Three videos include 1. A mass on a spring 2. A bicycle in motion 3. Two carts m

Question

Three videos include

1.  A mass on a spring

2. A bicycle in motion

3. Two carts moving left to right

(a) Which of these four objects [Upper Fan Cart, Lower Cart, Mass on a Spring, and/or Bicycle], if any, have a constant velocity? Cite the evidence for your conclusions.

(b) Which of the four objects, if any, move at a non-zero constant acceleration? Cite the evidence for your conclusion.

(c) Which of these four objects, if any, have neither a constant velocity or a constant acceleration? Cite the evidence for your conclusions.

(d) The kinematic equations are very useful for describing motions. Which of the four motions, if any, cannot be described using these kinematic equations? Explain the reasons for your answer.

e)      What do you think is the most convincing test of whether the one-dimensional motion of an object has a constant acceleration?

Explanation / Answer

(a) carts/bicycle depending on video. Mass on spring cannot be because spring does not produce a uniform acceleration. It gives a variable force

(b) carts/bicycle leaving the answers in (a)

(c) Mass on spring. Because force of spring is propotional to compression/elongation of spring and hence the mass doesn't have a constant velocity or acceleration

(d)kinematic equations can be described for constant vel/accn motion. So, other than mass on spring, all others can be described using kinematic equations.

(e)There is a constant force on the object. Or, the speed increases by equal amounts in equal intervals of time.

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