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# Chapter10

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### Chapter10

1. 1. Chapter 10 Forces
2. 2. Section 1 <ul><li>Force- a push or a pull. Described by its magnitude and direction. </li></ul><ul><li>Newton- (N) the SI unit for the magnitude of a force. Also called weight. </li></ul>
3. 3. • Net Force- The combination of all forces. Determines whether an object moves and in which direction. • Unbalanced Forces- can cause the velocity of an object to change. • Balanced Forces- equal forces acting on one object in opposite directions. Balanced forces acting on an object do not change the object’s velocity.
4. 4. Section 2 <ul><li>Friction- a force that acts in a direction opposite to the motion of objects. The strength of friction depends on the type of surface. Without friction, a moving object would not stop without hitting another object. </li></ul>
5. 5. <ul><li>Static Friction- friction that acts on objects that are not moving. Ex. </li></ul><ul><li>Sliding Friction- occurs when two solid objects slide over each other. Ex. </li></ul><ul><li>Rolling Friction- when an object rolls across a surface. Ex. </li></ul><ul><li>Fluid Friction- when a solid object moves through a fluid. Ex. </li></ul>
6. 6. <ul><li>Gravity- a force that pulls objects toward each other. </li></ul><ul><li>Mass- the amount of matter in an object. </li></ul><ul><li>Weight- the gravitational force exerted on a person or object at the surface of a planet. </li></ul><ul><li>Weight= Mass x acceleration due to gravity </li></ul><ul><li>Acceleration due to gravity= 9.8 m/s 2 </li></ul>
7. 7. <ul><li>Free Fall- when the only force acting on an object is gravity. </li></ul><ul><li>Air Resistance- a type of fluid fiction. </li></ul><ul><li>Projectile- an object hat is thrown. </li></ul><ul><li>Elastic forces- </li></ul><ul><ul><li>Compression: a force that squeezes or pushes matter together. </li></ul></ul><ul><ul><li>Tension: a force that stretches or pulls matter. </li></ul></ul>
8. 8. Section 3 <ul><li>Newton’s 1st law of motion- an object will remain at rest or moving unless it is acted upon by an unbalanced force. </li></ul><ul><li>Inertia- resistance to a change in motion. </li></ul>
9. 9. • Newton’s Second Law of Motion- acceleration depends on the the net force of the object and its mass. Acceleration = Net force Mass OR Net force= Mass x acceleration
10. 10. Section 4 <ul><li>Newton’s Third Law of Motion- for every action there is an equal and opposite reaction. </li></ul><ul><li>Momentum- a moving object has both mass and velocity. </li></ul><ul><li>Momentum=mass x velocity </li></ul><ul><li>Law of conservation of momentum- momentum is transferred from one object to another. </li></ul>