Chapter 5
Work and Energy
Energy of a falling 75g Egg
0.80 0.70 0.60 Energy (J) 0.50 0.40 0.30 0.20 0.10 0.00 0.00 0.10 0.20 Time (sec) 0.30 0.40 PEg (J) KE (J) ME (J)
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Concept Check - Work
Is i
Torque, Rotational Equilibrium & Simple Machines
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Objectives
Distinguish between torque and force. Calculate the magnitude of a torque on an object. Identify the six types of simple machines. Ca
Objectives
Relate the concepts of energy, time, and power. Calculate power in two different ways. Explain the effect of machines on work and power.
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Concept Check - Power
Mike applied 10 N of fo
Objectives AT: Rotation & Inertia
Identify the center of mass of an object. Distinguish between mass and moment of inertia.
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Center of Mass
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Objectives
Compare the momentum of different moving objects. Compare the momentum of the same object moving with different velocities. Identify examples of change in the momentum of an object. Describe changes in momentum in terms of force and time.
Copyr
Objectives
Identify several forms of energy. Calculate kinetic energy for an object. Apply the workkinetic energy theorem to solve problems. Distinguish between kinetic and potential energy. Classify different types of potential energy. Calculate the pote
Objectives AT: Rotational Dynamics
Define the second condition of equilibrium. Solve problems involving the first and second conditions of equilibrium. Describe Newtons second law for rotation. Calculate the angular momentum for various rotating objects.
Objectives
Describe the interaction between two objects in terms of the change in momentum of each object. Compare the total momentum of two objects before and after they interact. State the law of conservation of momentum. Predict the final velocities of
Objectives
Identify situations in which conservation of mechanical energy is valid. Recognize the forms that conserved energy can take. Solve problems using conservation of mechanical energy.
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C
Objectives
Identify different types of collisions. Determine the changes in kinetic energy during perfectly inelastic collisions. Compare conservation of momentum and conservation of kinetic energy in perfectly inelastic and elastic collisions. Find the f
Weight
Fg=mag
ag = 9.81 m/s2
Comparing Mass and Weight
Normal Force
The normal force acts on a surface in a direction perpendicular to the surface. y Fn Fa Ff Fg,y
x Fg
Fx = Fa + Ff + Fg , x = max Fy = Fn Fg , y = ma y = 0
Fg,x
Fn = Fg , y
Normal Force
F
Concept Check Cart on Track
Consider a cart on a horizontal frictionless table. Once the cart has been given a push and released, what will happen to the cart? 1. slowly come to a stop 2. continue with constant acceleration 3. continue with decreasing acc
Concept Check Newtons 1st Law
A book is lying at rest on a table. The book will remain there at rest because: 1. there is a net force but the book has too much inertia 2. there are no forces acting on it at all 3. it does move, but too slowly to be seen 4
Mechanics
Mechanics Kinematics Dynamics
Objectives
Describe how force affects the motion of an object. Interpret and construct free body diagrams.
Force
Comparing Contact and Field Forces
Force Diagrams
Force Diagram
Free-Body Diagram
In a force diagram,
Objectives
Recognize examples of projectile motion. Describe the path of a projectile as a parabola. Resolve vectors into their components and apply the kinematic equations to solve problems involving projectile motion.
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Objectives
Identify appropriate coordinate systems for solving problems with vectors. Apply the Pythagorean theorem and tangent function to calculate the magnitude and direction of a resultant vector. Resolve vectors into components using the sine and cos
Objectives
Distinguish between a scalar and a vector. Add and subtract vectors by using the graphical method. Multiply and divide vectors by scalars.
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Scalars and Vectors
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Objectives
Relate the motion of a freely falling body to motion with constant acceleration. Calculate displacement, velocity, and time at various points in the motion of a freely falling object. Compare the motions of different objects in free fall.
Copyr
Objectives
Describe motion in terms of changing velocity. Compare graphical representations of accelerated and nonaccelerated motions. Apply kinematic equations to calculate distance, time, or velocity under conditions of constant acceleration.
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Topics of Physics
Physics
Mechanics
Thermodynamics
Vibrations and Wave Phenomena
Optics
Electromagnetism
Relativity
Quantum
Kinematics
Dynamics
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Mechanics
Mechanics
Kinematics
Dynamics
How Fast?