NOTES ON KINETIC ENERGY AND WORK-ENERGY THEOREM
K=
12 mv Kinetic Energy 2
wnet = K f K i = K Work-Energy Theorem
a) Kinetic energy is energy associated with the motion of a particle. b) The SI unit of
PHYSICS
KHAN
01/27/16
One Dimensional Motion
Distance is defined to be the magnitude or size of displacement between two positions.
Note that the distance between two positions is not the same as the
Khan Kinematic formulas and projectile motion
-Average Velocity for Constant Acceleration
-Acceleration of aircraft carrier takeof
-Deriving displacement as a function of time, acceleration, and initi
Chapter 2 (Week 1) Notes
PHYS 151L/170L
September 1, 2016
Take attendance.
Discuss syllabus and Chapter 1.
Every weekend, notes for the upcoming lab will be posted on Laulima.
Dimensions and Units
The
150 g small
150 g large
100 g small
100 g large
distance of faT1
78
78
78
78
T2
4.56
3.23
5.68
4
T3
4.53
3.31
5.59
4.09
T4
4.43
3.2
5.65
3.98
T5
4.56
3.28
5.62
4.07
4.53
3.31
5.69
4
Avg T
sdm
Accelera
Physics 151
Spring 2017
Lecture-Tutorial for Lecture #15A Mon. Feb. 13
Inclines
Read: OpenStax 4.5: Inclines
1. A block of mass m sits on a frictionless inclined plane of angle . After the block is re
Physics 151
Spring 2017
Lecture-Tutorial for Lecture #14 Fri. Feb. 10
Surface/Contact Friction
Read: OpenStax 5.1: Surface Friction
1. For a sliding object, the friction force acting on it always poin
OBJECTS IN FREE-FALL Def: An object in free-fall is any object that is moving freely under the influence of gravity alone, regardless of its initial position and velocity.
g
9.8 m / s 2 Acceleration o
VECTORS DEF: A vector is a quantity that has both magnitude and direction. DEF: A scalar is a quantity that has magnitude but NO direction. Ex. Vectors Force Velocity Displacement Momentum Ex. Scalars
POTENTIAL ENERGY
Often the work done on a system of two or more objects does not change the kinetic energy of the system but instead it is stored as a new type of energy called POTENTIAL ENERGY. To de
SCALAR (DOT) PRODUCT Before we define work in physics we need to first define the scalar (dot) product between two vectors. The reason for this is because we will define work in terms of the scalar (d
Spring Force
How do we calculate the work done by a non-constant force? Before we answer the question lets consider the spring force which is an example of a nonconstant force. Consider the following
Collisions
Def: A collision is an event in which 2 or more objects interact for a very short period of time. During this time, the external forces (if any) on the system are much smaller than the inte
FRICTION
One type of force that we have not yet considered is that due to friction. The following situations demonstrate the two types of frictional forces we will be considering static and kinetic fr
Law of Gravitation In 1687 Isaac Newton published his Law of Gravitation which is stated mathematically in the following form:
Fg =
Gm1m2 r2
Law of Gravitation
G = 6.672 1011
Fg
Nm 2 kg 2
(Gravitation
MOMENT OF INERTIA
I = mi ri 2 Moment of Inertia
The rotational KE can now be expressed in terms of the Moment of Inertia:
KR =
12 I Rotational Kinetic Energy 2
a) The SI unit of I is the kg m2 b) I is
NEWTONS LAWS OF MOTION Newtons Laws are the foundation of Classical (Newtonian) Mechanics. They were published by Isaac Newton in 1687 along with the law of gravitation in the Principia. They have far