Kinematic Equations

Notice that he uses v and v_o in his equations. How does his notation of the final and initial velocity relate to our notations of the final and initial velocity? (Hint: Look at the equations you already recorded in your notes)

• v means final velocity (v_f) and v_o means initial velocity (v_i)

• v means average velocity and v_o means initial velocity (v_i​)

• v means initial velocity (v_i) and v_o means final velocity (v_f​)

The question says "how long does it take to reach its top speed...". Which variable are you being asked to solve for? (What is your unknown?)

• distance

• displacement

• time 

• final velocity

Tags

CCSS.7.EE.B.4A

Starting from rest means that the initial velocity was

• 0 km/hr

• 5 km/hr

• 80 km/hr

• cannot be determined

Tags

CCSS.HSF.LE.B.5

Which equation would you chose to solve this problem? 

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Tags

CCSS.8.EE.C.7B

I know he says we're not solving the problems. But where's the fun in that! Go ahead and solve the problem. How much time does it take? 

Hint: 80.0km/h=22.2m/s

Also, the a=1.35m/s² (he did not write the decimal well)

• 16.5 s

• 59.3 s

• 108 s

What are your known variables from the first sentence alone? (select all that apply)

• Time (t)

• Initial Velocity (V_i)

• Final Velocity (V_f)

• Acceleration (a)

• Change in Displacement (X)

Tags

CCSS.8.EE.C.7B

What's the initial velocity given in the first sentence?

• 0 m/s

• +2.4 m/s

• -2.5 m/s

• 12 m/s

Tags

CCSS.HSF-IF.C.7C

What's the acceleration provided in the first sentence?

• -12 m/s/s

• +2.4 m/s/s

• 0 m/s/s

Using ONLY the information in the first sentence, which kinematic equation(s) allows you to directly solve for something? (Select all that apply.)

 

 

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Tags

CCSS.8.EE.C.7B

What would have to be true for the acceleration to be negative in this situation? Assume that forward is the positive direction and backward is the negative direction

(Select all that apply.)

• The car speeds up while moving backward

• The car slows down while moving backwards

• The car speeds up while moving forward

• The car slows down while moving forward