Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Chapter 4A, Problem 6PLA
In the laboratory you are instructed to release the cart from rest for each angle. If the cart were released with a small initial velocity, would it introduce any error in the data? Explain why it would or would not affect the results.
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Prof. K. lives on a steep hill and wants to conduct a Dynamics experiment with her car. She starts
function of velocity and is described by the equation a = 3.22 - 0.04v² where v is the velocity of her
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B
1) How would you expect the height from which one drops the ball to affect the accuracy of the experimentally determined g? What things cause this variation in accuracy, and exactly how do they cause the variation? What trend in g should you observe as drop height increases?
2) How would your experimentally determined g be affected if the height of the object to be dropped were measured from the lower trip plate to the top of the object instead of its bottom? Would this be a systematic or random error, and exactly how would the data indicate this? Explain.
3) Though in this experiment air resistance is considered negligible, suppose that it were not. How would this affect your experimentally determined g? Would this be a personal, systematic or random error? Explain.
4) What is the most obvious, simple change (using the same equipment) that you could make to the experimental procedure to increase the accuracy of the g you determine? (Hint: think about Q1)
Friction
Be able to calculate, for both kinetic and static friction:
a. The frictional force, given the mass and coefficient of friction,
including experimental uncertainty.
b. The coefficient of friction, given the mass and frictional force,
including experimental uncertainty.
c. The mass or the normal force, given the friction coefficient and
the applied frictional force, including experimental uncertainty.
Be able to sketch a force diagram for a block either at rest or sliding, with
friction.
Example 1:
A block of wood with a mass of 220 g (assumed exact) is sitting on a
surface, where the coefficients of static and kinetic friction between the
materials are μ = 0.31±0.01, Mk = 0.22 +0.01.
What force is required to get the block moving? Quote your answer
including an experimental uncertainty. (0.67N ± 0.02N)
Once the block is moving, what horizontal force is required to keep the
block sliding at constant speed? Quote your answer including an
experimental uncertainty. (0.47N ± 0.02N)…
Chapter 4A Solutions
Physics Laboratory Manual
Ch. 4A - These pictures show a cart that is moving at...Ch. 4A - These pictures show a cart that has a positive...Ch. 4A - These pictures show a cart that travels at a...Ch. 4A - These pictures show a cart that has a negative...Ch. 4A - Prob. 5PLACh. 4A - In the laboratory you are instructed to release...Ch. 4A - If a cart is released from rest on a frictionless...
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