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Speed
 Speed = Distance ÷ Time
D_
S T
Example: A car travels 300km in 6 hours.
What is the speed of the car?
Answer:
 Speed = distance ÷ time
 Speed = 300km ÷ 6 hours
 Speed = 50km/hr
More practice
 1. How far can a plane travel if it flies
800km/hr for 9 hours?
 2. How long does it take a ship to go
500 km if it travels at a speed of
50km/hr?
Answer
1. D
S T
D
800 9
800km ▪ 9hrs = 7200km
hr
Answer
2. D
S T
500
50 T
500km ÷ 50km = 10 hrs
hr
Velocity
 Speed in a given direction.
 What is the velocity of a boat that
travels from St. Peter to Mankato
(10 miles) in 15 minutes?
Answer
 Speed = distance ÷ time
 Speed = 10 miles ÷ 15 minutes
 Speed = 0.67 mi/min
 Velocity = 0.67 mi/min South
Change your answer to mi/hr!
 0.67mi/min x 60min/hr =
 40 mi/hr
Distance-time graphs
 On your paper, graph the following:
 D (m) T (sec)
0 0
5 7
10 14
15 21
Was your graph a straight line?
 A distance-time graph which is a
straight line indicates constant
speed.
 In constant speed, the object
does not speed up or slow down.
The acceleration is zero.
Graph the following on a distance-
time graph:
 D (m) T (s)
0 0
5 1
20 2
45 3
80 4
125 5
0 1 2 3 4 5
Was your graph a curve?
 A graph that curves on a
distance-time graph shows that
the object is accelerating
Distance-time graphs
 Describe the motion of the object as
shown in the
graph.
From 0-8 sec,
constant speed:
(25 m/sec);
From 8-12 sec,
no motion;
From 12-16 sec,
acceleration;
From 16-20 sec,
constant speed
Speed-time graphs
 Using the distance-time graph from the
last frame, draw a speed time graph. First
fill in the table below:
Average Speed (m/s) Time (sec)
____ 0 to 8
____ 8 to 12
____ 12 to 20
25
0
37.5
What does your graph look like?
 Constant speed will be a
horizontal line on a speed time
graph.
 If the speed decreases, the line
will slant down.
 If the speed increases, the line
will slant up.

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Motion2

  • 1.
  • 2. Speed  Speed = Distance ÷ Time D_ S T Example: A car travels 300km in 6 hours. What is the speed of the car?
  • 3. Answer:  Speed = distance ÷ time  Speed = 300km ÷ 6 hours  Speed = 50km/hr
  • 4. More practice  1. How far can a plane travel if it flies 800km/hr for 9 hours?  2. How long does it take a ship to go 500 km if it travels at a speed of 50km/hr?
  • 5. Answer 1. D S T D 800 9 800km ▪ 9hrs = 7200km hr
  • 6. Answer 2. D S T 500 50 T 500km ÷ 50km = 10 hrs hr
  • 7. Velocity  Speed in a given direction.  What is the velocity of a boat that travels from St. Peter to Mankato (10 miles) in 15 minutes?
  • 8. Answer  Speed = distance ÷ time  Speed = 10 miles ÷ 15 minutes  Speed = 0.67 mi/min  Velocity = 0.67 mi/min South
  • 9. Change your answer to mi/hr!  0.67mi/min x 60min/hr =  40 mi/hr
  • 10. Distance-time graphs  On your paper, graph the following:  D (m) T (sec) 0 0 5 7 10 14 15 21
  • 11.
  • 12. Was your graph a straight line?  A distance-time graph which is a straight line indicates constant speed.  In constant speed, the object does not speed up or slow down. The acceleration is zero.
  • 13. Graph the following on a distance- time graph:  D (m) T (s) 0 0 5 1 20 2 45 3 80 4 125 5
  • 14. 0 1 2 3 4 5
  • 15. Was your graph a curve?  A graph that curves on a distance-time graph shows that the object is accelerating
  • 16. Distance-time graphs  Describe the motion of the object as shown in the graph. From 0-8 sec, constant speed: (25 m/sec); From 8-12 sec, no motion; From 12-16 sec, acceleration; From 16-20 sec, constant speed
  • 17. Speed-time graphs  Using the distance-time graph from the last frame, draw a speed time graph. First fill in the table below: Average Speed (m/s) Time (sec) ____ 0 to 8 ____ 8 to 12 ____ 12 to 20 25 0 37.5
  • 18. What does your graph look like?  Constant speed will be a horizontal line on a speed time graph.  If the speed decreases, the line will slant down.  If the speed increases, the line will slant up.