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Acceleration

Acceleration. Definition? Equation: Units : To cause an acceleration on an object there must be . . . What do we know about  F in an object that is changing its velocity?. Rate of change in velocity. ∆ v / t. Meters/sec/sec or m/s 2. an outside force.  F is not zero.

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Acceleration

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  1. Acceleration • Definition? • Equation: • Units : • To cause an acceleration on an object there must be . . . • What do we know about  F in an object that is changing its velocity? Rate of change in velocity ∆v / t Meters/sec/sec or m/s2 an outside force  F is not zero

  2. Acceleration is always in the direction of . . . the net force This determines if the acceleration will be positive or negative.

  3. This car is traveling in the negative direction at 30 m/sec: Force from engine Friction What is the direction of the net force? Is the acceleration positive or negative? Is the object speeding up or slowing down?

  4. Car is traveling in the positive direction at 100 m/sec: Force from engine Friction What is the direction of the net force? Is the acceleration positive or negative? Is the object speeding up or slowing down?

  5. Truck is moving in the negative direction at 10 m/sec: Force from engine Friction What is the direction of the net force? Is the acceleration positive or negative? Is the object speeding up or slowing down?

  6. This truck is traveling in the positive direction at 50 m/sec: Force from engine Friction What is the direction of the net force? Is the acceleration positive or negative? Is the object speeding up or slowing down?

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