I wish I had a teach like you when I was in school.

@Thelearninglouge

Жыл бұрын

Same

Playing games in science class! this is not just a complete fun but by learning the physics behind the game you'll be more likely to win every time (or at least most of the time). Welcome back Mr. Bruce,💯

Bruce is an incredible human being.

Bruce, I really thought that what you're demonstrating is the centrifugal effect. The best demonstration of what I believe to be centripetal force is when I sat on a rotating bar stool as a kid and spun. Even if I tried to lean to one side, I could feel the inertial forces pushing me back upright, like the gyroscopic effect. In order to keep rotating at the same revolutions per second, my head and shoulders would have had to accelerate in order to leave the axis of rotation. Of course this can be overcome, once you overcome the rotational inertia of the rest of the system. That conflict between the rotational inertia of my lower body and the lack of energy for making my head and shoulders move faster (while keeping the same rpm) provides that light force which holds me at the axis of rotation. When I read the definition of centripetal force, it seems to describe this phenomenon. I'll have to devise some experiments to prove my hypothesis.

You're a genius! This game looks like SO MUCH fun!!

5:21 Seeing him with that swing on the roof was hilarious. Never seen any teachers do this stuff

You are amazing teacher

Cool as always, Bruce!

As always, great stuff, Mr Yeany. :)

Love this stuff. Each experiment causes me to think of alternatives to it to do other things.

Thanks for enriching us, see you next month, I hope.

Always excellent

Excellent!!!

Splendid.

A cylinder of mass M length I and radius r is thrown from a height h vertically towards the ground. After hitting the ground it loses energy E due to dissipative forces and it jumps while rotating about its horizontal axis and gets landed perfectly in vertical position. Find the minimum height h for it to complete one full rotation? {Neglect the energy losses due to air drag And neglect the height attained after jump}

awesome!!

👏👏👏

`Do you know the gravity of the centripetal games the children are allowed to do? :-)

🌷🌟🌷

Aren't the most of experiments demonstrate centrifugal, not centripetal, force?

@fizyka.nietylkodlaorlow

Жыл бұрын

No. From the inertial (non-accelerating) reference frame we talk about the centripetal force. This force forces objects to go in circles. The centrifugal force appears in non-inertial frames. Suppose you are moving in a circle. In this case, you introduce the centrifugal force to explain why you are being pushed outside.

@YeanyScience

Жыл бұрын

You could use them to describe both, centripetal is an actual force applied to the center of rotation causing the object to move in a curved path, as I described, once the centripetal force is no longer applied the object moves away in a straight path which is the description of inertia. Centrifugal force is the tendency for object following a curved path to fly outwards, away from the center of the curve, not actually a force; it is the result from inertia.

@fizyka.nietylkodlaorlow

Жыл бұрын

@@YeanyScience One needs to be careful here. There is a lot of confusion about these two forces. Take the Sun-Earth system. The gravity from the Sun acting on the Earth is exactly our centripetal force. This force is directed towards the Sun. If we observe the system from the Sun's reference frame there is no centrifugal force. Now we choose to describe the system from the Earth's reference frame (which is an accelerating frame). In this frame the Earth is not moving. Now we have a problem. There is still gravity from the Sun but the Earth is not getting closer to the Sun. In this frame one needs to introduce the centrifugal force to cancel the gravitational force from the Sun. The centrifugal force is an inertial force (also called fictitious) that appears to act in a rotating frame of reference.

@CaptainTardigrade

Жыл бұрын

@@fizyka.nietylkodlaorlow Thank you. Yes, you are absolutely correct, it depends on the frame of reference type. My point was just about the fact, that I used to think about centripetal force as a rope tension (in case you a rotating something around you) or gravity force. But in case of wooden hoop example, it just was a bit weird to call collision with a wall centripetal force )

And steel nuts