Presentation on theme: "Newton’s first law REVIEW"— Presentation transcript:
1 Newton’s first law REVIEW Summarize what the law states. What does an object at rest need for it to move? What is another name for newton’s first law of motion? What is inertia? What causes a moving object to stop moving? The (more/less) mass an object has, the harder it is to move.
3 NEWTON’S second lawThe acceleration of an object depends on the mass of the object and the amount of force applied. VOLUNTEERS!!!!! TWO “pushers” of similar size ONE small 8th grader ONE big 8th graderHave the “small” and “big” student sit in a chair. Have the “pushers” push them across the room. Discuss which required more energy and why.
4 Part 1: Acceleration depends on mass Acceleration of an object decreases as its mass increases Acceleration of an object increases as its mass decreasesWhich would be easier to push?WHY?
5 Part 2: Acceleration depends on force Acceleration of an object increases as the force on it increases Acceleration of an object decreases as the force on it decreasesVOLUNTEERS!!!!!ONE to sit in chairONE to push chair
6 Newton’s law with MATH mass Force acceleration Formula: F = m a Have students guess what the variables representUNITS acceleration: m/s² (meters per second squared)force: N (Newtons)mass: kg (kilograms)
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