Question

1 force and motion (continued)
describe write a few short sentences answering each question.
what is force? a push or pull.
what are two types of forces? the two types of forces is contact force and non - contact forces
how do you represent forces?
get it? explain how contact forces are different from field forces.
describe what a system is, and draw an example of one in the box below. draw a circle around your system, and label the system and the external world.

Explanation:

• What is force? A force is a push or pull that can cause an object to start moving, stop moving, or change its motion. It is a vector quantity, meaning it has both magnitude and direction.
• What are two types of forces? The two main types of forces are contact forces (e.g., friction, normal force, tension) and non - contact forces (e.g., gravitational force, electromagnetic force). Contact forces require physical contact between objects, while non - contact forces act at a distance.
• How do you represent forces? Forces are represented by vectors. A vector has an arrowhead that indicates the direction of the force and a length that is proportional to the magnitude of the force. Forces can also be represented using force diagrams (free - body diagrams) where all the forces acting on an object are shown.
• Get It? Explain how contact forces are different from field forces. Contact forces require physical contact between two objects for the force to be exerted (e.g., when you push a book, your hand is in contact with the book). Field forces (non - contact forces) act at a distance without any physical contact. For example, the gravitational force between the Earth and the Moon acts without them touching each other.
• Describe what a system is, and draw an example of one in the box below. Draw a circle around your system, and label the system and the external world. A system is a set of objects or components that we choose to study. For example, if we consider a book on a table as the system, the external world would include the Earth (providing the gravitational force), the table (providing the normal force), and the air (providing air resistance if the book is moved). In a diagram, we would draw a circle around the book (the system) and label the forces from the external world (like a downward arrow for gravity labeled "Earth's gravity" and an upward arrow for the normal force labeled "Table's normal force").

Answer:

• What is force? A push or pull (with more detailed explanation as above).
• What are two types of forces? Contact forces and non - contact forces (with more detailed explanation as above).
• How do you represent forces? Using vectors (with more detailed explanation as above).
• Get It? Contact forces need physical contact; field forces act at a distance (with more detailed explanation as above).
• Describe what a system is... A set of objects/components (with example and diagram description as above).