Physics Test 2 Review

Question 1

What is the proof for vf = vi + at?

Answer 1

Acceleration = (final velocity - initial velocity) / change in time

Question 2

Proofs of Equation d = vit + 1/2at^2

Answer 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

Question 3

What is the proof for vf^2 = vi^2 + 2ad?

Answer 3

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

Question 4

What is the equation without Vf?

Answer 4

D = vit + 1/2at^2

Question 5

What is the equation without t?

Answer 5

Vf^2 = Vi^2 + 2ad

Question 6

What is the equation without d?

Answer 6

Vf = vi + at

Question 7

What is the equation without a?

Answer 7

Vi = 2(d / t) - vf

Question 8

What is the equation gives you velocity when acceleration is 0?

Answer 8

V = d / t

Question 9

What is the formula for average acceleration?

Answer 9

A = (Vf - Vi) / change in time

Question 10

What is the formula for acceleration due to gravity?

Answer 10

A = -9.81 m / s ^2

Question 11

What is the unit of measurement for acceleration?

Answer 11

M / S ^2

Question 12

What is the unit of measurement for velocity?

Answer 12

M / S

Question 13

What is the conversation for km / h to m / s?

Answer 13

Divide by 3.6

Question 14

What is the proof for the conversion from km / h to m / s?

Answer 14

(1000 m / 1 km)(1 h / 3600 s) = (1000)(1 / 3600) = (1/3.6)

Question 15

What is acceleration?

Answer 15

The rate of change of velocity with time

Question 16

What are the four types of acceleration?

Answer 16

Slowing down West / Down, Speeding up West / Down, Slowing down East / Up, Speeding Up East / Up

Question 17

What are the negative types of acceleration? What are the positive types?

Answer 17

Negative: Slowing down East / Up, Speeding up West / Down

Positive: Speeding up East / Up, Slowing down West / Down

Question 18

Describe the motion of a bouncy ball dropped from a tall building, hits the ground, rebounds, bounces, then comes to a stop

Answer 18

Rest, speeding up down, slowing down up, rest

Question 19

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?

Answer 19

15.5 meters

Question 20

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?

Answer 20

4.8 s