Physics question! NO silly answeres plzz.. It involves a ball being rolled down a slope.?

Question

Ok! What happens when the slope (by with the ball rolls down, in my case it was a wooden plank) has been tilted over 45 degrees in angle. and the ball is put at the top of the slope and released to roll down? (remember the slope is over 45 degrs) and as u tilt the board/slope the ball starts simply starts rolling down the board, but actually with out any force acting on it. You know what i mean? ofcourse until the point of 'free fall' where the ball simply drops down with total gravity acting on it. but when its u know on a slope of say ..... 55 degrees or 70 degrees. what is actually happening? what do u call that?

Answer 1

I call that magic.

No, really, the force of gavity is acting on the ball even while it's on that slope. w = W sin(theta) = the amount of force of gravity (weight) acting to pull the ball down along the surface of slope. Theta is the angle of incline (e.g., 45 deg).

Thus, at theta = 0 deg, there is no slope, there is no force acting along the surface of the wooden plank. The ball will just sit there because w = W sin(theta) = W sin(0) = W*0 = 0 force (weight) acting along the surface of the wooden plank.

At theta = 90 deg, the plank is perpendicular to the floor, all the force is acting along the surface of the wood. This results from w = W sin(90) = W*1 = W; all of W is acting along the surface (the ball is now in free fall).

Lesson learned: All objects have weight (W) if they are subjected to gravity. That weight is the force of gravity. And any force can cause acceleration through f = ma. But the percentage of that weight (w/W = sin(theta)) to move the objects along the surface they rest on depends on the angle (theta) of the surface relative to the horizontal.

Answer 2

Thats called the ball rolling down the slope under the influence of the earth's gravitational field. What else could it be?

Answer 3

a million. The centre of gravitation is going down sped up. 2. Ball rotates sped up. 3. Gravity skill is transferred into kinetic skill of translation and into kinetic skill of rotation. 4. The halfpipe bends below the load of the ball. (perhaps it quite is invisible). Its sort is elastically replaced. 5. extremely some the situations you could hear a rolling sound. So additionally sound skill (kinetic skill of the air) comes out.

Answer 4

if you already know about gravity, then why even ask this question????