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Chapter Fourteen: Force and Motion

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1 Chapter Fourteen: Force and Motion
Notes: Newton’s Second Law p

2 Newton’s first Law Objects keep the same motion unless the forces become unbalanced.

3 Newton’s Second Law Force causes acceleration
Mass resists acceleration.

4 Review What is force? A push or pull

5 Review What is mass? The amount of matter (atoms) in an object
What has more mass?

6 Review What is mass? The amount of matter (atoms) in an object
What has more mass?

7 Review What has more mass?

8 Review What has more mass? Don’t forget density!

9 What is acceleration? Acceleration is the rate (how fast or slow) at which your velocity (speed with direction) changes.

10 Who has the faster acceleration?
A B

11 What causes acceleration?
A car can change its acceleration by speeding up slowing down turning (changing direction)

12 Newton’s Second Law Equation
F= ma Force= mass x acceleration

13 What happens when the force increases?
The stronger the force on an object, the greater its acceleration.

14 What happens if the mass is increased?

15 What happens if the mass is increased?
There must be more force to keep the same acceleration 50 N 300 N

16 What happens if the mass is increased?
There must be more force to keep the same acceleration 50 N 300 N

17 14.2 Applying the second law
What force does a box with a mass of 10kg need to have an acceleration of 3 m/s/s?

18 14.2 Applying the second law
What force does a box with a mass of 10kg need to have an acceleration of 3 m/s/s? F=ma

19 14.2 Applying the second law
What force does a box with a mass of 10kg need to have an acceleration of 3 m/s/s? F=ma F=10x3

20 14.2 Applying the second law
What force does a box with a mass of 10kg need to have an acceleration of 3 m/s/s? F=ma F=10x3 F= 30N

21 14.2 Applying the second law
A box with a mass of 2 kg needs a force of 4N to achieve an acceleration of 2 m/s/s. If you have a heavier box with a mass of 10 kg, how much force will you need for the same acceleration?

22 14.2 Applying the second law
A box with a mass of 2 kg needs a force of 4N to achieve an acceleration of 2 m/s/s. If you have a heavier box with a mass of 10 kg, how much force will you need for the same acceleration? F=ma

23 14.2 Applying the second law
A box with a mass of 2 kg needs a force of 4N to achieve an acceleration of 2 m/s/s. If you have a heavier box with a mass of 10 kg, how much force will you need for the same acceleration? F=ma F=10x2

24 14.2 Applying the second law
A box with a mass of 2 kg needs a force of 4N to achieve an acceleration of 2 m/s/s. If you have a heavier box with a mass of 10 kg, how much force will you need for the same acceleration? F=ma F=10x2 F=20 N

25 Investigation 14B Newton’s Second Law
What is the relationship between force and motion?

26 Explain how these rides work using Newton’s 1st (balanced forces) and 2nd law of motion
Centripetal force occurs when something is moving in a circle

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