Catalyst

1
Catalyst

• 1. What is the difference between speed and
  velocity?
• 2. Put these objects in order from slowest to
  fastest
• Peregrine falcon
• Cheetah
• Human
• Car (at the highway speed limit)
• Mako shark
• Ocean wave
• Maglev train

2
Catalyst

• Put these objects in order from slowest to
  fastest
• Peregrine falcon (6, 200 mph)
• Cheetah (5, 70 mph)
• Human (2, 25 mph)
• Car (at the highway speed limit) (4, 60 mph)
• Mako shark (3, 31 mph)
• Ocean wave (1, 4.5 mph)
• Maglev train (7, 350 mph)

3
Speed and Velocity
4
Formulas

• Speed
• speed distance
• time
• s d
• t
• speed of a car is mph miles distance
• hour time

5
Speed vs. Velocity
speed how fast an object is moving Ex 35 m/s velocity how fast an object is moving in a given direction Ex 35 m/s west
6
IFAS Problem Solving

• IFAS
• Info all information given
• Formula - written and ready to use
• Algebra - work shown with numbers and units
• Solution - circled and identified

7
My Example

• Ex1 Calculate the speed for a car that went a
  distance of 120 miles in 2 hours time.
• d120 miles
• t2 hours
• sd/t

s120mi / 2hr s 60 mi/hr or 60 mph
8
Your Example

• Ex2 A baseball is thrown a distance of 60 feet.
  What is its velocity if it takes 5 seconds to
  cover the distance from the pitchers mound to
  home plate?

9
My Example

• Ex3 How much time does it take for a bird flying
  at a velocity of 45 miles per hour south to
  travel a distance of 1,800 miles?

10
Formulas
d
s
t
11
Your Example

• Ex4 A comet is cruising through the solar system
  at a speed of 50,000 km per hour for 4 hours.
  What is the total distance traveled by the comet
  during this time?

12
Graphing Distance vs. Time
Times (s) Distance (m) for Car 1 Distance (m) for Car 2
1 2 3
2 4 6
3 6 9
4 8 12
13
Graphing Distance vs. Time
d
d
d
t
t
t
No Motion
Constant Speed
Increasing Speed
14
Example 5

• Ex5 Every summer I drive to Michigan. It is 3900
  km to get there. If I average 100 km/hr, how much
  time will I spend driving?

15
Example 6

• Ex6 The pitchers mound in baseball is 80 m from
  the plate. It takes 4 seconds for a pitch to
  reach the plate. How fast is the pitch?

16
Example 7

• Ex7 If you run a t 12 m/s for 15 minutes, how
  far will you go?

17
Example 8

• Ex8 A bullet travels at 850 m/s. How long will
  it take a bullet to go 1000 m?