Two dimensions. In Figure 13-34, three point particles are fixed in place in an xy plane.
Particle A has mass mA = 6 g, particle B has mass 2.00mA, and particle C has mass
3.00mA. A fourth particle D, with mass 4.00mA, is to be placed near the other three
v
m
p
p = mv
Linear Momentum :
!
!
Linear momentum p of a particle of mass m and velocity v
!
!
is defined as p = mv.
The SI unit for linear momentum is the kg.m/s.
Below we will prove the following statement: The time rate of change of the
linear momentu
Chapter 7
Kinetic Energy and Work
! Kinetic energy of a moving object
! Work done by a force
! Work-Kinetic Energy Theorem
! Power
Kinetic Energy: A new physical parameter to describe the state of motion of
an object with mass m and SPEED v.
mv 2
K=
.
2
I
Static friction followed by kinetic friction
Applied force
Before the box slides, static friction acts. But once it starts to slide,
kinetic friction acts.
time
Some approximate coefficients of friction
k is smaller or equal to s
Friction in horizontal m
Work done by a spring
Figure below shows how a spring does work on a block as it is
stretched and compressed.
Elastic potential energy
A body is elastic if it returns
to its original shape after
being deformed.
Elastic potential energy is
the energy st
Momentum and
Its Conservation
SECTION 1 Impulse
and Momentum
Objectives
Explain what is meant by momentum recognizing that it is a vector
quantity.
Compare the momentum of different moving objects, and same
object moving with different velocities
Deter
G11 Core
T3 Week 1
Impulse-Momentum Theorem
Write the letter of the correct answer in the space provided.
1. Which conditions will result in the smallest change in momentum?
a. a large force over a long time period
b. a large force over a short time perio
Lexus sold the most luxury autos in the U.S. for a second straight month in
March, closing in on Mercedes-Benzs first-quarter lead, even as sales
slipped 2.8 percent, weighed down by a 14 percent drop in deliveries of
cars. But SUV sales rose 14 percent -
In a longitudinal wave, the compressions and rarefactions travel in
a. the same direction that the wave travels.
b. a direction opposite to the wave travel.
c. neither.
Answer.A