Do Now Time (sec.) Position (meters) 00 1.53 37 4.510.2 614.5 7.517 1)Calculate the average speed.

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Presentation transcript:

Do Now Time (sec.) Position (meters) )Calculate the average speed

Aim: How can we identify distance & displacement? 1) Convert 3.4x10 -5 Gigavolt to volts. 2) Convert 9.0 grams to milligrams.

Introduction to Kinematics  Kinematics is a branch of physics which deals with the motion of an object without reference to the forces which act on the system. (velocity, speed, acceleration, distance, displacement)

Terminology All quantities in physics are classified under two categories: vectors and scalars. All quantities in physics are classified under two categories: vectors and scalars. Vector – a quantity that has both magnitude and direction. Vector – a quantity that has both magnitude and direction. Velocity, acceleration, displacement, force. Velocity, acceleration, displacement, force. Scalar – a quantity that has ONLY magnitude. Scalar – a quantity that has ONLY magnitude. Speed, distance, mass, time. Speed, distance, mass, time.

Situation  Imagine taking a trip to buffalo. Describe some ways to measure how far you traveled.  Use some system of measurement (feet, inches, meters, furlongs, etc) to determine how far you have traveled. Use some system of measurement to determine how far you are from where you started. Use some system of measurement to determine how far you are from where you started. Are they the same?? Are they the same??

 Distance – is the total length of a path that an object travels.  Scalar quantity, units meters (m).  Displacement – is a change in a position from its starting point to its end point. [straight line path]**  Vector quantity, units meters (m).

Aim: How can we apply the average velocity formula? 1) List four vectors and scalars. 2) Explain the difference between a vector and a scalar. 3) Dr. House limps 15 meters west then 4 meters east then 9 meters west. A) Calculate his total distance traveled. A) Calculate his total distance traveled. B) Calculate his total displacement. B) Calculate his total displacement.

Speed and Velocity  Speed  Units (meters per second) m/s  Velocity  Units (meter per second) m/s  Velocity is a vector!!!!!!

Examples A car travels between the 50-meter and 150-meter markers on a highway in 10 seconds. Calculate the average speed of the car. A car travels between the 50-meter and 150-meter markers on a highway in 10 seconds. Calculate the average speed of the car.

A car travels 100 meters north in 10 seconds and then travels 20 meters south in 2 seconds. A car travels 100 meters north in 10 seconds and then travels 20 meters south in 2 seconds. A) Calculate the average velocity. A) Calculate the average velocity. B) Calculate the average speed. B) Calculate the average speed. C) Compare A and B. C) Compare A and B.

The two average velocity formulas….

Example A ball starting at rest rolls down a 4 meter ramp. At the end of the ramp the ball’s speed is 25 meters per second. Determine the average velocity. A ball starting at rest rolls down a 4 meter ramp. At the end of the ramp the ball’s speed is 25 meters per second. Determine the average velocity.