Physics Kinematic A Flashcards
What is a scalar?
No direction.
What is a vector?
Have direction (position, displacement, velocity, acceleration).
Define uniform motion.
Constant speed, constant direction.
Define non-uniform motion.
Changing speed, changing direction.
What is the acceleration due to gravity when a ball is dropping?
9.8 m/s².
If an object starts from rest, what is its initial velocity (Vi)?
0 m/s.
What is the method to calculate maximum height?
ADD ALL X COMPONENTS, ADD ALL Y COMPONENTS, THEN FIND D r.
How do you add vectors?
Tail to tip.
How do you subtract vectors?
Tail to tail.
What is free fall?
Motion of an object when it is moving only under the influence of gravity.
How do you calculate average velocity in two dimensions?
Total displacement in two dimensions divided by time interval (v av=d/t).
How do you find change in velocity in 2D?
Separate velocity vectors into components and subtract using vector property vf-vi=vf+(-vi).
What is uniform circular motion?
Occurs when an object moves in a circular path at constant speed.
What is instantaneous velocity in circular motion?
Tangent to the circular path and has constant magnitude.
What is the direction of acceleration in uniform circular motion?
Directed radially inward.
What is centripetal acceleration?
Center seeking acceleration.
What is the formula for centripetal acceleration?
ac = v²/r.
What does ‘f’ represent in centripetal acceleration?
Frequency in Hz.
How do you convert revolutions to frequency?
rev/60 = Hz.
What is the centripetal acceleration of a child on a merry-go-round 3.0 m from the center with a speed of 2.0 m/s?
1.3 m/s² inwards.
What is the centripetal acceleration formula involving frequency?
ac = 4π²rf².
What is the centripetal acceleration of an ant sitting at the edge of a vinyl record rotating at 33.3 rpm?
185.45 cm/s² inwards.
What is the path of a projectile when dropped from a vertical height?
Parabolic path.
What motion components must always be split when dealing with projectile motion?
VX and VY.
In projectile motion, which component is used for time?
Y components.
What remains constant during horizontal motion of a projectile?
Velocity (Vx).
What is the acceleration in the vertical direction of projectile motion?
a due to gravity.
What is the value of g?
9.8 m/s².
What is the relationship between horizontal and vertical motion in a projectile?
Independent.
What is the total time of motion in projectile motion determined by?
Y components.
What does ‘dy’ represent in the equations of projectile motion?
Vertical displacement.
What does ‘dx’ represent in the equations of projectile motion?
Horizontal displacement.
All motion is ______.
Relative.
What does the point of view of motion describe from?
Frame of reference.
What is the most common frame of reference assumed to be?
Earth, which is assumed to be stationary.
