Dynamics Chapter 1

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29 Terms

1

Dynamics

Branch of mechanics which deals with the study of bodies in motion

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2

Galileo Galilei

Who derived the Laws of motion and served as the Foundation of Dynamics

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3

Newton’s Second Law of Motion

This law states that the force acting on a body is equal to the rate of change of the body’s momentum.

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4

Galileo Galilei

who made careful observations concerning bodies in free fall, motion on an inclined plane, and motion of pendulum

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5

True

heavy bodies fall more rapidly than light bodies. True or False

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6

Huygens 1657

Who invented the pendulum clock and in what year?

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7

Principia

Newton’s famous work was published in the first edition of _____.

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8

Kinematics

motion of a particle or body without consideration of the forces causing the motion.

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9

Kinetics

branch of mechanics that relates the force acting on a body to its mass and acceleration.

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10

Particle

usually denotes an object of point size

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11

Rigid Body

is a body whose changes in shape are negligible

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12

Rigid Body

a body for which the deformations can be neglected with no loss of accuracy in the analysis of motion

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13

Rectilinear Motion

the motion of a particle along a staright line

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14

displacement

defined as the change in the position of a particle

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15

Speed

Magnitude of velocity

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16

Resultant Force

What is the effective force on a particle?

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17

Newton’s Third Law of Motion

for every force there is an equal and opposite reaction

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18

Inertia Force

If a particle is accelerated by a resultant force, this reaction is called?

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19

False

Inertia Force is equal and directed reaction to the resultant force acting on a particle. True or False

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20

Static equilibrium

If the inertia force is condidered to act on a particle together with the resultant force, the particle will be in ____

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21

Static Equilibrium

the particle is at rest or is moving with constant velocity

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22

D’Alembert’s Principle

Alternative form of Newton’s second law of motion.

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23

Jean le Rond D’Alembert 18th Century

Who and when was D’Alembert’s Principle formulated?

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24

D’Alembert’s Principle

F-ma=0

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25

D’Alembert’s Principle

expresses the relation between the external forces applied to a system of particles and the effective force on each particle of the system

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26

Centroidal Rotation

all particles will describe horizontal circular arcs about the vertical centroidal axis

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27

Plane Motion

since resultant can be transformed into a force acting through the gravity center plus a couple it can be seen that the motion in this case will be a combination of translation and centroidal rotation

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28

Curvilinear Translation

if the direction of R varies, although continuing to pass through the gravity center, so will the motion of the body, resulting in a curved path motion known as

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29

Rectilinear Translation

if the direction of R is constant, the motion of the body follows a straight-line path and is called

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