Monday, 9/27/15 OBJECTIVE: SWBAT Differentiate between speed and velocity and distance and displacement. Essential Question: How can we describe an object’s.

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Presentation transcript:

Monday, 9/27/15 OBJECTIVE: SWBAT Differentiate between speed and velocity and distance and displacement. Essential Question: How can we describe an object’s motion? Topic: Linear Motion

“Physics is the natural science that involves the study of matter and its motion through space and time” – Motion happens all around us: Cars, people, soccer balls, etc.

What is motion? Motion- change of the position of an object with respect to time

Distance Distance (d) – how far an object travels. – Does not depend on direction. Imagine an ant crawling along a ruler. What distance did the ant travel? – d = 3 cm cm

Distance: EXAMPLE Distance does not depend on direction. Let ’ s follow the ant again. What distance did the ant walk this time? d = 7 cm cm

Displacement Displacement– difference between an object ’ s final position and its starting position. – DOES depend on direction. Displacement = final position – initial position In order to define displacement, we need directions. Examples of directions: – + and – – N, S, E, W – Angles

cm Displacement: EXAMPLE Let ’ s revisit our ant, and this time we ’ ll find his displacement. Distance: 3 cm Displacement: +3 cm – The positive gives the ant a direction!

Displacement: EXAMPLE Find the distance and displacement of the ant. Distance: 7 cm Displacement: +3 cm cm

Check for Understanding: Displacement vs. Distance An athlete runs around a track that is 100 meters long three times, then stops. – What is the athlete ’ s distance and displacement? Distance = 300 m Displacement = 0 m Why?

Speed Speed (s) – Rate at which an object is moving. speed = distance time s = d t Like distance, speed does not depend on direction.

Speed- EXAMPLE A car drives 100 meters in 5 seconds. What is the car ’ s average speed? – s = d/t – s = (100 m) / (5 s) = 20 m/s 100 m 1 s2 s3 s4 s5 s

Check For Understanding: Speed A rocket is traveling at 10 km/s. How long does it take the rocket to travel 30 km?

Velocity Velocity (v) – speed with direction. velocity = displacement time

Pulling It All Together Back to our ant explorer! – Distance traveled: 7 cm – Displacement: +3 cm – Average speed: (7 cm) / (5 s) = 1.4 cm/s – Average velocity: (+3 cm) / (5 s) = +0.6 cm/s cm s2 s3 s4 s5 s

The GUESS Method During football practice, Martin and Jesus run 2.7 miles eastward in 25 minutes. How fast were they running? G iven U nknown E quation S ubstitute S olve 2.7 miles = d, 25 minutes = t velocity v = d/t v = 2.7 miles/25 minutes v = miles/min, Eastward

Finish the 5 problems on the back of your C-Notes Check your work with your elbow partner You MUST use the GUESS method and show all of your work!! (you need to get in this habit) Pay attention to the units!!

Tuesday: Under Construction…