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# PH 121 5.1-5.2

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## Richard Datwyler

on 16 May 2018

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#### Transcript of PH 121 5.1-5.2

Forces!!
What are some classic examples of forces?
4 main types of forces
Gravity
Electromagnetic
Strong nuclear
Weak nuclear
How many forces are
acting on this frog
A. 1
B. 2
C. 3
D. 4
E. 5
" Match the following."

1. Causes the force
2. Is acted upon
3. Requires objects to touch
4. Requires no immediate proximity

a. Long-Range force
b. Contact force
c. Agent
d. object"
"So Kinematics and Dynamics are just subbranch's of Mechanics?"
"Can you go over what net force is?"
" I just want to know if we are going to keep using all the formulas we used the last chapter"
"How many types of force are there?"
"what causes gravity to be a long distance force? How is it pushing down?"
"i understand net forces is the addition of forces but how do they really work?like I was trying to solve the stop to think problem 4.1 but I don't understand how I can solve it"
"Which one is which: are normal forces always perpendicular and friction always tangent to the surface being acted upon? or is it the other way around?"
" Could you explain tension force? I didn't quite understand the concept behind it."
What forces are acting on a ball after it has been kicked and is rolling across the floor?
What forces are there on a car parked on a hill?
A jet is accelerating down the run way, what forces are acting on it? (don't neglect air resistance)
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