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Force and Newton’s Laws

This text provides an overview of fundamental concepts of forces and Newton's Laws of Motion. It defines a force as a push or pull and discusses net forces, balanced, and unbalanced forces. Newton's First Law states that an object remains at rest or continues in motion unless acted upon by an unbalanced force. The Second Law explains how force relates to mass and acceleration, while the Third Law emphasizes action-reaction pairs. Additionally, it examines friction and air resistance as forces that affect motion.

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Force and Newton’s Laws

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  1. Force and Newton’s Laws

  2. Forces • A force is a push or pull. Examples include pulling a wagon, throwing a ball, and opening a door. • A combination of forces acting on an object is the net force. • Balanced forces do not cause a change in the motion of an object. • Unbalanced forces do cause a change in an objects motion.

  3. What kind of forces?

  4. Newton’s First Law of Motion • An object at rest stays at rest unless an unbalanced force acts on it and causes it to move. • If the net force acting on an object is zero, the object remains at rest, or if the object is already moving, it continues to move in a straight line with constant speed.

  5. Example of the First Law

  6. Friction • Friction is the force that acts to resist sliding between two forces. This force can bring everything to a stop. • Types of friction include static friction, sliding friction, rolling friction, and fluid friction. • On your paper, write two examples of each.

  7. Newton’s Second Law of Motion • An object acted on by a force will accelerate in the direction of the force. • Acceleration= net force/mass • Force is measured in Newtons (N)

  8. Second Law

  9. Gravity • The force of gravity exists between any two objects that have mass. It is the attraction between any two objects. • Weight is the gravitational force on an object and is a measurement that depends on the mass of the object and the location.

  10. Examples of Gravity

  11. Using Newton’s Second Law • This shows how to calculate acceleration involved in speeding up, slowing down, and turning. • Acceleration= Force/Mass • Complete Applying Math on p. 481 in your notebook.

  12. Air Resistance • Air resistance is a form of friction that can slow down an object moving in the air. • Air resistance is a force that gets larger as the object speeds up. • It also depends on the shape of the object.

  13. Example

  14. Newton’s Third Law • Forces act in equal and opposite pairs in the Third Law. • For every action there is an equal and opposite reaction. • Write down 2 examples in your notebook.

  15. Third Law

  16. Weightlessness • This is the condition that occurs in free fall when the weight of an object seems to be zero.

  17. Example

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