Hello forum, Vaironl here.(adsbygoogle = window.adsbygoogle || []).push({});

I believe this will be harsh thing to ask for but I will post about 3 different long problems (Easy problems) in this thread.

I don't understand a couple of things in my physics class since I arrived from a trip about 2weeks ago and missed a lot of import information.

I just need help finding things I don't know.

Thanks in advance.

Note, for some reason my book list things in kgm/s and I must convert to newtons but I thought newtons are kgm/s^2, you guys will understand what am talking about when you read the problems

Problem 1:

(a) What is the momentum of an 8kg bowling ball rolling at 2m/s?

8kg * 2m/s = 16kgm/s

(b) If the bowling ball rolls into a pillow and stops in 0.5s, calculate the average force it exerts on the pillow?

Ft= MΔV

F(0.5s) = 8kg * -2m/s

F(0.5s) = -1kgm/s

F = -32kgm/s or -32N ? how can I correctly do this calculation

(c) What average force does the pillow exert on the ball?

32N ?

Problem2:

(a)What is the momentum of a 50kg carton that slides at 4m/s across an icy surface?

50kg*4m/s = 200 kgm/s

(b)The sliding carton skids onto a rough surface and stops in 3s. Calculate the force of friction it encounters

Ft=mΔv

F(3s) = 50kg*-4m/s

F=67N? Again I don't know how can taking seconds from kgm/s converts this to Newtons

if possible can someone please provide me with instructions on how kgm/s transfer into Newtons.

Problem3:

(a)What impulse occurs when an average force of 10N is exerted on cart for 2.5s?

Impulse = FΔt

= 10N(-2.5s)

= 25N/s

(b)What change in momentum does the cart undergo?

P=M*V

(c)If the mass of the cart is 2kg and the cart is initially at rest, calculate it's final speed.

M=2kg V=0m/s

I can't even think about what solution its for this one.

Please if possible don't give me the answers but guide me closely to them (Sounds weird)

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# Homework Help: Finding momentum, friction, and forces

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