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Chapter 2
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Chapter 2
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Intermittent Motion
Motion that is interrupted by periods of rest.
Elements of Motion
displacement, velocity, acceleration
Velocity
Includes direction and sense as well as speed
Direction and Sense
If a point is moving along a straight path the direction of its motion is along the line which constitutes its path
Cycle of Motions
A series of movements in a mechanism that are repeated over and over again.
Uniform Speed
Speed in which equal spaces are passed over in equal times, with no variation.
Variable Acceleration
The acceleration of a moving particle may vary as some function of distance moved, velocity, or time.
Translation
When all the component particles of a body have the same velocity as regards both speed and direction
Variable Speed
Speed that changes over time, with unequal spaces being passed over in equal times.
Turning Bodies
All motion consists of translation, turning about an axis, or a combination of the two.
Direction of Rotation or Revolution
Giving the direction of the axis, and the sense is given by stating whether the turning is right handed (clockwise) or left handed (counterclockwise)
Linear Acceleration
The time rate of change of linear velocity
Axis of Rotation or Revolution
A line that remains unchanged by the rotation or revolution of a body.
Motion
The change in position of an object over time.
Normal Acceleration
A change in direction normal to the path of the point
Path
The line described by a point moving in space.
Uniform Motion
When the acceleration is zero, the velocity is constant, and the moving particle continues to move in a straight line over equal distances in equal intervals of time.
Reciprocating Motion
Motion that traverses the same path and reverses its motion at the ends of the path.
Oscillation
A term applied to reciprocating circular motion, as that of a pendulum.
Coplanar Motion
Motion in which all component particles of a body are moving in the same plane or in parallel planes.
Angular Acceleration
The time rate of change of angular velocity
Uniformly Varying Motion
In this case, the acceleration is constant; that is, the speed changes by equal amounts in equal intervals of time, like that of a body falling under the action of gravity.
Angular Speed
The speed at which the wheel turns is the rate at which any line on it (radial or otherwise) changes direction.
Period of Motion
The time taken to complete one cycle of motion.
Plane of Rotation or Revolution
A plane that is perpendicular to the axis of rotation or revolution.
Harmonic Motion
A type of motion in which the acceleration varies directly as the displacement.
Revolution and Rotation
A point is said to revolve about anaxis when it describes a circle of which the center is in the axis and ofwhich the plane is perpendicular to that axis.
Classification of Motion
a) A is zero, b) A is constant, c) A is a variable
Continuous Motion
Motion that continues indefinitely in a given path in the same sense.
Linear Speed
The time rate of motion of a point along its path, or the rate at which a point is approaching or receding from another point in its path.
Semi-Graphical Methods
Often no direct relation exists between acceleration, velocity, distance moved, and time that can conveniently be expressed in the form of equations.
Tangential Acceleration
A change in speed or direction tangent to the path of the point
Scholarly Assistant's Insights
Summary of different types of motion including intermittent, uniform, reciprocating, and harmonic motion.
Motion
Physics
Mechanics
Velocity
Acceleration
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