Newton's Laws of motion and gravitation????????????

Question

Can anyone tell me how to make or construct a working model on Newtons (any 1 of 3) law of motion or law of gravitation????

Answer 1

Yu can do this in many ways , u should study the demos of these laws given in school Physics texts. But what kind of model do u want to make , specifically? go thru the books and, u;ll click upon some idea.

Answer 2

His motion and gravity observations are unrelated from a physics POV. So you'd need two models...one for each law.

Motion (inertia,acceleration,force)

Inertia...tie a weight on the end of a very strong cord; then tie the cord very securely to the axle of an electric motor. Stand clear and turn the motor on giving plenty of room for the cord and weight to swing around in orbit. The fact that the weight works out at the end of a taut cord while orbiting the axle demo's the weight's tendency to move outward in a straight line if only the cord would let go and not force it to change direction (dv/dt > 0) But, because of the cord, there is centripetal force keeping the weight in orbit.

Acceleration...take a known mass m and drop it from a known height h. Time the fall t. From W = mg; where W is the measured weight (using a scale) of the mass, calculate g. And from h = 1/2 at^2 calculate a = 2h/t^2 to verify that a = g in which case W = mg = ma = F and F = ma, his second law is verified. [NB: make sure your mass is not affected by drag as it drops through the air.]

Force...hang a mass of weight W from a fish weighing scale. Note the weight indicated by the scale, which is based on Hooke's law F = kx; where x is the extension of the spring of coefficient k. Note that F = W; so that f = W - F = ma = 0 and a = 0 when the weight of the mass is offset by the pull of the fish scale. Thus the weight is not accelerating and there is equal and opposite force on the weight (coming from the fish scale spring).

Gravity...calculate the theoretical acceleration due to gravity g = GM/R^2; where G is Newt's gravitational constant, M is Earth's mass and R is the Earth's radius from center to surface where you stand. Now weigh a known mass m; so that W/m = g0; where W is the measured weight and g0 is the calculated acceleration due to gravity acting on the mass. See if g = g0; that is, see if the calculated g is close to the observed g0.

So there are a few possible experiments/models for motion and gravity.

Answer 3

One Law says that an object in motion will remain in motion until a force acts to change its motion.

Build one of those cool toys where 5 or six steel balls are suspended in a frame. This is called a Newtons Cradle. The gracefully swinging and colliding balls demonstrate Newtons Third Law of Motion: that for every action force there is an equal and opposite reaction force.

When you pick up one or two or three and let them fall, the energy will be transmitted in an equal amount through the other balls.

;-D It is fun and shows the conservation of momentum or energy or something... look it up!.