Rigid Body Kinematics
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What are the characteristics of a particle?
Negligible dimensions, negligible rotation, assumed to be a point
What is particle kinematics?
Discipline of mechanics that deals with motion of a particle over time WITHOUT ref. to the forces that cause displacement, v, and a
What is a scalar quantity?
Defined only by magnitude.
What is a vector quantity?
Has magnitude and direction.
What are the vector quantities for distance, mass and speed?
Displacement, weight and velocity
What is particle plane motion?
Moving in a plane/2D
What are the types of particle plane motion?
Rectilinear and curvilinear
Displacement is…
Amount of change in position
If displacement is not 0 the particle is…
Moving
Speed of the particle depends on…
The time it took to move
What is the rate of change of the position of the particle
V= delta x/ delta t ( change in position/change in time)
What do you call the magnitude of velocity?
Speed
If the velocity of an object is changing the object is …
Accelerating
Constant velocity means…
Speed and direction do not change
The rate of change of velocity is called…
Acceleration
Aristotle thought that…
All motion on Earth is linear. Diff. Masses fall at diff. Rates. Natural stat of massive objects is to seek the center of the Earth. All motion in the heavens is curved.
According to Aristotle what is natural motion? Violent?
Motion is at rest or constant speed. Violent is otherwise.
Galileo discovered that…
Diff. Masses fall at the same time. Friction prevents this from happening when not in a vacuum.
What are Newton’s laws of motion?
Inertia, Acceleration, Action-reaction
Projectile motion is…
Not purely curvilinear. Only force acting on the particle is gravity. Thrown things. Can be resolved into horizontal and vertical forces.
What angle is max range? Max elevation?
45, 90
What is uniform circular motion?
Constant speed along a circle
What is the formula?
Average speed = 2pi r/t
In circular motion velocity is…
Always changing.