Spring Scale Readings for MassesSpring Scales Mass Force !

[mr.mair]

Spring Scales Mass Force !

Homework Statement

This is 2 questions.

1.A student hangs a 500.0g mass on a spring scale. Correct two significant digits, state the reading on the scale when the the mass and the scale are

(a) Stationary
(B) Being Lifted Upward at constant velocity
(c)realesed so they fall downward freely

2. A student 65kg can safetly lift 73% of the students own mass off the floor?
(a) Determine the mass the student can lift on earth

Homework Equations

Fg=mg

The Attempt at a Solution

First Question the stationary I put

Fg= mg
Fg=(0.5)(9.8)
Fg= 4.9N

 

[Piglet1024]

Question seems to simply be (65kg)(0.73) since mass is independent of gravity or what planet one is on.

 

[Torquescrew]

(B) Being Lifted Upward at constant velocity

Well... For part B, if it's moving at a constant velocity (as opposed to a constant acceleration), shouldn't make a difference, right?

I mean, if something is moving at a constant velocity, then that means there are no net forces acting on it. And that would mean that the only force actually acting on the weight and scale would be gravity itself.

 

[mr.mair]

thanks guys