Forces are pushes or pulls acting on an object. They can cause an object to move, change direction, or deform. In physics, forces are described by their magnitude and direction.

- 1. Contact forces: These are forces that act at the point of contact between two objects, such as friction, normal force, tension, and applied force.
- 2. Action-at-a-distance forces: These are forces that can act on an object without direct contact, like gravitational force and electrostatic force.

- 1. Newton's First Law (Law of Inertia): An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
- 2. Newton's Second Law: The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F = ma).
- 3. Newton's Third Law: For every action, there is an equal and opposite reaction.

A free body diagram is a diagram used to represent the forces acting on a single object. It helps in analyzing the forces and their effects on the object's motion.

- Define force and its effects on an object.
- Differentiate between contact forces and action-at-a-distance forces, providing examples of each.
- Explain Newton's First Law of Motion with relevant examples.
- State and apply Newton's Second Law of Motion using the equation F = ma.
- Discuss Newton's Third Law of Motion and provide examples to illustrate it.
- Create and interpret free body diagrams for objects experiencing various forces.

Worksheet/Answer key

Forces - Set I Worksheet/Answer key

Forces - Set I Worksheet/Answer key

Forces - Set I Worksheet/Answer keyForces - Set I

PHYSICS

Motion and Stability: Forces and Interactions

Identify and analyze forces responsible for changes in rotational motion and develop an understanding of the effect of rotational inertia on the motion of a rotating object (e.g., merry-go-round, spinning toy, spinning figure skater, stellar collapse [supernova], rapidly spinning pulsar).