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Motion and Forces

Motion and Forces. Chapter 2. Bell Work 1/21/10. Copy each of these statements onto your bell work sheet. Then decide if they are true or false. If false correct them. Speed includes direction, while velocity does not.

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Motion and Forces

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  1. Motion and Forces Chapter 2

  2. Bell Work 1/21/10 Copy each of these statements onto your bell work sheet. Then decide if they are true or false. If false correct them. • Speed includes direction, while velocity does not. • A moving object covers the same distance in less time if its velocity is greater. • Acceleration measures only change in speed.

  3. Bell Work 1/22/10 Please begin working on your foldable or PowerPoint On your bell work sheet write down “working on project” for today

  4. Bell Work 1/25/10 Please begin completing the Map Practice Packet. Write your answers for each question on your yellow bell work sheet for today. PLEASE DO NOT WRITE IN THE PACKET

  5. Force 2.1 Notes • forces occur when one object pushes or pulls on another object • We say that one object exerts a force on another object to cause it to accelerate.

  6. Describing Forces • forces are describe according to: • strength and • direction

  7. Two types of Forces • Unbalanced Force • two forces acting in the same direction • OR • One stronger force acting in the opposite direction of a weaker force. *Unbalanced forces cause an object to accelerate!

  8. Balanced Force • equal forces acting in opposite directions * balanced forces will NOT change the object’s motion!

  9. Newton’s First Law • An object at rest will remain at rest unless acted upon by an unbalanced force!

  10. continued • An object moving at constant velocity will continue moving at constant velocity unless acted upon by an unbalanced force.

  11. Newton’s first law is often referred to as the Law of Inertia. Inertia is a property that describes an object’s resistance to changes in motion. if an object is moving, inertia keeps it moving. if an object is at rest, inertia keeps it at rest. Mass – is the amount of matter in an object. Mass is a measure of inertia. the more mass an object has the more inertia it has. This means it will take more force to get it to accelerate. the opposite is also true: less mass, less inertia, less force. mass is measured in kg. Law of Inertia

  12. How are mass and inertia related? • The more matter in an object, the harder it is to get the object to accelerate or you could say the harder it is to overcome the object’s inertia.

  13. Force 2.2 Notes • Newton’s Second Law of Motion • Explains a relationship between force, mass and acceleration • Often expressed as: force = mass x acceleration • Simply stated: An object’s acceleration depends on the mass of an object and the strength and direction of the force acting on it.

  14. Force = mass x acceleration • Units: • acceleration – m/s/s • mass – kg • force – kg x m/s/s or Newton (N)

  15. To calculate mass: Mass = ___force___ acceleration To calculate acceleration: Acceleration = force mass Rearranging the Force Equation

  16. We know the following: as force increases, acceleration increases. as mass increases, acceleration decreases. to get an object to accelerate, you must increase force or decrease mass. Using the formulaacceleration = force/mass

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