Introduction to Kinematics - (week 24) Flashcards
what are the two types of Linear movements ?
- translation
2. rotational
state what it is meant by the key term - translation movements
when all parts of the body are moving at the same speed, at the same time, in the same direction
state the names of the two types of translation movements
- rectilinear
2. curvilinear
state what it is meant by the key term - rectilinear
translation occurring along a straight line
state what it is meant by the key term - curvilinear
translation occurring along a curved line
state what it is meant by the key term - rotation
when parts of the body move though the same angle at the same time
what is general motion a combination of ?
general motion is a combination of rotation and translation movements
what is the difference between a scalar and a vector ?
- scalar - described only in terms of a magnitude
2. vector - described in terms of a magnitude, direction and a sense
a change in a vector quantity may result in what ?
a change in a vector quantity may result in a change in magnitude, sense, direction, or all three
what are the 4 things on a vector arrow you need to know about ?
- point of application
- (head) = sense
- dotted line = direction
- length of arrow = magnitude (or ‘norm’)
state what it is meant by the key term - position
a position refers to a location in space relative to a reference
state 3 additional facts about position
- described by a vector
- measured in metres (m)
- reference is always to the right horizontal
state what it is meant by the key term - trajectory
the trajectory is the path followed by the object in motion
state what it is meant by the key term - distance
the distance is the length of the trajectory path
state what it is meant by the key term - displacement
displacement is the change in position between two points in time
state 2 additional facts about displacement
- described by a vector (magnitude and direction)
2. measured in metres (m)
state what it is meant by the key term - velocity
velocity is the rate of change in displacement
state 2 additional facts about velocity
- measured in m/s or m.s-1
2. described by a vector (magnitude, direction, sense)
what is the formula for average velocity ?
change in displacement (m) / change in time (s)
what is the formula for average acceleration ?
change in velocity / change in time
state what it is meant by the key term - acceleration
the rate of change in velocity (m/s^2)
what does the gradient show on a displacement-time graph ?
gradient = velocity
what does the gradient show on a velocity-time graph ?
gradient = acceleration
state the formula for Vy
Vy = V x cos(θ)
state the formula for Vx
Vx = V x sin(θ)
