Kinematics of Particles: Understanding Motion in Physics
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/s
2
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
Explore the concepts of rectilinear motion, analytical relationships of velocity and acceleration, and solve practical problems involving acceleration and distance calculations in physics. Dive into scenarios such as a car race, a baseball player running to first base, and a subway train braking between stops. Enhance your understanding of motion in physics through various examples and exercises.
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Presentation Transcript
Chapter 2 kinematics of particles Class Lecture 2: Tuesday, August 25, 2015 Today s Objective: Rectilinear motion
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/s2and 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.
Problem 2/48 A subway train travels between two of its stops with the acceleration schedule shown. Determine the time interval ? during which the train brakes to a stop with deceleration of 2 m/s2 and find the distance s between stations.
