Question

A aleatehes a ball al point B. In the given byure, Identity where in the
ball accelerating (Assume no gravity and he airdrag on the ball)
(A) Only at point B
(b) in path AB
() in paih Be
(D) in paih Ad

Answer 1

Answer:

Explanation:

I OFTEN LOOK at cases where things are falling. We typically call this "free fall" motion because the object is moving only under the influence of the gravitational force. With only the gravitational force, the object has a constant acceleration and the motion is fairly simple to model.

However, objects on the surface of the Earth usually have an air resistance force on them also. When can we ignore this extra force and when is it important?

Modeling Air Resistance ———————–

Let's say I drop a ping pong ball. As it falls, I can draw the following force diagram.

sketches_fall_14_key11

The most common model for the air resistance says that the magnitude of the force depends on:

The density of air (ρ). This typically has a value around 1.2 kg/m3.

The cross sectional area of the object (A). A ping pong ball would have a cross sectional area equal to π*r2.

The drag coefficient (C). This depends on the shape of the object.

Answer 2

Answer:

unite

Explanation: