2.00
Linear Motion
Reading: Chapter 2, Page 660-661
Chapter Two - Key Terms
Acceleration Average time Elapsed Time
Freefall Instantaneous speed Rate
Relative Speed Velocity
Chapter 2 Objectives:
When you have completed Chapter 2, you should be able to:
- ... recognize that a rate is a quantity divided by a time interval.
- ... distinguish between average speed and instantaneous speed, between speed and velocity.
- ... calculate the average speed of an object (given displacement and time interval) and recognize appropriate speed units.
- ... discuss what is meant by the statement " motion is relative".
- ... identify when an object's velocity is changing and when acceleration occurs.
- ... differentiate between velocity and acceleration.
- ... calculate the acceleration of an object (given change in velocity and time interval) and recognize appropriate acceleration units.
- ... solve numerical problems involving objects having velocity and acceleration.
- ... state the acceleration of an object in free fall near the earth's surface in metric and "English" units.
- ... recognize that the acceleration of an object in free fall is constant.
- ... solve problems involving objects in freefall
- ... discuss the effect of air resistance on falling objects in terms of distance traveled and velocity.
Massachusetts Frameworks
1) Distinguish between, and solve problems involving, velocity, speed, and constant acceleration.
2) Create and interpret graphs of motion (position vs. time, speed vs. time, velocity vs. time, constant acceleration vs. time).
i. Interpret graphs and translate information. Calculate slope.
3) Identify appropriate standard international units of measurement for distance, speed, acceleration, and time and explain how they are measured.
Variable / Symbol / Unit / SignTime / t / Second, s / Can only be +
Position / x / Meter, m / Can be + or –
Distance / Dx / Meter, m / Can be + or -
Velocity / v = Dx/Dt / m/s / Can be + or -
Acceleration / a= Dv/Dt / m/s/s or m/s2 / Can be + or -
Basic Formulas:
Velocity - v = Dx/t acceleration – a = Dv/t
For constant acceleration Dx = 1/2aDt2
Homework – Define the Key Terms
Acceleration -______Average time - ______
Elapsed Time - ______
Freefall - ______
Instantaneous speed - ______
Rate - ______
Relative- ______
Speed - ______Velocity - ______
Write the formulas for velocity and acceleration