Physics Test 2 Review Flashcards
What is the proof for vf = vi + at?
Acceleration = (final velocity - initial velocity) / change in time
Proofs of Equation d = vit + 1/2at^2
Let b = base and h = height. B = time and H = vi or (vf - vi)
Area Proof: displacement = A1 + A2 = bh + 1/2bh = vit + 1/2(vf - vi)(t) = vit + 1/2at^2
Algebra proof: displacement = ((vi + vf)/2) (t) = ((vi + (vi + at)) / 2)(t) = ((2vi + at) / 2)(t) = vit + 1/2at^2
What is the proof for vf^2 = vi^2 + 2ad?
V = d/t, d = ((Vi + Vf) /2)(t) = ((Vi + Vf) /2)((Vf - Vi) / a) = ((ViVf) - (Vi^2) + (Vf^2) - (VfVi)) / 2a = ((-Vi^2) + (Vf^2)) / (2a)
2ad = -Vi^2 + Vf^2
Vf^2 = Vi^2 + 2ad
What is the equation without Vf?
D = vit + 1/2at^2
What is the equation without t?
Vf^2 = Vi^2 + 2ad
What is the equation without d?
Vf = vi + at
What is the equation without a?
Vi = 2(d / t) - vf
What is the equation gives you velocity when acceleration is 0?
V = d / t
What is the formula for average acceleration?
A = (Vf - Vi) / change in time
What is the formula for acceleration due to gravity?
A = -9.81 m / s ^2
What is the unit of measurement for acceleration?
M / S ^2
What is the unit of measurement for velocity?
M / S
What is the conversation for km / h to m / s?
Divide by 3.6
What is the proof for the conversion from km / h to m / s?
(1000 m / 1 km)(1 h / 3600 s) = (1000)(1 / 3600) = (1/3.6)
What is acceleration?
The rate of change of velocity with time
What are the four types of acceleration?
Slowing down West / Down, Speeding up West / Down, Slowing down East / Up, Speeding Up East / Up
What are the negative types of acceleration? What are the positive types?
Negative: Slowing down East / Up, Speeding up West / Down
Positive: Speeding up East / Up, Slowing down West / Down
Describe the motion of a bouncy ball dropped from a tall building, hits the ground, rebounds, bounces, then comes to a stop
Rest, speeding up down, slowing down up, rest
An object pushed from rest accelerates 5 m/s^s for 0.8 m, then continues at that constant speed for 4s, then slows to rest in 2.5 s. What is the total distance it travelled?
15.5 meters
Initial velocity of 8.2 m/s, slides for 3s, final velocity is 3.1 m/s. If the object continues sliding at that constant acceleration, how long until it stops?
4.8 s
