Transcript ME101 Lecture 2

Chapter 2 – kinematics of particles
Class Lecture 2: Tuesday, August 25, 2015
Today’s Objective:
Rectilinear motion
RECTILINEAR MOTION
Analytical Relationship of s-v-a
When Acceleration is constant
Problem 2.14
• In the pinewood-derby event shown, the car is released from rest at the
starting position A and then rolls down the incline and on to the finish line
C. If the constant acceleration down the incline is 9 ft/s2 and the speed from
B to C is constant, determine the time duration for the race. The effects of
the small transition area can be neglected.
Problem 2. 15
Starting from rest at home plate, a baseball player runs to first base (80 ft
away). He uniformly accelerates over the first 10 ft to his maximum
speed, which is then maintained until he crosses first base. If the overall
run is completed in 4 sec, determine his maximum speed, the acceleration
over the first 10 ft, and time duration of the acceleration.
s, v, a Curves
Problem 2/48
A subway train travels between two of its stops with the acceleration schedule
shown. Determine the time interval ∆𝑡 during which the train brakes to a stop
with deceleration of 2 m/s2 and find the distance s between stations.