Question

give two characteristics of action at a distance forces ​

Answer 1

Answer:

Newton’s Third Law of Motion describes the characteristics of a pair of action/reaction forces:

1. The two forces are equal in magnitude.

2. The two forces push or pull in opposite directions.

3. The two force act on different object.

The force of one object is acting on a second object and vise-versa.

4. The description of one force is the reverse of the second force’s description.

Example:

A book is placed on a table.

The book pushes down on the table with a force (Fb).

The table pushes up on the book with an equal force (Ft).

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Answer 2

Contact versus Action-at-a-Distance Forces

For simplicity sake, all forces (interactions) between objects can be placed into two broad categories:

contact forces, and

forces resulting from action-at-a-distance

Explanation:

• Contact forces are those types of forces that result when the two interacting objects are perceived to be physically contacting each other. Examples of contact forces include frictional forces, tensional forces, normal forces, air resistance forces, and applied forces. These specific forces will be discussed in more detail later in Lesson 2 as well as in other lessons.

• Action-at-a-distance forces are those types of forces that result even when the two interacting objects are not in physical contact with each other, yet are able to exert a push or pull despite their physical separation. Examples of action-at-a-distance forces include gravitational forces. For example, the sun and planets exert a gravitational pull on each other despite their large spatial separation. Even when your feet leave the earth and you are no longer in physical contact with the earth, there is a gravitational pull between you and the Earth. Electric forces are action-at-a-distance forces. For example, the protons in the nucleus of an atom and the electrons outside the nucleus experience an electrical pull towards each other despite their small spatial separation. And magnetic forces are action-at-a-distance forces. For example, two magnets can exert a magnetic pull on each other even when separated by a distance of a few centimeters. These specific forces will be discussed in more detail later in Lesson 2 as well as in other lessons.

Examples of contact and action-at-distance forces are listed in the table below.

• Contact Forces

Frictional Force

Tension Force

Normal Force

Air Resistance Force

Applied Force

• Action-at-a-Distance Forces

Gravitational Forces

Electrical Force

Magnetic forces.

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