Name: _____________________________________ Class: _____ Motion 11.2 Speed and Velocity

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# Name: _____________________________________ Class: _____ Motion 11.2 Speed and Velocity - PowerPoint PPT Presentation

Name: _____________________________________ Class: _____ Motion 11.2 Speed and Velocity. Chapter 11. What are we going to learn?. Identify types of speed Calculate the speed of an object. Speed.

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### Name: _____________________________________ Class: _____Motion11.2 Speed and Velocity

Chapter 11

What are we going to learn?
• Identify types of speed
• Calculate the speed of an object
Speed
• The _________ of the ______________ an object moves to the ______________________ the object moves
• 2 types: _____________ and ________________________

Average Speed

• _________________________ traveled ____________________ the _________ it takes to travel that distance
• _________________________ is computed for the ______________________________ of a trip
_________________ for average speed is:

Instantaneous Speed

• __________ at which an object is ______________ at a given _________________________
• Instantaneous speed is __________________ at a _____________________________

Speed Graphs

• The _________ of a line on a ____________________ _______________________ is ____________
Velocity
• Description of both ___________ and ___________________ of motion
• _____________ is a ____________
• A __________ in ____________ can be the ___________________ a change in ___________, a change in _______________, or __________
________________________ velocities _________ by ______________________________
• A __________ on a river heads _________________

___________ the river. The _____________ is moving _______________ to the river banks, so the _______ does _______ land on the bank __________________

___________ from the starting location.

• The _________________________ of the boat is the ___________________ of the ___________________ plus the ___________________.
• The boat starts at Point ____ and heads ___________ Point ____ but ____________ the opposite ________ of the river at Point ____.
A __________ on a river heads __________________

___________ the river. The ____________ is moving _______________ to the river banks, so the _______ does _______ land on the bank __________________

____________ from the starting location.

• The _________________________ of the boat is the ___________________ of the ___________________ plus the ____________________.
• The boat starts at Point ____ and heads ___________ Point ____ but _____________ the opposite ________ of the river at Point ____.
The ________ required for the boat to cross the river from one side to the other side _______________ on the _________________ and the _____________________________________
• If the ____________________ is __________ and the ______________________ is ___________, the ___________________________ could be determined to be _________ using the Pythagorean Theorem (_________________________)
• The boat velocity is ____, river velocity is _____, then the resultant velocity is ____
• a = ____ m/s and b = ____ m/s
a2 + b2 = c2

42 + 32 = c2

____ + ____ = c2

√¯ ____ = c

____= c

• The resultant velocity is 5 m/s
• The time (t) required for the boat to cross a 60-meter wide river (d) would be dependent upon the boat velocity of 4 m/s (v)
• If _______________ then _______________ so

t = d / v = (60 m) / (4 m/s) = 15 seconds

• It would require 15 seconds to cross the 60-meter wide river
The teacher walks 4 meters East, 2 meters South, 4 meters West, and finally 2 meters North. The entire motion lasted for 24 seconds.
• Determine the average speed and the average velocity.

Average Speed

• To determine average speed:

d = _______ meters

t = _______ seconds

average speed = d/t

= ____________

= ________ m/s

*

Average Velocity
• Average velocity is displacement (speed with change in direction)/time ________________
• The displacement is _____ meters
• Average velocity = __________________
• Average velocity = ___________
• The skier moves from A to B to C to D.
• Determine the average speed and average velocity of the skier during these 3 minutes.
• Remember: Add up the distances for speed Add up the displacements for velocity
• Average speed = ____________________
• Average velocity = _____________________
A football coach is pacing back and forth along the sidelines from position A to B to C to D.
• What is the coach's average speed and average velocity?
• Average speed = ____________________
• Average velocity = _____________________
Questions...
• Define speed: ___________________________________________

_____________________________________________

• The SI units for speed are ______________________
• How is instantaneous speed different from average speed?

______________________________________________________________________________________________________________________________________________________________________________

• The equation used for calculating average speed is ______________________________________________________________________________________
True or false?

You can determine how fast you were going at the midpoint of a trip by calculating average speed for the entire trip. __________________________________

• A student walked 1.5 km in 25 minutes, and then, realizing he was late, ran the remaining 0.5 km in 5 minutes. Calculate his average speed on the way to school.

___________________________________________________________________________________________________________________________________

• What type of speed does an automobile’s speedometer display? ___________________________________________
The slope of a line on a distance-time graph represents ________________.
• How do speed and velocity differ?

______________________________________________________________________________________________________________________________________________________________________________

• Circle the letter of each sentence that describes a change in velocity.

a. A moving object gains speed.

b. A moving object changes direction.

c. A moving object moves in a straight line at a constant speed.

d. A moving object slows down.

True or false?

If a car travels around a gentle curve on a highway at 60 km/h, the velocity does not change.

• How do velocities combine?

___________________________________________________________________________________________________________________________________

• A river flows at a velocity of 3 km/h relative to the riverbank. A boat moves upstream at a velocity of 15 km/h relative to the river. What is the velocity of the boat relative to the riverbank?

a. 18 km/h downstream b. 15 km/h upstream

c. 12 km/h upstream d. 12 km/h downstream

A person jogs 4.0 km in 32 min, then 2.0 km in 22 min, and finally 1.0 km in 16 min. What is the jogger’s average speed in km/min? _____________________

___________________________________________

• A train travels 190 km in 3.0 hr, and then 120 km in 2.0 hr. What is its average speed? _______________

___________________________________________

• A car travels 85 km from point A to point B, then 45 km from B to C. The total trip took 1.5 hr. What was the average speed of the car?___________________

___________________________________________

• A bicyclist travels for 1.5 hr at an average speed of 32 km/hr. How far does the bicyclist travel in that time?

________________________________________________________________________________________

Draw and label a line showing the slope of a constant high speed (A), constant low speed (B), and varying speed (C) on the graph below.
Does a car’s speedometer show instantaneous speed, average speed, or velocity? Explain.

________________________________________________________________________________________

• Describe an experiment you could perform to determine the average speed of a toy car rolling down an incline.

______________________________________________________________________________________________________________________________________________________________________________

• A plane’s average speed between 2 cities is 600 km/h. If the trip takes 2.5 hours, how far does the plane fly?

________________________________________________________________________________________