What Are the Effects of Gravity on a 55.0 kg Ball?

[tica86]

1)What is the weight of a ball of mass 55.0 kg?
I know the answer is 55.0*9.8
but for the following two question I don't get it :/

2)What is the magnitude of the gravitational force acting on it?

Would that be 9.8??


3)What force would a spring scale read if the ball were hanging from it?


Anyone please respond to question 2 and 3, thanks!

 

[The legend]

for part two your answer(9.8) is wrong.It's acceleration... but you need force ... how can you relate them and get what you want?

for part 3...
in general,what does a spring scale indicate?
after answering this you will get the answer easily.

 

[jmb88korean]

force= mass x acceleration. weight= mass x gravity. in this case they would be the same

 

[tica86]

Ok, just to be sure:


2) I'm still confused. Force is directly proportional to acceleration, correct?
So the magnitude of the gravitational force is 539?



3) A spring scale indicates weight. The spring scale would read 55 kg??

 

[The legend]

Ok, just to be sure:


2) I'm still confused. Force is directly proportional to acceleration, correct?
So the magnitude of the gravitational force is 539?



3) A spring scale indicates weight. The spring scale would read 55 kg??

part 2 is right
part 3 ... you know what spring scale indicates(weight) but what you have written as your answer is something else.

 

[fizzynoob]

were talking magnitudes here, force is not a vector in your case. so your force vector is

F = (55*9.8)j

|F| =\sqrt{539^{2}} = 539

that might seem irrelevant, but when your forces have two components that's the process you need to do to find the magnitude.

 

[tica86]

part 2 is right
part 3 ... you know what spring scale indicates(weight) but what you have written as your answer is something else.

So for question 3 it would also be 539 N?