Kinematics Day 3. Kinematic Equations Used in situations with uniform acceleration.

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Presentation transcript:

Kinematics Day 3

Kinematic Equations Used in situations with uniform acceleration

Kinematic Equations - Ex #1 A car traveling with an initial velocity of 6 m/s, accelerates at 2 m/s 2, for 6 seconds. What is the car’s final velocity?

Kinematic Equations - Ex #1 - Ans A car traveling with an initial velocity of 6 m/s, accelerates at 2 m/s 2, for 6 seconds. What is the car’s final velocity?

Sample Problems 2. You’re riding a unicorn at 25 m/s and come to a uniform stop at a red light 20 m away. What’s your acceleration? A: -15.6m/s 2

Practice Problems 3. With an average acceleration of -1.2 m/s 2, how long will it take a cyclist to bring a bicycle with an initial speed of 6.5 m/s to a complete stop? A: 5.4 s

Practice Problems 4. Suppose a treadmill has an average acceleration of 4.7 × 10 3 m/s 2. a. How much does its speed change after 5.0 min? b. If the treadmill’s initial speed is 1.7 m/s, what will its final speed be? 1.4 × 10 6 m/s and3.1 m/s

Practice Problems 4. A dune buggy accelerates uniformly at 1.5 m/s 2 from rest to 22 m/s. Then the brakes are applied and it stops 2.5 s later. Find the total distance traveled. A: 188.8m

If a baseball has zero velocity at some instant, is the acceleration of the baseball necessarily zero at that instant? If a passenger train is traveling on a straight track with a negative velocity and a positive acceleration, is it speeding up or slowing down? When you are out for a bike ride, you slow down on your bike as you approach a group of hikers on a trail. Explain how your acceleration can be positive even though your speed is decreasing. Small Group Questions