Quiz #1

Question 1

Newton’s 1st Law

Answer 1

If an object is in motion, it will remain in motion. If an object is at rest, it will remain at rest, unless a force acts on it

Question 2

Newton’s 2nd Law

Answer 2

When the sum of forces acting on an object is nonzero, the sum of the forces equals the product of the mass and its acceleration. F=ma

Question 3

Newton’s 3rd Law

Answer 3

For every reaction, there is an equal and opposite reaction.

Question 4

Particle

Answer 4

Is a mathematical model of an object as a mass point. i.e. A particle has mass but no size (dimensions) or shape

Object as a mass point.

Question 5

Gravity (g)

Answer 5

9.81 m/s^2 OR 32.2 ft/s^2

Question 6

Mass

Answer 6

Scalar Quantity

Question 7

Mass

Answer 7

Amount of material in body

Question 8

Mass

Answer 8

Measure of Inertia
a.) Inertia is the measure of the resistance to a change in motion.

Question 9

Mass

Answer 9

Same in any gravitational field
a.) independent of location

Question 10

Mass

Answer 10

Units: a) Slugs b) Kilograms
1 Slug = 14.59 kg

Question 11

Weight

Answer 11

Vector quantity

Question 12

Weight

Answer 12

Effect of gravity on a body

Question 13

Weight

Answer 13

Measure of the force exerted on a body by a gravitational field

Question 14

Weight

Answer 14

Varies with the strength of gravitational pull
a) dependent on location

Question 15

Weight

Answer 15

Units: a) Pounds b) Newtons
1lb = 4.448N

Question 16

Rigid Body

Answer 16

A mathematical model of a material body or a system of particles in which the distance between any two particles remains constant. i.e. NO DEFORMATION

“Material body or system of particles w/ NO DEFORMATION”

Question 17

Scalar

Answer 17

A quantity that can be completely specified without mentioning a direction.

Time, temperature, volume, mass, or energy speed, distance

Only magnitude

Question 18

Vector

Answer 18

A quantity (directed line segment) is completely specified by mentioning magnitude and direction, and it is added according to the parallelogram law.

Displacement, velocity, acceleration, momentum, or force

Includes magnitude and direction

Question 19

Magnitude

Answer 19

Length of a vector

Question 20

Free Vector

Answer 20

Has a definite magnitude and direction but no specific location in space

Question 21

Sliding Vector

Answer 21

one which can be moved along a given line collinear with the vector itself

Question 22

Bound Vector

Answer 22

One with a specified point of application

Question 23

Characteristics of Force

Answer 23

1) Point of application
2) its magnitude
3) its direction
a) Defined by the line of action and the sense of the force\
b) Line of Action is the infinite straight line along which
the force acts.

Question 24

Concentrated Force (Load)

Answer 24

represents the effect of loading which is assumed to act at a point on a body

Question 25

Distributed Load

Answer 25

is a force or force system spread over an area, either uniformly or non-uniformly

Question 26

External Forces

Answer 26

A force acting on the outside of a structure set in equilibrium

Question 27

Internal Forces

Answer 27

a force effect within the entity or any component part of a structure set in equilibrium

Question 28

Collinear Forces

Answer 28

force acting along the same line of action

Question 29

Coplanar Forces

Answer 29

forces that all lie in the same plane

Question 30

Concurrent Forces

Answer 30

forces that all intersect at a common point.

Question 31

General Space Force System

Answer 31

Non-coplanar, non-parallel, non-concurrent, con-collinear force system

Question 32

Moment

Answer 32

a moment of a force provides a measure of the tendency of a force to cause an object to rotate about a point or axis Think Torque? M = Fd (Scalar) M = r x F (Vector)

Question 33

Parallelogram Rule

Answer 33

Head-to-tail addition of vectors

Question 34

Moment

Answer 34

The tendency of a force to cause a rotation about a point or axis

Question 35

Varignon's Theorem

Answer 35

Can use the force or the component of a force to calculate the moment

Question 36

Equivalence

Answer 36

All systems can be reduced to a single force and moment and in special situations can reduce to a single force at a known location

Question 37

Transmissibility

Answer 37

Does not matter whether you push or pull as long as you maintain the same line of action. The result is the same

Question 38

Lateral Transfer Theorem

Answer 38

Allows the moment of a force laterally (Different from the line of action) As long a moment (couple) is added

Question 39

Superposition

Answer 39

As long as there is linearity, a complex problem can be broken down into simpler pieces and summed

Question 40

Friction

Answer 40

Columb's Law of dry friction which is empirical in nature not derived, but observed

Question 41

Area Moment of Inertia

Answer 41

Stiffness parameter based on shape