Circular Motion | GCSE Physics | Doodle Science

GCSE Science

Doodle Science teaches you high school physics in a less boring way in almost no time!

Script:
Circular motion is quite self-explanatory really; it’s simply the physics behind things moving in circles. When something moves in a circle it’s velocity is constantly changing, even if its speed is constant. This is because velocity is both speed and direction. So since the direction is constantly changing, its velocity is also constantly changing and so the object must be accelerating; and this acceleration is towards the centre of the circle. If there is acceleration, this there must be a force producing it; and this resultant force is called the centripetal force and also acts towards the centre of the circle.

A car going around a bend is an example of circular motion. The friction between the car’s tyres and the road produces the centripetal force. Without the friction, the car would fly off at a tangent. Another example of circular motion is how the moon orbits the Earth. The gravitational attraction between the moon and the earth is the centripetal force.

The magnitude of the centripetal force depends on the speed, mass and the radius of the circle the object is travelling around. The faster the object is moving, the greater the centripetal force has to be to keep it in circular motion. An object of grater mass also needs a greater centripetal force to keep it moving in a circle. And if the object is moving in a smaller circle, the centripetal force has to be bigger because the object is effectively changing direction more quickly and therefore needs a greater force to produce a greater acceleration. Hopefully that helped you get your head around it (pun intended).

References:
2. CGP GCSE Physics AQA Revision Guide.

[savageanimator]

The video on this topic wasn't present on Cognito Edu so I chose your channel as the second best 😊😊

[adharshs]

simple quick explanatory neat informative lifesaving love this

[DullestPizza]

Not just an amazing video, but a top tier joke at the end 👌 thanks 👍

[hoangtran]

I've learned about circular motion back in high school but I can't seem to recall all of the information, your video helped a lot. Also, I was hoping you would mention that the curve roads are not flat but incline at a certain angel. I remember hearing my teacher mentioned that if the road is flat, the cars would fly out.

[helendeacon]

legend, probs gonna save my exam tomorrow

[sahilchadha]

the magnitude of force on moon going around earth only depends on the distance from earths center

[savageanimator]

Thanks for your quick explanation, and my fast Wi-Fi otherwise the yt video loading will move in circular motion 😝😝

[gudscene]

Why is it accelerating toward the center?

[burt]

What happened with the other guy who used to read the scripts?

[avamaliz]

So is the velocity of the moon up or down im sooo gone rn