There are (one can say) three coequal theories of motion for a single particle: Newton's second law, stating that the total force on the particle causes its acceleration; the work-kinetic energy theorem, stating that the total work on the particle causes its change in kinetic energy; and the impulse-momentum theorem, stating that the total impulse on the particle causes its change in momentum. In this problem, you compare predictions of the three theories in one particular case. A 3.00-kg object has velocity 7.00ĵ m/s. Then, a constant net force 12.0i N acts on the object for 5.00 s. (a) Calculate the object's final velocity, using the impulse-momentum theorem. (b) Calculate its accelera- tion from a = (v,- v,)/At. (c) Calculate its acceleration from a = EF/m. (d) Find the object's vector displacement from Ar = vt + at?. (e) Find the work done on the object from W= F ·AF. (f) Find the final kinetic energy from mv,? = mv,• v,. (g) Find the final kinetic energy from z mv? + W. (h) State the result of comparing the answers to parts (b) and (c), and the answers to parts (f) and (g).

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter8: Momentum And Collisions
Section: Chapter Questions
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There are (one can say) three coequal theories of
motion for a single particle: Newton's second law, stating
that the total force on the particle causes its acceleration;
the work-kinetic energy theorem, stating that the total work
on the particle causes its change in kinetic energy; and the
impulse-momentum theorem, stating that the total impulse
on the particle causes its change in momentum. In this
problem, you compare predictions of the three theories in
one particular case. A 3.00-kg object has velocity 7.00ĵ m/s.
Then, a constant net force 12.0i N acts on the object for
5.00 s. (a) Calculate the object's final velocity, using the
impulse-momentum theorem. (b) Calculate its accelera-
tion from a = (v,- v,)/At. (c) Calculate its acceleration
from a = EF/m. (d) Find the object's vector displacement
from Ar = vt + at?. (e) Find the work done on the object
from W= F ·AF. (f) Find the final kinetic energy from
mv,? = mv,• v,. (g) Find the final kinetic energy from
z mv? + W. (h) State the result of comparing the answers to
parts (b) and (c), and the answers to parts (f) and (g).
Transcribed Image Text:There are (one can say) three coequal theories of motion for a single particle: Newton's second law, stating that the total force on the particle causes its acceleration; the work-kinetic energy theorem, stating that the total work on the particle causes its change in kinetic energy; and the impulse-momentum theorem, stating that the total impulse on the particle causes its change in momentum. In this problem, you compare predictions of the three theories in one particular case. A 3.00-kg object has velocity 7.00ĵ m/s. Then, a constant net force 12.0i N acts on the object for 5.00 s. (a) Calculate the object's final velocity, using the impulse-momentum theorem. (b) Calculate its accelera- tion from a = (v,- v,)/At. (c) Calculate its acceleration from a = EF/m. (d) Find the object's vector displacement from Ar = vt + at?. (e) Find the work done on the object from W= F ·AF. (f) Find the final kinetic energy from mv,? = mv,• v,. (g) Find the final kinetic energy from z mv? + W. (h) State the result of comparing the answers to parts (b) and (c), and the answers to parts (f) and (g).
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