1.The neighborhood joker comes up to you and is really on a roll this morning. A
ID: 1574692 • Letter: 1
Question
1.The neighborhood joker comes up to you and is really on a roll this morning. After several “good ones” they then say “OK so you’re taking physics, right? Here’s one – if the acceleration of gravity is 9.8 m/s2 then why isn’t everything accelerating? HAHAHA”. Being a dedicated student you give this question some real thought and come up with a reasonable response. You might say
All things really do accelerate but we accelerate with them so we can’t tell.
Gravity acts only on things that are not touching a surface.
Gravity is just part of the story and it is the total net external force that determines acceleration.
Most objects have too much inertia for us to see them accelerate under the influence of gravity
2.
Suppose a tree branch falls down to the ground with constant acceleration and takes 2 seconds to hit the ground. Which of the following statements regarding the path of the branch is true?
It covers the same distance during the first second as it does during the last second.
It covers more distance during the last second.
It covers less distance during the last second.
Its acceleration is increasing during the time it falls
Gravity acts only on things that are not touching a surface.
Gravity is just part of the story and it is the total net external force that determines acceleration.
Most objects have too much inertia for us to see them accelerate under the influence of gravity
3.
Consider a 100 kg Father and his 20 kg girl. They decide to enjoy balancing on a seesaw, which is a uniform board 4 m long and pivoted exactly at its center. If girl sits at the seesaw’s end (2m from the center), how far from the center on the other side should the father sit?
Farther out than the board will allow.
0.5 m
0.4 m
1.5 m
Explanation / Answer
(1) The correct answer is "Gravity is just part of the story and it is the total net external force that determines acceleration.".
Option (c) is correct.
(2) The correct answer is "It covers the same distance during the first second as it does during the last second."
Option (a) is correct.
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