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Force

Force. Force. The push or pull on an object. Gravity. Force or attraction between two objects. Weight. Measure of the force of attraction between an object and Earth. A newton is the metric unit used to measure weight. Many forces act together on an object.

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Force

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  1. Force

  2. Force The push or pull on an object.

  3. Gravity Force or attraction between two objects.

  4. Weight Measure of the force of attraction between an object and Earth. A newton is the metric unit used to measure weight.

  5. Many forces act together on an object.

  6. However, it is not always easy to determine what is exerting a force or what is receiving a force.

  7. When forces are applied in the same direction, the forces are added together. Example: paddling a boat in the same direction helps the boat to go faster.

  8. 25 n + 45 n 20 n =

  9. When forces are applied in opposite directions, subtract the smaller force to determine the direction. Example: tug-a-war

  10. 13 n 10 n 13 n 10 n 3 n = -

  11. Motion

  12. Isaac Newton proposed three laws of motion. His laws combined the findings of other scientists with his own observations.

  13. Isaac Newton is best known for stating that gravity exists throughout the universe.

  14. Motion Process of moving from one place to another.

  15. 3 Types of motion

  16. Straight line • example: walking forward

  17. Circular paths • example: airplane ride at amusement park

  18. Vibrations • example: string instruments

  19. Relative Motion Change in position of one object compared to the position of another object.

  20. Does the sun move or the Earth?

  21. Speed Rate at which the position of an object changes.

  22. Two units of measure are required to indicate speed. • Any unit of timeEx: seconds, minutes, hour • Any unit of distanceEx: centimeters, meters

  23. Velocity Includes both a speed and a direction.

  24. Speed of a car: 65 miles/hour Velocity of a car: 65 miles/hr to the west

  25. Acceleration Tells the rate at which velocity is changing, and includes a direction.

  26. Acceleration occurs when a moving object speeds up, slows down, or changes direction.

  27. Any change in velocity is acceleration. Slowing down is negative acceleration.

  28. A car goes from 0 miles/hr to 60 miles/hr in 10 seconds, the average acceleration is 6 miles/hr/second.

  29. Friction Force between surfaces that resists the movement of one surface past another surface.

  30. Friction also exists between an object rolling across another surface.

  31. Newton’s First Law of Motion An object at rest tends to stay at rest and an object in motion tends to stay in motion at the same speed and in the same direction unless acted upon by an unbalanced force.

  32. Newton’s Second Law of Motion Moving objects move in the direction the force is applied. Push movement

  33. Newton’s Third Law of Motion For every action there is an equal & opposite reaction. Push Reaction

  34. Inertia The tendency for all objects to resist any change in motion.

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