Chapter 5: Q. 12 (page 127)
Newton’s second law says . So is role="math" localid="1650733973680" a force? Explain.
Short Answer
No, But it is called the superposition force.
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Chapter 5: Q. 12 (page 127)
Newton’s second law says . So is role="math" localid="1650733973680" a force? Explain.
No, But it is called the superposition force.
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Suppose you press your physics book against a wall hard enough to keep it from moving. Does the friction force on the book point
(a) into the wall,
(b) out of the wall,
(c) up,
(d) down, or
(e) is there no friction force? Explain.
In lab, you propel a cart with four known forces while using an
ultrasonic motion detector to measure the cart’s acceleration. Your data are as follows:

a. How should you graph these data so as to determine the mass of the cart from the slope of the line? That is, what values
should you graph on the horizontal axis and what on the
vertical axis?
b. Is there another data point that would be reasonable to add,
even though you made no measurements? If so, what is it?
c. What is your best determination of the cart’s mass?
Two rubber bands cause an object to accelerate with acceleration . How many rubber bands are needed to cause an object with half the mass to accelerate three times as quickly?
FIGURE shows acceleration-versus-force graphs for two
objects pulled by rubber bands. What is the mass ratio ?
Is it possible for the friction force on an object to be in the direction of motion? If so, give an example. If not, why not?
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