Not every object is going to travel at the same VELOCITY all the time.
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1 ACCELERATION
2 Not every object is going to travel at the same VELOCITY all the time.
3 ACCELERATION is the rate of change in velocity.
4 Mathematically A = velocity time Remember means change in
5 There are 3 ways to accelerate since there are 3 ways to change velocity 1. Increase velocity (speed up) 2. Decreaase velocity (slow down) 3. Change direction (turn)
6 PRACTICE For each of the following problems, 1- write what you know/want to know 2- write the formula 3- plug in numbers 4- circle answer with correct units
7 1- Which of the following experiences a greater acceleration A plane that goes from 1000 km/hr to 105 km/hr over 10 seconds A skateboard that goes from rest to 5 km/hr in 1 second
8 1- Which of the following experiences a greater acceleration? A plane that goes from 1000 km/hr to 105 km/hr over 10 seconds KNOW: V f V i Time FIND:
9 1- Which of the following experiences a greater acceleration? A skateboard that goes from rest to 5 km/hr in 1 second KNOW: V f V i Time FIND:
10 1- The skateboard is accelerating much faster! A plane that goes from 1000 km/hr to 105 km/hr over 10 seconds A skateboard that goes from rest to 5 km/hr in 1 second a= 0.5 km/hr/sec a= 5 km/hr/sec
11 2. If you know acceleration, can you calculate speed? A car initially traveling at 25 m/s undergoes a constant acceleration of 2.5 m/s 2 for 2 seconds. What is the car s final speed?
12 2. If you know acceleration, can you calculate speed? A car initially traveling 25 m/s undergoed a constant acceleration of 2.5 m/s 2. What is the car s final speed? KNOW: a V i Time FIND:
13 2. If you know acceleration, can you calculate speed? A car initially traveling at 25 m/s undergoes a constant acceleration of 2.5 m/s 2 for 2 seconds. The car s final speed is 30 m/s
14 3. If you know acceleration, can you calculate time? A cheetah can accelerate at a rate of 4.0 m/s 2. How long would it take the cheetah to reach its top speed of 32.0 m/s if it begins from rest?
15 3. If you know acceleration can you calculate time? A cheetah can accelerate at a rate of 4.0 m/s 2. How long would it take the cheetah to reach its top speed of 32.0 m/s if it begins from rest? KNOW: a V i V f FIND:
16 3. If you know acceleration, can you calculate time? A cheetah can accelerate at a rate of 4.0 m/s 2. It would take the cheetah 8 seconds to reach a speed of 32 m/s
17 4. Can you calculate negative acceleration? A golf ball rolls up a hill toward a miniature-golf hole. Assume that the direction toward the hold is positive. If the golf ball starts with a speed of 2.0 m/s and slows at a constant rate of 0.50 m/s 2, what is its velocity after 2 seconds?
18 4. Can you calculate negative acceleration? A golf ball rolls up a hill toward a miniature-golf hole. Assume that the direction toward the hold is positive. If the golf ball starts with a speed of 2.0 m/s and slows at a constant rate of 0.50 m/s 2, what is its velocity after 2.0 seconds? KNOW: a V i time FIND: V f
19 4. Can you calculate negative acceleration? A golf ball rolls up a hill toward a miniature-golf hole. Assume that the direction toward the hold is positive. If the golf ball starts with a speed of 2.0 m/s and slows at a constant rate of 0.50 m/s 2 its velocity after 2 seconds is 1.0 m/s
20 5- Can a car traveling north have an acceleration towards the south? Give an example.
21 5- Can a car traveling north have an acceleration towards the south? Give an example. A car slowing down to stop at a stop sign is actually accelerating because its velocity is changing. Sometimes we call this negative acceleration or deceleration. In our car example, if north is positive and south is negative, a car slowing down would still be going in the north direction but its vector would be pointing south, or negative acceleration.
22 6- Can an object move with a constant speed but a changing velocity? Explain
23 6- Can an object move with a constant speed but a changing velocity? Explain Since speed is a scalar quantity and velocity is a vector, something moving in a circle, like a Ferris Wheel, will travel at the same rate of speed, but its direction will be constantly changing. Thus its velocity vector would be constantly changing.
24 7- Give an example of an object undergoing acceleration, but maintaining a constant speed.
25 7- Give an example of an object undergoing acceleration, but maintaining a constant speed. If this car has its cruise control set, it will travel at a constant speed around this curve. However, its direction is constantly changing, thus it is accelerating.
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