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Q. 5

Expert-verified
Found in: Page 127

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

# You toss a ball straight up in the air. Immediately after you let go of it, what force or forces are acting on the ball? For each force you name, (a) state whether it is a contact force or a long-range force and (b) identify the agent of the force.

(a) The drag force is the contact force, while the weight is the long-range force.

(a) The ground is the agent of weight, while the air is the agent of drag force.

See the step by step solution

## Part (a) Step 1 : Given Information

Given : We toss a ball straight up in the air. Immediately after we let go of it

## Part (a) Step 2 : Simplification

(a) If we have an object that is subjected to forces, we must first identify the forces that are acting on it. The technique for recognizing forces will be depicted in visual form, as seen in the picture below.

The following steps are taken to determine the forces:

1. We recognize the object, which is a straight-up ball in the air.

2. We name and label the object's contact forces, which in this case are the drag forces

3. We give the long-range forces, which in this case are merely gravity, the abbreviation .

As a result, the drag force is the contact force, and the long-range force is the weight.

## Part (b) Step 1 : Given Information

Given : We toss a ball straight up in the air. Immediately after we let go of it

## Part (b) Step 2 : Simplification

(b) The force is exerted by the agent, which is the object. Because the weight is in a downward direction due to the earth's gravity, the earth is the agent in the weight. The drag force is upward and is exerted due to the air resistance. As a result, air is the drag force's agent.