1) Newton’s first law states that an object at rest will remain at rest and an o
ID: 1530886 • Letter: 1
Question
1) Newton’s first law states that an object at rest will remain at rest and an object in motion will continue moving at the same speed and in the same direction unless acted upon by an external force. Are there forces acting on the marble as it rolls down the incline? If so, which one(s)?
2) Does the marble’s velocity increase, decrease, or remain constant as it rolls down the ramp? Explain with reference to your data.
3) Does the marble’s acceleration increase, decrease, or remain the same as it rolls down the ramp? Why is this the case?
4) What would you expect to happen to the value of the marble’s acceleration if the ramp was steeper? [If you have trouble answering this, repeat the experiment with a steeper ramp.]
5) When driving with a friend you set your sunglasses on the dashboard of his car right by the windshield in front of you. He says you shouldn’t do that because if he suddenly slams on his brakes it will fly back and hit you in the face. Does this make sense? Why or why not?
6) A fragment of rock breaks off from a cliff and falls. Ignoring air resistance, what would you expect its speed be after one second of falling? After two seconds? Why?
7) Suppose you join a mission to Mars, where the acceleration of gravity is gM = 3.71 2. How would you expect the results of your experiment to differ?
Height of Ramp 0.048 m Angle of Incline 20 TRIAL Distance (x) m Time (t) s Velocity (v) m/s Acceleration (a) m/s2 o. 0.428 0.507 21 03 1.339 0.448 0.335 3 0.3 1.19 11 0.504 0.423 0.3 1.22 0.403 0.492 51 0.3 1.328 0.452 0340 Average 1.2524 Average 0.480 Average 0.386 61 0.61 1.879 0.639 0.340 7 0.6 1.86 0.645 0.347 8 0.6 1.983 0.305 0.605 91 0.6 .721 0.697 0.405 101 0.6 1.921 0.325 0.625 Average 0.344 Average 1.8728 Average 0.642 1 0.9 2.342 0.769 0.328 12 0.9 2.454 0.733 0.299 131 0.9 2.353 0.765 0.325 0.299 2.452 15 0.91 2.314 0.778 0.336 Average 2.383 Average 0.756 Average 0.318Explanation / Answer
Q1.
forces acting on the marble are :
a) weight of the marble, in vertical downward direction
b) normal force from the incline, along 90 degree to the inclince
c) friction force, in opposite direction to the motion
Q2.
velocity increases as you can see that as the distance increases, velocity increases from 0.48 m/s to 0.642 m/s to 0.756 m/s
Q3.
acceleration remains the same as forces acting on the marble are constant.
Q4.
when ramp is steeper, normal force which is proportional to cosine of the angle of the inclince with horizontal decreases
hence friction force decreases
and net force increases.
so acceleration increases.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.