Motion and Speed inertia Acceleration 2 1 Describing

Motion and Speed inertia Acceleration

2. 1 Describing Motion 1. Motion 2. Speed a. distance b. displacement v = d/t 1. Most common unit is meters/second (m/s) 2. Other units - km/h 3. 4. 5. 6. 7. Constant Speed – does not change Average Speed – total distance/total time Instantaneous Speed – any given moment Graphing Motion – p. 43 Velocity – speed in a given direction 1. How is velocity different from speed? 2. Ways we can show direction -

2. 1 Speed Problems 1. A Student practicing for a track meet ran 200 meters in 25 seconds. What was her average speed? 2. A car traveled 875 km from Louisville to Philadelphia in 11. 5 hr. What was the average velocity? 3. If the average speed of a car is 60 km/hr, how far can it travel in 45 minutes?

2. 1 Review 1. Is motion relative? Yes or No 2. Distance and displacement are the same. Yes or No 3. Most of the time speed is constant. Y/N 4. What is the speed of a runner who runs 400 m in 43 seconds? 5. Velocity and speed are identical. Y/N 6. Bonus – Name the fastest land animal.

2. 2 Acceleration 1. Acceleration – rate of change of velocity. 2. 3 ways you accelerate - speed up, slow down/stop, and change direction. 3. Acceleration = Vfinal – Vinitial / time 1. m/s/s or m/s² 4. Positive acceleration = speeding up 5. Negative acceleration = slowing down Explain the changes in acceleration in a tennis ball as it is dropped and bounces.

Types of Acceleration

Comparison of Speed & Acceleration Graphs

2. 2 Quiz 1. 2. 3. 4. 5. List 3 ways you can accelerate Positive acceleration is… Negative acceleration is… Is circular motion a form of acceleration? If your speed stays the same, can you be accelerating?

2. 3 Motion and Forces 1. What is force? Exerted by another obj. 2. Two types of force – 1. Balanced forces 2. Unbalanced forces – cause change in motion 3. Inertia and Mass 1. > Mass = > Inertia 4. Newton’s First Law – The Law of Inertia Object at rest, stays at rest, and an object in motion, stays in motion, unless an unbalanced force acts on the object