Speed and velocity.

Slides:



Advertisements
Similar presentations
SPEED AND VELOCITY NOTES
Advertisements

(c) McGraw Hill Ryerson Average Velocity Speed ( ) is the distance an object travels during a given time interval divided by the time interval.
In Motion! Rates of change. Rate of Change The word rate means with respect to time (i.e. your rate of pay is in $/hour, or $/month, or $/year. If you.
Motion in One Dimension Kinematics. Distance vs. Displacement Distance – how far you’ve traveled Scalar quantity - 20 m Displacement – shortest distance.
Vocab Concepts AP Problems Problems II Problems Graphical Analysis
How Far? _________ (d) ______________________________________ To get to the store go 2-miles east, turn right and go 3-miles south. How far will you travel.
5 meters in 1 second: 5 m/sec 10 meters in 2 seconds: 5 m/sec 20 meters in 10 seconds: 2 m/sec Biking Speeds:
Physics MOTION Motion Diagrams n A series of images of a moving object that records its position after equal time intervals n *see the pictures in your.
Velocity and Speed. Mechanics Branch of physics that studies motion Two parts Kinematics – describes motion Dynamics – tells why motion occurs.
Relationship between time, displacement, velocity, acceleration. Kinematic.
Speed, Velocity, Displacement, Distance By Tammy Hsu and Viona Chung.
Velocity is a vector quantity therefore must include direction.
Test Review Week 3 CCA What is the average velocity during the 6 s to 8 s interval? a. 12 m/s b. 13 m/sc. 0 m/sd. 14 m/s Question: The table.
Speed and Velocity.
Motion in One Dimension Ch 2. Read and Define  Take Home Lab #1  Read Chapter 2  Complete the 6 vocabulary on page 67.
What is wrong with this picture?. What would a vector arrow look like for someone traveling 35 mph?
Chapter 3.1 Notes Rate. The speed of an object is the ratio of distance in a given time. The speed of an object is the ratio of distance in a given.
Section 4.1 Speed & Velocity b What is motion? A change in the position of an object relative to another object (a reference point), which is assumed to.
REVIEW.  Vector quantities have both ____ and _____.  Scalar quantities have ____ only.
Speed: Average Velocity: Instantaneous Velocity:
Motion, Speed, & Velocity. Motion Motion is a change in position (relative to a reference point) *reference point- stationary (still) object.
Kinematics. Kinematics-What is it? Kinematics is the study of motion. –Motion is always defined in terms of change in location.  Locations or Positions.
DISTANCE VS DISPLACEMENT SPEED VS VELOCITY. DISTANCE – scalar quantity DISPLACEMENT – vector quantity A car travels 50 km to the East and then 20 km to.
1.2 Speed and Velocity.
Motion- Chapter 1 pp Speed- a measure of how fast something is moving. Equation- Speed = distance time You have to MEMORIZE this one!
B1.2 Velocity.
Chapter 1: Matter in Motion  Motion= a change in position over time  Reference point= an object that stays in place and shows us that something is moving.
Motion in One Dimension - velocity. Motion – A change in position Motion.
Describing Motion.
Chapter 2 Describing Motion.
1. If you travel at 10mph for 1 hour, how far do you travel?
Motion Motion - the displacement of an object in relation to objects that are considered to be stationary.
8.2 Average Velocity.
Physics Section 3.1 Represent quantities using vectors
Motion.
Speed, Distance, Time Calculations
Calculating Velocity Honors Physics.
Notes Section DISPLACEMENT AND VELOCITY
Velocity is a vector quantity and must include direction.
A Question of Maths Instructions: Choose a number to answer a question
Kinematics in one dimension
Speed & Velocity.
Speed & Velocity Outcomes:
A car travels a distance of 665miles at
Reviewing Main Ideas Describing Motion
Speed & Velocity Chapter 5.2.
Speed is a scalar quantity because it has no direction.
Speed, Distance, and Displacement Problems
Velocity is a vector quantity and must include direction.
Speed, Distance, Time Calculations
#13 Speed and Momentum. #13 Speed and Momentum.
Speed, Distance, Time Calculations
Speed, Distance, Time Calculations
8.2 Average Velocity: Calculating The rate and Direction of movement
SCI 10 Physics Speed and Velocity.
Speed, Distance, Time Calculations
Speed, Distance, Time Calculations
An object travels 40 miles in 2 hrs. Calculate its speed?
Speed, velocity and acceleration
Why Vectors? A vector allows us to describe both a quantity and a direction of an object. A vector is a quantity that has both magnitude and direction.
Speed, Distance, Time Calculations
Speed, Distance, Time Calculations Final Review
Speed, Distance, Time Calculations
What is Speed? Speed: The ratio of the distance an object moves to the amount of time an object moves Average Speed: Speed over the course of the ENTIRE.
Speed and Velocity 11.2.
Unit 1: Intro to Physics Speed & Velocity.
In this section you will:
11.2 Speed and Velocity.
Speed, Distance, Time Calculations
Introduction to One-Dimensional Motion
Presentation transcript:

Speed and velocity

Speed and velocity Speed is a scalar quantity and can be an average or instantaneous value. For example - If you drove to Vancouver (approximately 400 km away) in 4 hours your average speed would be 100km/hr. But at any given time your instantaneous speed could be more or less than 100 km/hr.

Equations v = d , where d = change in position (distance) t t = time interval

Example 1 A family travels for 60 miles at 20 miles per hour on a dirt road, and then travels another 60 miles at 60 mph on the pavement in order to get home from a camping trip. What is the average speed for the entire trip? Plan: What do we need to know? What do we need to find first? Would drawing it out help?

To complete this….. We must find the total time taken and the distance travelled for each part of the journey first, then apply the equation.

Example 2 A person travels for two hours at 30 miles per hour on horseback and then travels for one hour at 15 mph. What is the person’s average speed?

Average velocity Average velocity is calculated in the same manner as average speed only instead of distance we use the displacement (a vector). average velocity is a vector quantity which means the answer must have a direction associated with it. v = d , where d = change in position (displacement) t t = time interval

Example 3 A car moves due east at 30 km/h for 45 min, turns around, and moves due west at 40 km/h for 60 minutes. What is the average velocity for the entire trip? Plan: in this case it is important to draw out what the car is doing in order to find the total displacement, since it moves in opposite direction.

Example 3 …..the plan from the example: initially: 30 km/h for 45 minutes east. Find displacement 22.5 km[E] then: 40 km/h for 60 minutes west. Find displacement 40 km [W]

Vector additions When vector diagrams are used, the vectors (arrows) are placed tip to tail. d = +22.5km + (-40km) d= -17.5 km or 17.5 km [W] Pi Pf