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Forces and Motion

Forces and Motion. Ch 2 Sect 3. Forces. Force-a force is a push or pull that one body exerts on another A force can cause the motion of an object to change Example-Swinging a racket Force is measured in the SI unit called newtons. Types of Forces. There are 3 types of forces

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Forces and Motion

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  1. Forces and Motion Ch 2 Sect 3

  2. Forces • Force-a force is a push or pull that one body exerts on another • A force can cause the motion of an object to change • Example-Swinging a racket • Force is measured in the SI unit called newtons

  3. Types of Forces • There are 3 types of forces 1. Balanced Force-Forces on an object are equal and opposite in direction 10 Newtons 10 Newtons

  4. Types of Forces (cont) • Unbalanced force-Forces are pushing against each other with unequal force Unequal forces lead to motion of an object Motion 10 Newtons 5 Newtons

  5. Types of Forces (cont) 3. Net force- net forces are the sum or accumulation of all forces on the object • Add up all the forces on the object to find the net force • Net force occurs in the direction of the larger force

  6. Inertia • Inertia is the tendency of an object to resist change in its motion • Mass and weight are related to inertia • The greater the mass the greater the inertia

  7. Law of Inertia • Law of inertia is Newton's 1st law of motion • An object moving at a constant velocity keeps moving at that velocity until a force acts upon it. An object at rest stays at rest until a net force acts upon it

  8. Law of Inertia Simplified • Something that is moving, will keep moving until it is stopped • Something that is sitting still will keep sitting still until you push/pull/hit it

  9. Questions Relating to Inertia • When you throw a ball up as hard as you can why doesn’t it keep going? • How does a human not wearing a seatbelt demonstrate the law of inertia in a car crash?

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