Answer 23

Distance

Question 24

The author of Principia

Answer 24

Sir Isaac Newton

Question 25

The law of motion that is also called the law of inertia

Answer 25

First of law of motion

Question 26

The equation for free fall distance

Answer 26

D equals one half G times T squared d=1/2gtsuperscript2

Question 27

The resistance arising to an objects motion doing fluid or across the surface

Answer 27

Friction

Question 28

The SI unit for power

Answer 28

Watt

Question 29

Principal stating the total momentum of the system is constant unless an outside force acts on the system

Answer 29

Law of conservation of momentum

Question 30

Two types of mechanical advantage

Answer 30

Ideal mechanical advantage or actual mechanical advantage

Question 31

Machine that is like a circular lever

Answer 31

Wheel and axel

Question 32

Three main arrangements of pulleys

Answer 32

Fixed,movable, and block and tackle

Question 33

What is the difference between classical physics and modern physics?

Answer 33

Classical physics – branches of physics developed before 1900 Modern physics – branches of physics developed since 1900

Question 34

How do you speed and velocity differ?

Answer 34

Speed – scaler quantity measuring distance traveled per unit time Velocity– vector quantity measuring change in position per unit time

Question 35

What law says that forces always occur in pairs

Answer 35

Third law of motion

Question 36

Explain the two things on which friction depends

Answer 36

Weight of the object nature of the surfaces

Question 37

What is the relationship between work and energy?

Answer 37

The amount of work done = the amount of energy transferred.

Question 38

Under ideal conditions what is the relationship between a machines input work and output work

Answer 38

They are equal

Question 39

List and describe the three classes of levers

Answer 39

Class 1 - input and output forces on opposite sides of fulcrum Class 2 – Output between input and fulcrum Class 3 – input between output and fulcrum

Question 40

If the force is constant how is an objects acceleration related to its mass

Answer 40

Directly proportional