PHY 111 Chapter 5 Part 3 Lecture

# PHY 111 Chapter 5 Part 3 Lecture - μ s = 0.5 and μ k =...

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Chapter 5 – contd

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Question 1. Which of the following statements about mass and weight is correct? A. Your mass is a measure of the force gravity exerts on you. B. Your mass is the same everywhere in the universe. C. Your weight is the same everywhere in the universe. D. Your weight is a measure of your resistance of being accelerated.
1. The apparent weight of an object is A. the pull of gravity on the object. B. the object’s mass times the acceleration of gravity. C. the magnitude of the contact force that supports the object. D. the pull of gravity on an object that is accelerating upward. Question

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1. The coefficient of static friction is A. smaller than the coefficient of kinetic friction. B. equal to the coefficient of kinetic friction. C. larger than the coefficient of kinetic friction. D. not discussed in this chapter. Question
A car traveling at 20 m/s stops in a distance of 50 m. Assume that the deaceleration is constant. The coefficients of friction between a passenger and the seat are

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Unformatted text preview: μ s = 0.5 and μ k = 0.3. Will a 70 kg passenger slide off the seat if not wearing a seat belt? A wooden box, with a mass of 22 kg, is pulled at a constant speed with a rope that makes an angle of 25° with the wooden floor. What is the tension in the rope? Use kinetic friction coefficient of wood on wood 0.2. An object at rest on an inclined plane starts to slide when the incline angle is increased to 17°. What is the coefficient of static friction between the object and the incline? A 6.0 kg box slides down an inclined plane that makes an angle of 39° with the horizontal. If the coefficient of kinetic friction is 0.19, at what rate does the box accelerate down the slope? You push downward on a trunk at an angle 25° below the horizontal with a force of 750 N. If the trunk is on a flat surface and the coefficient of static friction is 0.76, what is the most massive trunk you will be able to move?...
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PHY 111 Chapter 5 Part 3 Lecture - μ s = 0.5 and μ k =...

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