PRELIMS

Question 1

An action: push or a pull

Answer 1

Force

Question 2

A force ____/____ on an object

Answer 2

acts/exerts

Question 3

A force requires a cause: an _____.

Answer 3

agent

Question 4

A force can be either a contact or a long-range force. True or False?

Answer 4

True

Question 5

When you are pulling a rope attached to a box, what is the agent? The rope or the box?

Answer 5

The rope

Question 6

When forced are exerted on an object,they combine to form a _______.

Answer 6

Net Force

Question 7

What does the triple parallel horizontal lines mean?

Answer 7

“is defined as”

Question 8

What do you call the summation of forces?

Answer 8

Superposition of forces

Question 9

The pull of a planet on an object or near the surface is called what?

Answer 9

Gravitational Force

Question 10

What is the agent for the gravitational force?

Answer 10

The entire planet

Question 11

Gravity acts on an object, whether moving or at rest. True or False?

Answer 11

True

Question 12

What is the symbol for gravitational force?

Answer 12

F with an arrow above it the sub big G. (F_G)

Question 13

The gravitational force always points vertically or horizontally downward?

Answer 13

Vertically

Question 14

A force with a symbol F sub Sp.

Answer 14

Spring Force

Question 15

A spring can push when?

Answer 15

compressed

Question 16

A spring can pull when compressed. True or False?

Answer 16

False. A spring can pull when it is stretched.

Question 17

A contact force that is exerted when a spring or wire pulls an object. Represented by a captial T with arrow above it.

Answer 17

Tension Force

Question 18

What is the direction of the tension force?

Answer 18

Always along the direction of the rope or spring.

Question 19

In Ball-and-Spring model of solids, solids are represented by what array and connected by springs?

Answer 19

Array of Balls.

Question 20

What force does the stretched or compressed bonds exert?

Answer 20

Spring Forces

Question 21

The force exerted perpendicular to a surface (the agent) against an object that is pressing against the surface.

Answer 21

Normal Force (n)

Question 22

Like the Normal Force, it is the force exerted by the surface.

Answer 22

Friction.

Question 23

If the normal force is always perpendicular to the surface, the friction force is always _____ to the surface.

Answer 23

Parallel

Question 24

What are the two kinds of friction?

Answer 24

Kinetic and Static Friction

Question 25

denoted by f sub k.

Answer 25

Kinetic Friction

Question 26

A type of friction that appears as an object slides across a surface.

Answer 26

Kinetic Friction

Question 27

Kinetic Force opposes the motion. True or False?

Answer 27

True

Question 28

The friction force vector points in a direction _____ the velocity vector.

Answer 28

opposite

Question 29

Denoted as f sub s.

Answer 29

Static Friction

Question 30

It points to the direction necessary to prevent motion.

Answer 30

Static Friction

Question 31

One example of a resistive force.

Answer 31

friction at a surface

Question 32

The resistive force of fluid is called ____.

Answer 32

Drag

Question 33

F sub drag is the symbol of what?

Answer 33

A resistive force called drag.

Question 34

Like kinetic friction, it points to the opposite direction of motion.

Answer 34

Drag

Question 35

Neglect air resistance unless asked.

Answer 35

Okay.

Question 36

The force that occurs when a jet or rocket engine expels gas molecules at high speed.

Answer 36

Thrust

Question 37

No special symbol for thrust so we call it ____.

Answer 37

F sub thrust with arrow on the top.

Question 38

Electricity and magnetism, like gravity, exert contact forces or long-range forces?

Answer 38

Long-rage forces.

Question 39

The acceleration is _______ proportional to the object's mass.

Answer 39

Inversely

Question 40

The amount of matter an object contains.

Answer 40

Mass

Question 41

The more matter an object has, the more it resists accelerating in response to a force. True or False.

Answer 41

True

Question 42

The tendency of an object to resist a change in its velocity is called ____.

Answer 42

Inertia

Question 43

A measure of an object's resistance to changing its motion is called inertial mass. True or False?

Answer 43

True.

Question 44

What is Newton's Second Law of Motion?

Answer 44

An object accelerates in the direction of the net force vector.

Question 45

formula of acceleration (a)

Answer 45

Fnet over m

Question 46

A ____ is an interaction between 2 objects.

Answer 46

force

Question 47

"For every action there is an equal but opposite reaction."

Answer 47

Newton's Third Law

Question 48

An object at rest is in a _____ state.

Answer 48

Natural

Question 49

Define mechanical equilibrium

Answer 49

An object at rest or at motion at constant velocity with zero net force is called Mechanic Equilibrium.

Question 50

There is a object/cause needed for an object to move. True or False?

Answer 50

False. Force is what causes an object to change its velocity.

Question 51

Formula for net force.

Answer 51

Mass times acceleration

Question 52

The natural state of an object is not rest but is uniform motion with constant velocity.

Answer 52

Rest is v = 0

Question 53

A reference frame in which Newton's first law is valid.

Answer 53

Inertial Reference Frame

Question 54

True or False. Accelerating reference frames are not inertial references frame.

Answer 54

True

Question 55

Forces exist the point of contact above the agent and the object experiencing the force. True or False.

Answer 55

False. *Between the agent and the object. (except for the few special cases of long-range forces)

Question 56

A quantity that is fully described by a single number (with units)

Answer 56

Scalar Quantity

Question 57

Mass(m) and Volume (V) are examples of what quantity?

Answer 57

Scalar Quantity

Question 58

A quantity having both a size and a direction is called a vector. True or False.

Answer 58

True.

Question 59

What is the mathematical term for the length, or size, of a vector?

Answer 59

Magnitude

Question 60

A quantity having a magnitude and a direction.

Answer 60

Vector Quantity

Question 61

What is the geometric representation of a vector?

Answer 61

An arrow.

Question 62

The magnitude of a vector is a?

Answer 62

Scalar

Question 63

The straight-line connection from the initial to the final position.

Answer 63

Displacement

Question 64

The sum of two vectors.

Answer 64

Resultant Vector

Question 65

The tip-to-tail method for adding vectors.

Answer 65

Graphical Addition

Question 66

Formula to find the angle.

Answer 66

arccos (A²+C²-B²/2AC)

Question 67

An artificially imposed grid that you place on a problem to make quantitative measures.

Answer 67

Coordinate System

Question 68

Velocity, Acceleration, and Forces.

Answer 68

Examples of Vector Quantity