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Newton’s 2 nd Law of Motion

Newton’s 2 nd Law of Motion. F = ma . Newton’s 2 nd Law. An object acted on by an unbalanced force will accelerate in the direction of the force. . Force = mass x acceleration. N = kg x m/s 2. Weight - force of gravity on an object. WEIGHT Changes w / gravity. MASS Stays the SAME.

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Newton’s 2 nd Law of Motion

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  1. Newton’s 2nd Law of Motion F = ma

  2. Newton’s 2nd Law • An object acted on by an unbalanced force will accelerate in the direction of the force.

  3. Force = mass x acceleration N = kg x m/s2

  4. Weight- force of gravity on an object WEIGHT Changes w/ gravity MASS Stays the SAME

  5. How does distance & mass affect gravity? More Mass = More Gravity More Distance = Less Gravity • There is less gravity acting on you if you were in plane as opposed to standing on ground b/c you are farther from Earth’s gravitational pull

  6. How fast do objects fall to Earth? • Acceleration on Earth due to gravity is ALWAYS 9.8m/s2 • Acceleration Demo

  7. 3rd Law of Motion Action Reaction

  8. 3rd Law- for every action, there is an equal but opposite reaction EXAMPLES • Fish pushes back on water w/ fins & water propels fish forward • Wings of bird pushes down, air pushes up • Kick back on concrete, skateboard moves forward

  9. A balloon & rocket are similar because as the air or gas pushes down the balloon or rocket goes up

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