Midterm Prep Flashcards
(22 cards)
what is a scalar? give an example
a physical quantity that has a magnitude but no direction
example) height
what is a vector? give an example
a physical quantity that has magnitude and direction
example) displacement
what are 3 ways that a vector can be expressed?
- polar notation
- rectangular notation
- unit vector notation
what is a resultant?
the addition of two vectors form a resultant
what are 2 methods of adding vectors together?
- tip-to-tail method
2. vector resolution method
what is position?
the location of a point or an object
what is linear displacement?
the change in position
vector quantity (magnitude and direction)
what is linear distance?
change in position, measured along the path of motion
scalar quantity (magnitude, no direction)
what does it mean if dots are evenly/unevenly spaced on a dot-motion diagram?
evenly = equal time interval between dots
unevenly = unequal time interval
further apart = greater speed
the greater the slope the ___ the speed/velocity
the greater the speed/velocity
what is a projectile?
a body projected by an external force and continuing in motion by its own inertia
what is acceleration in the vertical and horizontal direction?
vertical = -9.81 m/s2
horizontal = 0 m/s2
what is range?
the horizontal displacement covered by a projectile
what is a radian?
the ratio of the length of an arc to the length of the radii that enclose the arc
what is a relative angle?
angle formed between 2 limb segments when flexed
what are absolute angles?
angle measure from an external frame of reference
measured from a positive horizontal axis
what is angular speed?
angular distance divided by time interval
scalar variable (magnitude only)
radians/second
what is angular velocity?
angular displacement divided by time interval
vector variable (magnitude and direction)
radians/second
what is angular acceleration?
change in angular velocity divided to time interval
vector variable (magnitude and direction)
radians per second squared
what is tangential velocity?
directed along a tangent to the path of angular motion
form of linear velocity
what is the dot product of perpendicular vectors?
0
how can you determine whether a perpendicular vector has a positive or negative sense?
right hand rule
