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V ELOCITY P RACTICE P ROBLEMS 1. What is the speed of a rocket that travels 9000 meters in seconds? 2. The space shuttle travels 700 m/s. How long will it take it to go 500 kilometers? 3. A plane that travels 180,000 meters in one hour has a speed of _____ m/s. 4. A plane flies 80 km in 10 minutes and then flies 100 km in 20 minutes. What is the average speed of the plane?
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NEWTON’S 1ST LAW OF MOTIONThe Law of Inertia
SPEED: DISTANCE COVERED PER UNIT OF TIME
or Speed = distance/ time
VELOCITY PRACTICE PROBLEMS1. What is the speed of a rocket that
travels 9000 meters in 12.12 seconds?2. The space shuttle travels 700 m/s. How
long will it take it to go 500 kilometers?3. A plane that travels 180,000 meters in
one hour has a speed of _____ m/s. 4. A plane flies 80 km in 10 minutes and
then flies 100 km in 20 minutes. What is the average speed of the plane?
VELOCITY KEY1. 742.6 m/s2. 714.3s3. 50 m/s4. 360 km/hr or 100 m/s
VELOCITY: A VECTOR QUANTITYhttp://ttc.usd306.k12.ks.us/SafeVideos/Video.aspx?id=bsTuhzeS-BE
MOTION IS RELATIVEEverything is always moving. Even when you are “standing still” you are speeding through space.
What is your speed relative to Earth?
What is your speed relative to the Sun?
0m/s
30km/s
GRAPHING MOTIONDistance vs. Time Graphs
GRAPHING VELOCITYIncreasing Speed
GRAPHING VELOCITYAt Rest
GRAPHING VELOCITYAt Rest
INERTIAThe tendency of an object to resist a change in its motion.
An object in a state of uniform motion tends to remain in that state of motion
unless an external net force is applied to it
uniform motion
net force
uniform motion
net force
acceleration
Motion that is not changing/ constant
An unbalanced force that results in acceleration
The rate at which an object’s velocity changes
acceleration
IS REST UNIFORM MOTION?YES…it is a constant velocity of ZERO m/s!
IF AN OBJECT IS ACCELERATING CAN IT HAVE CONSTANT MOTION?No…by definition acceleration is a CHANGE in velocity!
SPORT SCIENCE FORCE VIDEOhttp://www.youtube.com/watch?v=jzYMX_3K_xE&feature=results_video&playnext=1&list=PLB8BB9168E6F5F978
THE GREATER THE VELOCITY THE GREATER THE InertiaRESISTANCE TO A CHANGE IN MOTIONThink about trying to stop a bullet with your hand.
THE GREATER THE MASS THE GREATER THE
Think about trying to push a plane down the runway.
InertiaRESISTANCE TO A CHANGE IN MOTION
CHECK YOUR UNDERSTANDINGPOD #1: Why will the coin drop into the glass when a force accelerates the card?
POD #2: Why does the downward motion and sudden stop of the hammer tighten the hammerhead?
POD #3: Why is it that a slow continuous increase in the downward force breaks the string above the massive ball, but a sudden increase breaks the lower string?
NET FORCEThe Combination of All Forces that act on an object
Applied Forces Net Force
ASTRONOMY APPLICATIONThe earth moves around the sun.
