Need help in some concept questions

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The discussion revolves around identifying physical concepts related to various scenarios, such as friction, impulse, momentum, and the laws of motion. Participants share their attempts at matching each situation with the appropriate concept, seeking clarification on specific terms like "kick force" and the application of laws in different contexts. There is debate over the classification of certain scenarios, particularly regarding projectile motion and the forces involved in elevator mechanics. The conversation emphasizes the importance of understanding the underlying principles of physics to accurately categorize these situations. Overall, the thread highlights the complexities of applying theoretical concepts to practical examples in physics.
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Homework Statement


A. Friction
B. Impulse
C. Momentum
D. 3rd Law of Motion
E. 2nd Law of Motion
F. 1st Law of Motion
G. Circular Motion
H. Freely Falling
I. Projectile

Homework Equations


Write the letter of the concept/theory under the following physical situation.

1. Truck and car moving with the same speed approaching each other.
2. Sliding a box of books across the library floor.
3. Launching of space shuttle causing rocket propulsion.
4. Pulling up a string attached to a cliff.
5. Contact of soles of shoes and the floor.
6. An LED television set stands on a table.
7. A kick force of a player in a football match.
8. Ripe date fruits falling from the tree.
9. Serving the volleyball in a match.
10. Using the lift (elevator) in going to the different floors of the building.These are just a simple of identification and concept question but I want to be sure of my answer can anyone help? thanks.
 
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What is your attempt
 
This is my attempt:

1. C
2. A
3. D
4. E
5. A
6. F
7. B
8. H
9. I
10. D
 
Last edited:
so0lid said:
3. B - I guess its C+D
7. B isnt it projectile motion ??
10. D How? I guess its E

Rest i think is fine
 
Yeah I changed 3. to D ..
and 7. it could be projectile but what does "kick force[/color]" word mean here.
And 10. look you are correct.

What do you think?!
Thank you for reply. Hope to see any other sure answer.

Edit: I guess 10. is D because when solving question for elevators -especially when moving up or down. we use ∑F = ma. Also the elevator have increasing/decreasing up/down accelerator and not constant, so if we say a mass of a man inside the elevator when going up will push with force the elevator down. In this situation we are using the 3rd Law of motion.
 
Last edited:
so0lid said:
and 7. it could be projectile but what does "kick force[/color]" word mean here

Many others could also have other answers

but i am guessing the answer is the concept which explains majority of concept ... you might be right ...

9. Serving the volleyball in a match.

why not impulse for this ?
 
I edit my last post check please.

and 9. i guess I took it as majority of concept :p
 
so0lid said:
Edit: I guess 10. is D because when solving question for elevators -especially when moving up or down. we use ∑F = ma. Also the elevator have increasing/decreasing up/down accelerator and not constant, so if we say a mass of a man inside the elevator when going up will push with force the elevator down. In this situation we are using the 3rd Law of motion.

∑F = ma is second law
third law is the action reaction pair
 
Aha, thanks anyway. :)
 

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