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1.What are the forces acting on the block when it is hanging freely from the spring scale? What is the net force on the block? What are the magnitudes of each of the forces acting on the block? Explain.

 

 

So for the above  question, Im confused how I would find the magnitude specfically?

 Nov 7, 2019
 #1
avatar+1400 
+2

I would also like to mention , the weight of the block on the scale is 55.8 newtons

 Nov 7, 2019
 #2
avatar+19950 
+4

If the block has any unbalanced forces acting on it, it will move. SInce it is hanging and not moving it has no net force, it will have a downward force of

f=ma     this force will exactly equal the upward spring force of kd      (k = spring constant    d = stretch of spring).

 

One is a downward force (say 'negative') the other is an upward force (say 'positive') but the MAGNITUDES are equal and they balance/cancel each other...so there is no net force acting on the block (net force = 0)

 

 

Addition:  55.8 newtons downward       and  55.8 newtons upwards are the forces acting on the block.  NET force = 0

 Nov 7, 2019
edited by ElectricPavlov  Nov 7, 2019
 #3
avatar+1400 
+2

So, the magnitute equals 55.8 since its the force of the downward and upward forces? Is that what your saying?

 

Wouldnt i then need to solve for f=ma, How would I solve for f=ma using the 55.8 newtons?

jjennylove  Nov 7, 2019
 #4
avatar+19950 
+3

Downaward force = -55.8 N

Upward force = + 55.8 N                       Both have magnitude = 55.8

 

f= ma

55.8 = m (9.81)      will let you calculate the mass of the object, but it isn't asked.

 Nov 7, 2019
 #5
avatar+1400 
+2

ohhh okay makes sense, thank you !!

jjennylove  Nov 8, 2019

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