PHYSICS

MOTION ENDURING UNDERSTANDINGS: An object is in motion if its distance from a reference point is changing.An object is in motion if its distance from a reference point is changing. Speed is the distance traveled divided by the time traveled. V = d  tSpeed is the distance traveled divided by the time traveled. V = d  t Acceleration is the rate at which velocity changes.Acceleration is the rate at which velocity changes.

INTERNATIONAL SYSTEM OF UNITS The SI is based on the number 10.The SI is based on the number 10. The basic unit of length is the meterThe basic unit of length is the meter The basic unit of volume is the literThe basic unit of volume is the liter The basic unit of mass is the gramThe basic unit of mass is the gram The basic unit of temperature is CelsiusThe basic unit of temperature is Celsius

THE METRIC LADDER kilo hecto deko meter, liter centi milli deci ,000

RELATIVE MOTION Relative Motion depends on your point of view.Relative Motion depends on your point of view. An object is in motion if its distance from a reference point is changing.An object is in motion if its distance from a reference point is changing. Stand perfectly still. Are you in motion? Stand perfectly still. Are you in motion? From your point of view – no. From your point of view – no. But if viewed from space, you would be moving at But if viewed from space, you would be moving at about 1,000 mph with the rotation of the Earth! about 1,000 mph with the rotation of the Earth!

SPEED Speed is the distance traveled divided by the time.Speed is the distance traveled divided by the time. speed = distance / time speed = distance / time Average speed = total distance / total time: add all the distances and divide by the total time.Average speed = total distance / total time: add all the distances and divide by the total time. 32 km + 13 km = 45 km 32 km + 13 km = 45 km 2 hrs + 1 hr = 3 hrs 2 hrs + 1 hr = 3 hrs Instantaneous speed is the rate an object is moving at a given instant in time.Instantaneous speed is the rate an object is moving at a given instant in time. 45 km / 3 hrs = 15 km/hr

ACCELERATION Acceleration is any change in speedAcceleration is any change in speed Acceleration can be a decrease in speed, increase in speed, or a change in directionAcceleration can be a decrease in speed, increase in speed, or a change in direction

Try it... Sam rides his bike 4 miles to Sylvan’s house. It takes him 20 minutes. What was Sam’s average velocity?Sam rides his bike 4 miles to Sylvan’s house. It takes him 20 minutes. What was Sam’s average velocity? V = 4 mi / 20 min V = 4 mi / 20 min V =.2 mi/min V =.2 mi/min What is Sam’s velocity in miles per hour?What is Sam’s velocity in miles per hour? V = x = 12.0 mi/hr.2 mi 1 min 60 min 1 hr 1 hr

If Sylvan rode to Sam’s house averaging 15 mi/hr, how long would it take him to go the 4 miles?If Sylvan rode to Sam’s house averaging 15 mi/hr, how long would it take him to go the 4 miles? T = =.2666hr T = =.2666hr How many minutes did it take Sylvan?How many minutes did it take Sylvan? T =.2666hr x = 16 min What was Sylvan’s speed in kilometers per hour?What was Sylvan’s speed in kilometers per hour? x = km/hr x = km/hr 4 mi 15mi/hr 60 min 60 min 1 hr 1 hr 15mi 1.61km 1mi 1mi