Unit 3 Slideshow 2 Motion is a measure of CHANGES IN POSITION, as marked by HOW FAR, HOW LONG, and HOW FAST an object travels.

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Presentation transcript:

Unit 3 Slideshow 2 Motion is a measure of CHANGES IN POSITION, as marked by HOW FAR, HOW LONG, and HOW FAST an object travels.

 FASTEST PRODUCTION CAR  LINKLINK  FASTEST LAND MAMMAL  LINKLINK  FASTEST WING SPEED  LINKLINK  FASTEST ANIMALS SLOWED DOWN  LINKLINK  FASTEST RUBIX CUBE  LINKLINK  FASTEST HANDS  LINKLINK  FASTEST EVERYTHING  LINKLINK

 SCALAR VS. VECTOR  SCALAR QUANTITIES  DISTANCE  TYPES OF SPEED  SPEED CALCULATIONS  DISTANCE-TIME GRAPHS  SPEED-TIME GRAPHS

 SCALAR QUANTITIES  Any quantity that has MAGNITUDE (size) and UNITS, but NO DIRECTION.  EXAMPLES: ▪ Time2.5 h ▪ Speed 25 m/s ▪ Mass5.0 kg ▪ Distance42 m

 VECTOR QUANTITIES  Any quantity that has MAGNITUDE (size) and UNITS, and DIRECTION.  Direction is symbolized by putting an ARROW above the symbol for a quantity. ▪ Ex: velocity has the symbol v  EXAMPLES: ▪ Velocity 25 m/s [R] ▪ Weight50 N [D] ▪ Displacement42 m [W33 o N]

 CONSTANT SPEED (Δv)  AKA UNIFORM MOTION  When an object is travelling at constant speed, it is travelling at the SAME SPEED for a period of time.  EXAMPLE ▪ Cruise control ▪ Speed of light in air is c = 3.00 x 10 8 m/s

 AVERAGE SPEED (v av )  A measure of the TOTAL distance over TOTAL time.  V av = d TOTAL = d T t TOTAL = t T  INSTANTANEOUS SPEED (v inst )  A measure of the speed at a particular MOMENT in time.  Instantaneous speed is NOT affected by an object’s PREVIOUS SPEED or HOW LONG is has been moving.  EXAMPLE: ▪ Speedometer ▪ Police Radar Gun

 When doing physics problems, follow the following guidelines:  READ PROBLEM (i.e., don’t just pick out the numbers)!  Write GIVENS and UNKNOWNS.  Write EQUATION FIRST, rearranging if necessary.  Plug in numbers and solve for answer.  Write answer in SIG FIGS, with UNITS, and CIRCLE it!

 Since the SPEED equation has only 3 VARIABLES, you can easily rearrange it using the following helpful “triangle.” Χ ÷ Δv = ? Δd = ? Δt = ?

 _____________ wants to ride his bike from Corner Brook to Deer Lake, a distance of 45 km. If he only has 0.50 h to get there, what speed does he have to travel?

 _____________ wants to ride her bike from Corner Brook to Deer Lake, a distance of 45 km. Unlike ____________, she calculated her average speed to be 20.0 km/h. How long will it take her to get there?

 ______________ is travelling for a triathlon and ran at a speed of 15 km/h for 2.0 h. What distance has he travelled?

 On her scooter, ______________ travels 12 km in 2.5 h and then 15 km in 35.5 minutes. What is her average speed?

 Do the Worksheets 7 and 8 (page 20-21)in your handout for homework!!!

the truck? v car = 90 km/h = 25 m/s v truck = 50 km/h = 14 m/s d = 100 m t for car to reach truck = ? d truck = d car vt = vt 14t = 25t 100 = 11t 9 = t t= 9 s