GOTW: Sciene and tech game - Page 9

Originally posted by: akhl

Yes your answer is correct.😊

But for the benefit of other members, let me explain the solution in more detail.

When I stand on the scale, then I push the scale down. The force with which I push the ball is the reading of the scale. By Newton's third law, the scale pushes me up with equal magnitude force. So we can also say that the force with which scale pushes me up is the reading of the scale.

Let F1 = force with which scale pushes me up.

When I stand on the scale, then there are two forces on me:-

1. My weight, which is vertically downward

2. F1 vertically upward

I am not accelerating. Therefore upward force=downward force.

F1=weight

F1 is scale reading. This means that scale reading shows my actual weight.

Now I push some object down. Let me push with force F2. Then that object pushes me up with force F2.

Now there are three forces on me:-

1. My weight, which is vertically downward

2. F1 vertically upward

3. F2 vertically upward

I am not accelerating. Therefore upward force=downward force.

F1+F2 = weight

Or F1 = weight - F2

As you can see, this time F2(meaning scale reading) is less than my weight. So scale reading is less.

Originally posted by: its me tan

excellent ,

5 marks to you

@rajnish: i answered stepper motor, mein punkte bitte!

Originally posted by: akhl

Another question from me.😊

A particle is moving in a circular path of radius r. A force of constant magnitude F is continuously acting on the particle. The direction of F is always in the direction in which the particle moves - thus F is tangential.

The particle starts at a point A, goes round the circle and comes back to point A. During this time, what is the work done by the force on the particle?

Originally posted by: rajnish_here

unanswered questions-
1. From Jasleen - What kind of drugs are used in medicines?

Originally posted by: -Mystery-

I don't truly get the intent of the question.... Do you want definition of kind of drugs can be used in medicines or name the drugs that are actually used in medicine?

Because morphine is highly addictive and it's used often to help the patients with severe pain. Also THC or marijuana is sometimes used to aid the cancer treatments.

-Mahi

Originally posted by: akhl

Another question from me.😊

A particle is moving in a circular path of radius r. A force of constant magnitude F is continuously acting on the particle. The direction of F is always in the direction in which the particle moves - thus F is tangential.

The particle starts at a point A, goes round the circle and comes back to point A. During this time, what is the work done by the force on the particle?