Question

which of the following is an example of a non - contact force?
friction
normal force
applied force
gravity
question 2
what is a normal force?
it acts with an object adding to its speed.
it acts perpendicular to an object.
it acts parallel to an object.
it acts against an object slowing it down.
question 3
what type of force is it when an object is pushed or pulled by another object?
gravity
applied force
friction
normal

Explanation:

• Question 1: Friction, normal force, and applied force are contact forces (they act when objects are in physical contact). Gravity is a non - contact force (it acts at a distance, e.g., the Earth's gravity acts on objects without direct physical contact in the sense of touching).
• Question 2: The normal force acts perpendicular to the surface of an object. For example, when a book is on a table, the table exerts a normal force on the book perpendicular to the table's surface.
• Question 3: When an object is pushed or pulled by another object, it is an applied force. Gravity acts at a distance, friction opposes relative motion (and is a contact force), and normal force is perpendicular to a surface.

Answer:

• Question 1: Gravity
• Question 2: It acts perpendicular to an object
• Question 3: Applied force