Day Topic: Acceleration Formula

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Presentation transcript:

Day 14 11-9-10 Topic: Acceleration Formula Objective: I will solve problems with proper formula and template. Science Starter: What would the X-t graph of this A-t graph look like? This graph shows CONSTANT ACCELERATION. The object must be speeding up or slowing down A t x t

Acceleration Formula used to calculate acceleration Delta means “change in” Units are length/time squared m s m s2 km hr mi hr s EX:

Explaining the f and the i The f stands for “final” or the ending velocity f = final velocity The i stands for the “initial” or starting velocity i= initial velocity

Acceleration Triangle (reference section) ΔV Change in Velocity A T Acceleration Time COVER what You are looking for

1. A parachute on a racing dragster opens and changes the speed of the car from 65 m/sec to 35 m/sec in a period of 2.5 seconds. What is the acceleration of the dragster? Looking for: Given: Formula: Solution:

2. The cheetah, which is the fastest land mammal, can accelerate from 0.0 mi/hr to 50.0 mi/hr in 2.5 seconds. What is the acceleration of the cheetah? Give your answer in units of mph/sec. Looking for: Given: Formula: Solution:

3. The Ford Edge sports car can accelerate from 0. 0 km/hr to 75 3. The Ford Edge sports car can accelerate from 0.0 km/hr to 75.6 km/hr in 3.0 seconds. What is the acceleration of this car? Give your answer in units of kilometers per hour/sec. Looking for: Given: Formula: Solution:

4. Which has greater acceleration, the cheetah or the Ford Edge 4. Which has greater acceleration, the cheetah or the Ford Edge? (To figure this out, you must remember that there are 1.6 kilometers in 1 mile.) Be sure to show your calculations. Looking for: Given: Formula: Solution: 4. Which has greater acceleration, the cheetah or the Lamborghini Diablo? (To figure this out, you must remember that there are 1.6 kilometers in 1 mile.) Be sure to show your calculations.

Challenge (multi step) 1.If a car can go from 0.0 to 60.0 mi/hr in 8.0 seconds, what would be its final speed after 5.0 seconds if its starting speed were 50.0 mi/hr? Looking for: Given: Formula: Solution:

2. A cart rolling down an incline for 5 2. A cart rolling down an incline for 5.0 seconds has an acceleration of 4.0 m/sec2. If the cart has a beginning speed of 2.0 m/sec, what is its final speed? Looking for: Given: Formula: Solution:

PUT IN REFERENCE SECTION #1 A C E L R T I O N a = Vf – Vi t #2 t = Vf-Vi a Vf = Vi + at Vi = Vf - at PUT IN REFERENCE SECTION #3 #4