Happy Monday! Turn-in homework. Today: We will practice more acceleration problems HW: pg : 20, 21, 25, 28, 29, 33, 39, 40

Sample An Indy-500 race car's velocity increases from 4.00 m/sec to 36.0 m/sec over an interval lasting 4.00 seconds. What is the car’s average acceleration? How far does the car travel?

Sample A golf ball rolls up a hill towards a putt- putt hole. It leaves the club traveling +2.0 m/sec and experiences an acceleration of m/sec 2. What will be its velocity after 3 seconds? 5 seconds? What happens between 3 and 5 seconds?

Sample An airplane while in flight, accelerates from a velocity of 21.0 m/sec at a constant rate of 3.00 m/sec 2 over a total of 535 meters. Determine the final cruising velocity of the plane.

Sample Statistically, a person wearing a shoulder harness can survive a car crash if the acceleration is smaller than m/sec 2. Assuming a constant acceleration, how far could the front end of a car collapse if the car impacts while going 28.0 m/sec and comes to a complete stop?

It’s Tuesday! Turn in yesterday’s worksheet and HW Today: Acceleration and Motion Graphs HW: Graphs WS STEM Club Meeting is on THURSDAY after school in room 117 I’ll be in room 117 office at lunch today.

Warm-Up If a bullet leaves the muzzle of a rifle with a speed of 600. m/sec, and the barrel of the rifle is meters long, what is the acceleration of the bullet while in the barrel?

Acceleration Time Graphs

Sample What is the cart’s initial velocity? What is the cart’s initial position? How much did the cart’s velocity change from 2 to 14 seconds? What is the cart’s velocity at 14 seconds? How fast was the cart traveling at 8 seconds? How far did the cart travel between 2 and 14 seconds? What is the cart’s final position at 14 seconds?

Sample What was the average acceleration of the car between 0 and 10 seconds? What was the average acceleration of the car between 10 and 15 seconds? What was the average acceleration of the car between 15 and 40 seconds? What was the average acceleration of the can between 40 and 55 seconds? Sketch an acceleration vs. time graph for the car.

One Day Until Friday! Agenda: –Book Notes –Annotate Class Notes –Go over homework together… you have to get this! I will collect this tomorrow. Tomorrow: –Quiz –POTW is Due –Bowling Ball Lab on Monday Note: Stem Club Meeting today after school in room 117. WebAssign HW will not show up until Friday… so it’s due Monday at 11:59 pm

Book Notes and Annotation You need to review: 1.Get a yellow Physics Book 2.Starting on pg. 10, read the following section and take notes: a)Speed (2.2) b)Velocity (2.3) c)Acceleration (2.4) 3.Get your class notes out and with your shoulder partner: a)Review each section b)Annotate and write a summary for each topic

SAMPLE PROBLEMS

Sample An airplane travels 280 m down the runway before taking off. If it starts from rest and becomes airborne in 8.0 sec, how fast is it moving at takeoff assuming a constant acceleration?

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Starting from rest, a boulder rolls down a hill with constant acceleration and travels 2 m during the first second. How far does it travel during the 2 nd second?

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A fugitive tries to hop on a freight train traveling at a constant speed of 6 m/sec. Just as an empty box car passes him, the fugitive starts from rest and accelerates at 4 m/sec 2 to his maximum speed of 8 m/sec. How long does it take him to catch up to the empty box car?

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