Chapter Fourteen: Force and Motion

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Presentation transcript:

Chapter Fourteen: Force and Motion Notes: Newton’s Second Law p. 296-300

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

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

Review What is force? A push or pull

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

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

Review What has more mass?

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

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

Who has the faster acceleration? A B

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

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

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

What happens if the mass is increased?

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

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

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?

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

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

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

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?

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

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

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

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

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