Please pick up a bowling ball. Hold it at arms length, head high.
Does it not upon due examination turn out that YOU, yes YOU, were holding the ball up?
And what happened to the ball? Did it not achieve of it's own volition the lowest potential energy state available...
Not at all.
A car on a hill will roll down the hill. It is the brake, acting continuously, that prevents the car from rolling.
A magnet stuck to a fridge would, if not for the magnetic force, fall to the floor.
In both cases friction, STATIC friction... acts continuously to prevent...
A magnet stuck to a fridge is not at rest. It's just stuck. A car parked on an incline is not at rest. It's just parked. I specifically mentioned that.
And to emphasize, Friction is the force that Resists relative motion between objects in contact.
It can do so successfully. When that...
Mass of proton : 1.672 621 777 x 10-27 kg +/- 0.000 000 074 x 10-27 kg
Mass of neutron: 1,6749 x 10^(-27) kg
Mass of electron: 0,00091x10^(-27) kg
To put that another way,
A Neutron weighs 1.
A Proton weighs 0.99862349.
Electrons weigh 0.00054386734 each.
Still another way to say that...
To put that another way, centripetal force is generated whenever an object in motion is acted upon by a force that changes its direction. It is the friction that creates the centripetal force, by changing the direction of motion. It is turning the steering wheel that creates the friction, as...
Plastic gets worn and metals may react. Glass is smooth so retains (wastes) little of the chemicals, is easily cleaned, is durable, is brittle so will not bend and is very obvious when it's no good anymore.
And then there is that splish splash song from the 50's that I just planted in your...
"When you look at words in a mirror, how come they're reversed left to right but not top to bottom? What's special about the horizontal axis?"
If you take the mirror down from the wall and lay it on the floor. Then place the word on the floor next to the mirror, standing upright. Then sit on...