Students will learn the meaning of acceleration, how it is different than velocity and how to calculate average acceleration.
Key Equations
velocity (m/s)
initial velocity
final velocity
change in velocity
- Acceleration is the rate of change of velocity. So in other words, acceleration tells you how quickly the velocity is increasing or decreasing. An acceleration of indicates that the velocity is increasing by in the positive direction every second.
- Deceleration is the term used when an object’s speed (i.e. magnitude of its velocity) is decreasing due to acceleration in the opposite direction of its velocity.
Example 1
A Top Fuel dragster can accelerate from 0 to 100 mph (160 km/hr) in 0.8 seconds. What is the average acceleration in ?
Question:
Given:
Equation:
Plug n’ Chug: Step 1: Convert km/hr to m/s
Step 2: Solve for average acceleration:
Answer:
Watch this Explanation
Simulation
The Moving Man (PhET Simulation)
Time for Practice
- Ms. Reitman’s scooter starts from rest and accelerates at . What is the scooter's velocity after 1s? after 2s? after 7s?
Answers
1. 2 m/s, 4 m/s, 14 m/s