Download Chapter 4-5 Review Ideas and Concepts You Are Responsible For

Chapter 4-5 Review
Ideas and Concepts You Are Responsible For
4.1.
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4.4.
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4.5.
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4.7.
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5.1.
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5.3.
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Development of Force Concept
Understand the definition of force.
Newton’s First Law of Motion: Inertia
Define mass and inertia.
Understand Newton's first law of motion.
Newton’s Second Law of Motion: Concept of a System
Define net force, external force, and system.
Understand Newton’s second law of motion.
Apply Newton’s second law to determine the weight of an object.
Newton’s Third Law of Motion: Symmetry in Forces
Understand Newton's third law of motion.
Apply Newton's third law to define systems and solve problems of motion.
Normal, Tension, and Other Examples of Forces
Define normal and tension forces.
Apply Newton's laws of motion to solve problems involving a variety of forces.
Use trigonometric identities to resolve weight into components.
Further Applications of Newton’s Laws of Motion
Apply problem-solving techniques to solve for quantities in more complex systems
of forces.
Integrate concepts from kinematics to solve problems using Newton's laws of
motion.
Friction
Discuss the general characteristics of friction.
Describe the various types of friction.
Calculate the magnitude of static and kinetic friction.
Drag Forces
Express mathematically the drag force.
Discuss the applications of drag force.
Define terminal velocity.
Determine the terminal velocity given mass.
Elasticity: Stress and Strain
State Hooke’s law.
Explain Hooke’s law using graphical representation between deformation and
applied force.
Key Ideas
1. List as many consequences as you can of Fnet = 0.
2. Mass and Weight
A. What’s another word for inertia?
B. What changes between the Earth and Moon … mass or weight?
C. What is the weight of 100-N block?
D. What is the weight of a 60-kg person?
E. What is the mass of 10-N piece of iron?
3. Elevator Problems
A. What is the tension in the cable of a 500-kg elevator moving upwards at a constant
velocity of 10 m/s?
B. What is the tension in the cable of a 500-kg elevator accelerating downwards at 4
m/s2?
C. What would the bathroom scale read of a 600-N person on an elevator accelerating
upwards at 2 m/s2?
4. Normal Force
A. What is the normal force of a mass m on a horizontal surface?
B. What is the normal force of a mass m on a surface inclined at an angle ?
5. Friction Force
A. Write the equation for Ff that always holds, whether on a horizontal or tilted surface?
B. For a mass m on a horizontal surface, Ff =
C. For a mass m on a surface inclined at an angle , Ff =
D. For a block of mass m and a coefficient of friction , what force must be applied to
move the block at a constant velocity on a horizontal surface?
E. For a mass m on a surface inclined at an angle  with a coefficient of friction , what is
the acceleration down the plane?
6. Pulley Problems
A. For a mass m1 on a frictionless horizontal surface attached by a massless string over a
pulley to mass m2 that is hanging, what is the acceleration of the blocks?
B. For a mass m1 on a horizontal surface with friction attached by a massless string over a
pulley to mass m2 that is hanging, what is the acceleration of the blocks?
C. At what mass m2 would the blocks in 6.B. move with constant velocity?
7. Tension Question: Two blocks m1 and m2 are attached by a massless string. They are pulled
along with a force F by a string attached to m2.
A. What is the acceleration of the blocks?
B. What is the tension in the string connecting blocks m1 and m2?
8. Free Body Diagrams – Show and label all of the forces (no components)
A. Draw the free body diagram of a sky diver falling at terminal velocity.
B. Draw the free body diagram of a block sitting on an inclined plane with friction.