Motion. Objectives Define motion. Calculate the speed of a moving object. Distinguish between velocity and acceleration.

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Presentation transcript:

Motion

Objectives Define motion. Calculate the speed of a moving object. Distinguish between velocity and acceleration.

Begin How do you feel when you are standing on a stopped bus and then the bus begins to move? Why?

Motion The change in position of an object as compared with a reference point.

Reference Point A location to which you compare to other locations

Question Car A is going 45 mph in the left lane. Car B is going 45 mph in the right lane directly along side car A. Is car B in motion relative to car A? Explain.

Relative Motion e_share/vis_sim/mfm05_pg7_relmotion/mf m05_pg7_relmotion.htmlhttp:// e_share/vis_sim/mfm05_pg7_relmotion/mf m05_pg7_relmotion.html

Not All Motion Is the Same All motion is not the same.

Activity Differentiate between the motion of a baseball and a jet.

Distance The length of the actual path traveled by an object. A car travels 50 km. A baseball travels 60 feet and 6 inches.

Activity Restate the definition of distance in your own words and give an example of distance. Write your answer in your notes.

Speed The distance an object travels in a given amount of time. A car travels 50 km in one hour. A baseball travels 85 miles per hour.

Calculating Speed The formula R=D/T is used to calculate speed. R is speed (or rate), d is distance, and t is time.

Activity If a runner runs 100 meters in 50 seconds, what is his speed in meters per second? How far could this runner run in 40 seconds?

Velocity definite directionSpeed in a definite direction. 65 km/hour describes speed. 65 km/hour north describes velocity.

Velocity Two objects can have the same speed but have different velocities. 70 mph north and 70 mph south.

Acceleration Acceleration is a change in velocity in a period of time.

Which of the Following Are Examples of Acceleration? A car stops at a stop light. A car goes from 0 to 45 mph. A car races around an oval track at a constant speed.

Acceleration Acceleration is any change (speed or direction) in an objects motion. Acceleration can be negative.

Acceleration of Objects in Free Fall The acceleration of an object in free fall on earth is 9.8 m/s 2. This means that in each second the speed of the object will increase by 9.8 m/s 2.

Calculating Acceleration Use the following formula: A= V final -V initial ________________ t A= acceleration V= velocity T= time

Calculating Acceleration John starts sliding with a velocity of 1 m/s. After 3 s, his velocity is 7 m/s. What is John’s acceleration?

Review What is the difference between speed and velocity? A train travels 85 km in 1.5 hours. What is the speed of the train?

Review What is the difference between velocity and acceleration? If the moon travels at a constant speed around the earth, would the moon’s velocity also be constant? Why?