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Section 2.2 Force and mass determine acceleration.

Section 2.2 Force and mass determine acceleration. Vocabulary. ___________________________ states that the acceleration of an object increases with increased force and decreases with increased mass. Newton’s Second Law.

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Section 2.2 Force and mass determine acceleration.

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  1. Section 2.2 Force and mass determine acceleration.

  2. Vocabulary • ___________________________ states that the acceleration of an object increases with increased force and decreases with increased mass. Newton’s Second Law

  3. Which shopping cart will have more acceleration if the same force is applied to both carts? So… Increasing Mass Decreases Acceleration! small mass same size force large mass same size force greater acceleration smaller acceleration

  4. Which shopping cart will have more acceleration? So… Increasing Force Increases Acceleration! same mass same mass greater force smaller force greater acceleration smaller acceleration

  5. An apple and a bowling ball are pushed with the same force. Which one will accelerate more? Why? The apple will accelerate more because it has less mass.

  6. Calculating Force F = ma F = force m = mass a = acceleration

  7. Calculating Force Class Example • What force is needed to accelerate a 10 kg shopping cart 3 m/s2? F = m x a F = 10 kg x 3 m/s2 F = 30 N

  8. Calculating ForcePractice Problem #1 • If a 5 kg ball is accelerating 1.2 m/s2, what is the force on it? F = 5 kg x 1.2 m/s2 F = 6 N

  9. Calculating ForcePractice Problem #2 • A person on a scooter is accelerating 2 m/s2. If the person has a mass of 50 kg, how much force is acting on that person? F = 50 kg x 2 m/s2 F = 100 N

  10. Skip questions # 9-14

  11. Thinking Question • How can an object accelerate when it does not change speed? It can simply change direction!

  12. True or False? • _____ A force can make an object change direction. • _____ If an object only changes direction then it is not accelerating. • _____ An object moves in the direction the force is applied. • _____ Forces can cause acceleration. True False True True

  13. Vocabulary Any force that keeps an object moving in a circle is known as _____________ force. centripetal

  14. Where does the force point towards? If you let go of the string, the ball would fly off in the direction it was headed when you let go. This is called the path of inertia.

  15. What do the blue arrows represent? centripetal force What do the black arrows represent? The path of inertia

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