Recent content by unknown physicist

Homework Statement A block sitting on a flat surface has a us of 0.5. The normal force acting on the block is 10N. If someone pushes the block with a horizontal force of 2N. What is the static friction force acting on the object? Homework Equations F=ma fs=usR (less than or equal to)The...

I said that the first and second are both propositions because being clever means that she understands things very quickly, which could be true or false, therefore a proposition. I said that a^2+b^2=c^2 is a true proposition because it is obviously shown in pythagoras theorem, therefore it is a...

Homework Statement 1. Why is the statement: " Vicky is not clever" Not a mathematical proposition? Provide examples please 2. Why is the statement: "a^2+b^2=c^2 an indeterminate proposition?" 3. Why is the negation of " If a triangle has two equal angles it is isosceles" = "Not all triangles...

Because acceleration in the y dimension, is negative. It can't possibly be negative. So I think it should stay.

Homework Statement The Force applied to an object is equal its mass times its acceleration Assume that the ball has a mass of 40g. What is the force due to gravity acting on the ball? Homework Equations F=ma The Attempt at a Solution F=(.04)(-9.81) I get a negative answer, does that mean...

so how do you suggest i solve them?

Yeah, visualizing them is a bit difficult, I excel in the calculation part. Interpreting them is a bit difficult.

For acceleration vs time graphs, can I consider acceleration to be 0 while computing?

for acceleration, I used v =u+at and I said u=0 a=0 and v=5 I plugged them into the equation and got 5=0? what does that mean? and then for the second part I said u= 5 and v=5 and plugged them and got 5=5??

Hold on, so for the acceleration vs time graph. u =0 and a is a constant. ( for the first part) How would I know what to plug for the v=u+at equations? How would I know that the numbers i'll be plugging in is different that the ones above? I think I can understand the displacement, and...

What do you mean by w.r.t? and how do I understand it mathematically?

the curve will be the s=1/2ut^2 because (u)(t) = 0

yes, I can't seem to understand the acceleration part. Why is it a straight line? then why does it go down?

It is a quadratic, so it should be curved. w.r.t time? But acceleration will be a straight line, then go straight down, to an acceleration of 0, then it will continue to be 0. That is what the answer sheet shows. I can't understand why it is straight, and why it goes down.

so, I should use s=ut+1/2at^2? Also, it accelerates at a constant rate, but why does the graph need to go downward? why doesn't it go up like a slope? (for acceleration)?