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# Motion etc

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### Motion etc

1. 1. PhysicsMotion, Speed, Velocity,acceleration, & energy
2. 2. Motion 1 What is motion? How do you know if something is “in motion?”
3. 3. Motion 2 Motion is the changing distance between two objects. You can tell if something is “in motion” based on a reference point.  Reference point: A place or object used for comparison to determine if something is in motion.
4. 4. Motion 3 Are we moving right now? Yes? No?  How do you know?  What is your reference point? **Technically, we are doing both moving AND not moving depending on your reference point!
5. 5. Speed 1 What is speed? How do you know what “speed” you are going? Is speed fast or slow? Or both?
6. 6. Speed 2 Speed is the amount of distance an object travels in any given amount of time.  We calculate speed like this: Speed = Distance / Time Average speed is just: total distance / total time
7. 7. Velocity 1 What is velocity? Is velocity the same thing as speed? How do I know what an objects velocity is?
8. 8. Velocity 2 Velocity is speed with direction. When dispatch contacts a police officer to let them know where a suspect is, they will give them a velocity: “the perpetrator is on walnut st. traveling at 40mph north.” What else do we use velocity to describe?
9. 9. Velocity 3 Change in velocity can be due to two things:  1. Change in speed  2. Change in direction  (it can be only one or both)
10. 10. Acceleration 1 What is acceleration? What does it mean to accelerate? What is the opposite of accelerate?
11. 11. Acceleration 2 Acceleration is the rate at which velocity changes with time. If velocity requires both speed and direction, then acceleration also requires both speed and direction. Therefore… acceleration refers to increasing speed, decreasing speed or changing direction!
12. 12. Acceleration 3 Increasing speed: When an objects speed increases, it is accelerating. Decreasing speed: When an objects speed decreases, it is deccelerating or has negative acceleration. Changing direction: If the direction changes so does the acceleration- even if the speed stays the same!!!
13. 13. Acceleration 4 Calculating acceleration: you must figure out the change in velocity per unit time.Acceleration= Final velocity - Initial Velocity timeThe units used for Acceleration are meters per second per second or m/s 2
14. 14. Energy Energy is the ability to do work or cause change. When a living thing does work on another object, some of that energy is transferred.  Examples?
15. 15. Kinetic Energy 1 Kinetic energy is the energy an object has due to its motion; this depends on both it’s mass and it’s speed.  More mass means more kinetic energy  More speed means more kinetic energy  Examples?
16. 16. Kinetic Energy 2 Calculating Kinetic Energy:Kinetic Energy = 1/2 x Mass x Speed 2Note- changing the speed has a greater impact on the object’s kinetic energy than changing the mass.
17. 17. Potential Energy 1 Potential Energy is stored energy that results from an objects position or shape.  This object has the potential to do work.  When the object was placed where it is or shaped a certain way, energy was transferred to it.  Examples?
18. 18. Potential Energy 2 Gravitational Potential Energy is an objects potential energy based on gravity. This is dependant on its height relative to a reference point and it’s weight. Elastic Potential energy is the potential energy of an object that can be stretched or compressed
19. 19. Law of Conservation of Energy According to the law of conservation of energy, energy cannot be created or destroyed.  (sound familiar? What is another law that is similar to this?)
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