Physics Kinematics Flashcards
Vector properties
Magnitude and direction
Scalar properties
Magnitude only
X-coordinate value of a vector
x = v (cos(theta))
Y-coordinate value of a vector
y = v (sin(theta))
How to add two vectors:
Place the tail of one at the head of the other and draw a new vector from the new head to new tail
Displacement
Vector quantity, x final - x initial
Velocity
Change in displacement over time
Acceleration
Change in velocity over time
Acceleration units
m/s^2
Velocity units
m/s
Deceleration
Acceleration in the opposite direction of velocity (does not necessarily mean slowing down)
What the slope of a displacement vs. time graph represents
Velocity
What does a horizontal line mean on a displacement vs. time graph
Not moving (V = 0)
What does a negative slope mean on a displacement vs. time graph
Moving backwards
What the slope of a velocity vs. time graph represents
Acceleration
Displacement equation (basic)
d = Vavg * t
Displacement equation (advanced)
d = ((Vi + Vf) / 2) * t
Acceleration equation (basic)
a = (Vf - Vi) / t
Equation for Vf
Vf = Vi + at
Kinematics Equation when missing Vf
d = Vi*t + 1/2at^2
Kinematics Equation when missing time
Vf^2 = Vi^2 + 2ad
Kinematics Equation for free fall
y = 1/2gt^2
Free fall equation for Vf
Vf^2 = 2gy
Steps for projectile motion questions
- Find Viy
- Use Viy to find time in the air
- Double answer from 2, since it only represents first half of arc (to peak when Vy = 0)
- Calculate Vix
- Use d = vt to calculate distance in horizontal direction
Kinematics Equation when missing displacement
Vf = Vi + at
Kinematics Equation when missing acceleration
d = Vavg * t
