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Transcript
Motion: Forces and Cases of Motion Name______________ assign#_____ 2. 3. 1. . A _______ or ____________ that one body ______________ on another. FORCE Forces can be: ______________________________ Which means ________ acceleration and _______ change of motion. 5. Forces can be: ______________________________ Which means that there is a ____________ force. The object will either ____________ up, __________ down or __________________ direction. 6. Which way will the object move? ____________________ 7. 8. 10. The unit of FORCE is the ______________. Newton’s 1st Law of Motion. Objects keep on doing what ____________ _______. An object at _____________ stays at rest, and an object in motion stays in __________ unless acted upon by a __________ external force. Also called the Law of ___________ 11. 1N= ________ of the forces Tendency of an object to _____________ any ____________ in its motion The acceleration of an object is __________________ proportional to the net external ___________ acting on the object and _______________proportional to the object’s __________________. 14. Newton’s 2nd Law of Motion. 17. Newton’s 2nd Law Example Problem: What force is needed to give an object with a mass of 25.0 kg an acceleration of 15.0 m/s2 ? 18. Forces that oppose motion 19. _____________is a force that opposes motion between _______ __________ that are touching each other. _____________ resistance is the force air exerts on a moving object. 20. Caused by Microscopic, electrostatic interactions between __________ _________ FRICTION 3 2 1 21. & 23 force required to overcome inertia of a_________________ object force required to keep an object ___________ at a constant speed force required to keep an object ______________at a constant speed 24. The amount of force required to overcome ___________________ friction is always greater than the force required to overcome _______________ or ____________ friction. Motion: Forces and Cases of Motion Name______________ assign#_____ 2. . A _______ or ____________ that one body ______________ on another. is an ___________ force 25. GRAVITY the amount of which depends on *All objects ____________toward the earth at the __________ ___________ of acceleration, regardless of their masses 27. From the video Clip: Who explained gravity? ______________________________________ Gravitation is a ______________ ______________. What are two examples? ____________________________________ Why doesn’t the moon fall to Earth?___________________________ _______________________________________________________ 29. Freefall and Terminal Velocity: Objects accelerate towards the ______________until the force of gravity is cancelled or ______________ by this air resistance. This is the ________________ ____________________ an object can reach. 30. WEIGHT Force of _________ on an object Formula: 33. Work the example problem: What is your weight if your mass 4.52 kilograms? Measured in ____________ 34. Newton’s 3rd Law of Motion. …to every __________ force there is an __________ and opposite reaction force Examples: 37 Projectile Motion Projectiles follow a __________ path because of the ___________ ___________ pull. ________________ Motion ________________ Motion 38. Which will hit the ground first? A ball that is dropped straight down or a ball that is “shot” out horizontally? _____________________________________________ 41 Circular Motion: Centripetal force is the force that causes a moving object to move in a __________________ ____________________. 43. From the video: What forces are involved in roller coasters? (name 3) _____________________ _____________________________________________________________ What happens at 6 g-force? ________________________________________ _____________________________________________________________ At what g-force is the roller coaster running? __________________________ _____________________________________________________________