STATE EXPECTATION: P2.1 AN OBJECT’S POSITION CAN BE

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Presentation transcript:

STATE EXPECTATION: P2.1 AN OBJECT’S POSITION CAN BE MEASURED AND GRAPHED AS A FUNCTION OF TIME. AN OBJECT’S SPEED CAN BE CALCULATED AND GRAPHED AS A FUNCTION OF TIME. P2.2 THE MOTION OF AN OBJECT CAN BE DESCRIBED BY ITS POSITION AND VELOCITY AS FUNCTIONS OF TIME AND BY ITS AVERAGE SPEED AND AVERAGE ACCELERATION DURING INTERVALS OF TIME.

MOTION 1. Distance = The length of a path between two points. An object’s distance is how much ground it has covered. Distance is measured in meters. 2. Displacement= An object’s change in position. How far out of place it is.

Comparing distance and displacement:

Think about how distance and displacement would compare for a typical roller coaster ride. 3. Displacement is an example of a vector. A vector is a quantity that has magnitude and direction. Vectors are shown using arrows.

These vectors could be added using vector addition. When would you subtract the vectors? 4. MOTION= A CHANGE IN POSITION.

5. Speed = the ratio of the distance an object moves and the time it takes the object to move. -speed formula: SPEED = DISTANCE TIME -What would be the units for speed? Units = -Speed cannot be measured, it must be calculated.

Each time that you use a formula in Physics First you must apply the same 3 steps: Write out the formula S = D/T Plug in the numbers with their units S = 24m/6sec 3. Correct answer with correct units S = 4 m/sec

6. CONSTANT SPEED – AN OBJECT WHOSE MOVEMENT IS THE SAME SPEED THROUGHOUT. 7. GRAPHING CONSTANT SPEED DISTANCE TIME

- DESCRIBE THE MOTION IN THIS GRAPH. DISTANCE TIME 8. Average Speed = The total distance traveled divided by the total time it took to travel that distance.

*The slope of a line on a distance-time graph is speed.

-Individual parts of a graph can be analyzed to determine speed at a certain time during the journey.

9. VELOCITY DESCRIBES BOTH SPEED AND DIRECTION OF AN OBJECT. Velocity is a vector. -VELOCITY UNITS MAY BE METERS/SECOND WEST FOR EXAMPLE. -A change in velocity can result from a change in speed and/or a change in direction!

10. Types of Motion One Dimensional – Occurs in one plane. Example – walking across the floor. b. Two Dimensional – Occurs in two planes. Example – walking down stairs – walking forward and down at the same time.

11. Direct relationship = when one variable increases, the other also increases OR when one variable decreases, the other also decreases. Example: Speed Formula S = D/T Where speed and distance have a direct relationship Speed = 10m/10s so speed is 1m/s Increase the distance and keep time the same. Speed = 100m/10s so speed now equals 10m/s *Notice that when distance went up, speed also increased.

12. Inverse relationship – When one variable increases, the other decreases. Example – Speed formula – speed and time have an inverse relationship. Speed = 10m/10s so speed = 1m/s Now increase the time while keeping the distance the same. Speed = 10m/100s so speed = .1m/s *Notice that as the time increased, the speed decreased.

13. ACCELERATION – THE RATE OF CHANGE OF VELOCITY. - ACC. = FINAL VEL. -ORIGINAL VEL. TIME - ACCELERATION UNITS ARE METERS/SECOND/SECOND - ACCELERATION GRAPH VELOCITY TIME What is depicted in this graph?