1. An object of mass m rests at the top of a smooth slope of height h, length L and angle 0. The coefficient of kinetic friction ux is small enough that once the object is given a small push, it will slide down the slope. a. Sketch the physical situation, choose a coordinate system and draw a free body diagram for the object. List the knowns and unknowns. (Hint: choosing a coordinate system that is aligned with the motion of the object will make calculations easier.) b. Write down Newton's Second Law for the y motion of the object. Using this determine an expression for the magnitude of the normal force. c. Write down Newton's Second law for the x motion of the object. Using this, and your result from part b, determine an expression for the acceleration of the object down the slope.

Physics for Scientists and Engineers with Modern Physics
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Chapter7: Energy Of A System
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1. An object of mass m rests at the top of a smooth slope of height h, length L and
angle 0. The coefficient of kinetic friction uk is small enough that once the object is
given a small push, it will slide down the slope.
a. Sketch the physical situation, choose a coordinate system and draw a free body
diagram for the object. List the knowns and unknowns. (Hint: choosing a coordinate
system that is aligned with the motion of the object will make calculations easier.)
b. Write down Newton's Second Law for the y motion of the object. Using this
determine an expression for the magnitude of the normal force.
c. Write down Newton's Second law for the x motion of the object. Using this, and
your result from part b, determine an expression for the acceleration of the object
down the slope.
d. Using your knowledge of the kinematic equations, determine an expression for the
object's speed at the bottom of the hill. This should be in terms of some of all of
given known variables m, h, L, g, 0 and µk.
e. Suppose a snowboarder slides down a ski slope of height h = 12.0 m, length L=
100 m and the coefficient of kinetic friction between their board and the snow is
Hk= 0.07. What is the snowboarder's speed at the bottom of the hill? Suppose this
snowboarder has a little sister who is half the mass of her older sibling. What is the
little sister's speed at the bottom of the hill? Does your result make sense? Explain.
Transcribed Image Text:1. An object of mass m rests at the top of a smooth slope of height h, length L and angle 0. The coefficient of kinetic friction uk is small enough that once the object is given a small push, it will slide down the slope. a. Sketch the physical situation, choose a coordinate system and draw a free body diagram for the object. List the knowns and unknowns. (Hint: choosing a coordinate system that is aligned with the motion of the object will make calculations easier.) b. Write down Newton's Second Law for the y motion of the object. Using this determine an expression for the magnitude of the normal force. c. Write down Newton's Second law for the x motion of the object. Using this, and your result from part b, determine an expression for the acceleration of the object down the slope. d. Using your knowledge of the kinematic equations, determine an expression for the object's speed at the bottom of the hill. This should be in terms of some of all of given known variables m, h, L, g, 0 and µk. e. Suppose a snowboarder slides down a ski slope of height h = 12.0 m, length L= 100 m and the coefficient of kinetic friction between their board and the snow is Hk= 0.07. What is the snowboarder's speed at the bottom of the hill? Suppose this snowboarder has a little sister who is half the mass of her older sibling. What is the little sister's speed at the bottom of the hill? Does your result make sense? Explain.
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