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Acceleration

Acceleration. Acceleration. A change in velocity over a change in time This can be: speeding up, slowing down, or changing directions. Acceleration Due to Gravity. If air resistance is zero, all objects accelerate downwards at 9.81 m/s 2 [down] g = 9.81 m/s 2 [down ]

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Acceleration

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  1. Acceleration

  2. Acceleration • A change in velocity over a change in time • This can be: speeding up, slowing down, or changing directions

  3. Acceleration Due to Gravity • If air resistance is zero, all objects accelerate downwards at 9.81 m/s2 [down] • g = 9.81 m/s2 [down] • If an object accelerates downwards at this rate, we say it is in free fall • Ex. Drop zone at Canada’s Wonderland

  4. What does acceleration mean mathematically? • Example 1: • Velocity is 5.0 m/s [fwd], acceleration is 1.0 m/s2 [fwd] • Os: 5.0 m/s [fwd] • 1s: 6.0 m/s [fwd] • 2s: 7.0m/s [fwd] • 3s: 8.0m/s [fwd] • 4s: 9.0 m/s [fwd] • Moving forward, speeding up

  5. Example 2: • Velocity is 5.0 m/s [fwd], acceleration is 1.0 m/s2 [backwards] • Os: 5.0 m/s [fwd] • 1s: 4.0 m/s [fwd] • 2s: 3.0m/s [fwd] • 3s: 2.0m/s [fwd] • 4s: 1.0 m/s [fwd] • Moving forward, slowing down

  6. What does acceleration mean mathematically? • Example 3: • Velocity is 5.0 m/s [bkwd], acceleration is 1.0 m/s2 [fwd] • Os: 5.0 m/s [bkwd] • 1s: 4.0 m/s [bkwd] • 2s: 3.0m/s [bkwd] • 3s: 2.0m/s [bkwd] • 4s: 1.0 m/s [bkwd] • Moving backwards, slowing down

  7. Example 4: • Velocity is 5.0 m/s [bkwd], acceleration is 1.0 m/s2 [bkwd] • Os: 5.0 m/s [bkwd] • 1s: 6.0 m/s [bkwd] • 2s: 7.0m/s [bkwd] • 3s: 8.0m/s [bkwd] • 4s: 9.0 m/s [bkwd] • Moving backwards, speeding up

  8. Example: • Felix Baumgartner is at rest as he jumps from space. If he is falling for 259s (4 min, 19s), what speed will he reach? Assume there is no air resistance. • Ans: 2.54 x 103 m/s

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