3. A 15 kg block is pushed from rest across the floor with a force of 51 N. A) What is the acceleration of the block? B) After traveling 12 m, what is the velocity of the block?
3. A 15 kg block is pushed from rest across the floor with a force of 51 N. A) What is the acceleration of the block? B) After traveling 12 m, what is the velocity of the block?
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Question answer for #3
Transcribed Image Text:Background:
Kinematics is the study of motion. Kinetics is the study of what causes motion. If the
motion has a constant acceleration, then some useful mathematical relationships can be
derived:
Constant Acceleration Equations
v = v; + at
Definition of Work
W = FAx
1
zat
v} = v} + 2aAx
Ax = v;t +
Definition of Kinetic Energy
KE = mv²
%3D
Newton's Second Law
Work-Kinetic Energy Theorem
W = AKE
F = ma
Objective:
Get acquainted with the constant acceleration equations, Newton's 2nd Law of motion, and
Work and Energy. Learn to apply these equations to solve problems in 1-D.
Procedure:
Perform the indicated calculations. Use a coordinate system always; use a Free Body
Diagram (FBD) when necessary.
1. A ball is thrown straight into the air with an initial velocity of 28 m/s. A) How high does
the ball get? B) How long does it take for the ball to get to its maximum height?
2. A ball is dropped from a height of 20 m above the ground. A) How much time does it
take to reach the ground? B) What is the velocity of the ball right before it hits the
ground?
3. A 15 kg block is pushed from rest across the floor with a force of 51 N. A) What is the
acceleration of the block? B) After traveling 12 m, what is the velocity of the block?
4. Calculate the work done on the block in Problem 3 using two methods:
a. Definition of Work.
b. Work-Kinetic Energy Theorem.
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