WELCOME!THE TOPIC FOR TODAY IS…

Newton’s 2nd & 3rd Laws Test ReviewCannons & Cannonballs

Net Force Action / Reaction

Yes/ No Math

200 200 200 200 200

400 400 400 400 400

600 600 600 600 600

800 800 800 800 800

1000 1000 1000 1000 1000

Final Jeopardy…what is your wager?

Topic 1: 200Question:Picture a cannon launching a cannonball.

The cannon pushes the cannon ball and the cannonball pushes the cannon. The cannon is much more massive than the cannonball; the cannon is resting on a frictionless surface. Which has the larger force, the cannonball or the

cannon? AnswerNeither – they experience the same force!Back

Topic 1: 400Question:Picture a cannon launching a cannonball.

The cannon pushes the cannon ball and the cannonball pushes the cannon. The cannon is much more massive than the cannonball; the cannon is resting on a frictionless surface. Which has the larger acceleration, the cannonball or

the cannon? AnswerCannonball (it has the smaller mass)Back

Topic 1: 600Question:Picture a cannon launching a cannonball.

The cannon pushes the cannon ball and the cannonball pushes the cannon. The cannon is much more massive than the cannonball; the cannon is resting on a frictionless surface. How would the directions in which they moved

compare (same direction / opposite directions?)

AnswerOpposite Back

Topic 1: 800Question:Picture a cannon launching a cannonball.

The cannon pushes the cannon ball and the cannonball pushes the cannon. The cannonball is EQUAL IN MASS to the cannon. The cannon is resting on a frictionless surface Which has the larger force, the cannonball or the

cannon? AnswerNeither – they experience the same force!Back

Topic 1: 1000Question:Picture a cannon launching a cannonball.

The cannon pushes the cannon ball and the cannonball pushes the cannon. The cannonball is EQUAL IN MASS to the cannon. The cannon is resting on a frictionless surface Which has the larger acceleration, the cannonball or the

cannon? AnswerNeither – they experience the same acceleration!

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Topic 2: 200Question:A 20-N force and a 40-N force act on an

object in the same direction. What is the net force on the object?

Answer60 N

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Topic 2: 400Question:A 20-N force and a 40-N force act on an

object in opposite directions. What is the net force on the object?

Answer20 N

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Topic 2: 600Question: A 15 kg object is rolling toward you at 1

m/s. Another 15 kg object is rolling toward you at 5 m/s. Which object has the greater inertia?

AnswerSame inertia

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Topic 2: 800Question: A 15 kg object is rolling toward you at

10 m/s. A 20 kg object is rolling toward you at 1 m/s. Which object has the greater inertia?

AnswerThe 20 kg object

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Topic 2: 1000Question:A car has a mass of 1000 kg and

accelerates at 2 m/s2. What is the magnitude of the net force acting on the car?

Answer2000 N

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Topic 3: 200Question:Forces occur in…____AnswerPairs

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Topic 3: 400Question:As a ball falls, the action force is the pull

of the earth's mass on the ball. What is the reaction to this force?

AnswerPull of ball’s mass on Earth

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Topic 3: 600Question:An unfortunate bug splatters against the

windshield of a moving car. Compared to the negative acceleration of the car, the negative acceleration of the bug is __________. (larger, smaller, the same, or zero)

AnswerLarger

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Topic 3: 800Question:An unfortunate bug splatters against the

windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is __________ (larger, smaller, the same or zero).

AnswerSame!

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Topic 3: 1000Question:A person is attracted towards the center

of the earth by a 500-N gravitational force. The force with which the earth is attracted toward the person is __________. (more than 500 N, less than 500 N, 500 N, or zero)

Answer500 N

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Topic 4: 200Question:

Can an action force exist WITHOUT a

reaction force?AnswerNo

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Topic 4: 400Question:If an object is at rest, is the net force on it 0 N?AnswerYes

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Topic 4: 600Question:Is it possible for a moving object to have

a net force of zero, but still have forces acting on it?

AnswerYes

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Topic 4: 800Question:An object is moving. It has a constant

velocity. Is it accelerating?AnswerNo

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Topic 4: 1000Question:An object is moving. It has a constant

velocity. Is the net force on it 0 N?AnswerYes

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Topic 5: 200Question:Calculate the NET FORCE on box A

Answer5 N

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Topic 5: 400Question:Calculate the acceleration on box A

Answer1 m/s2

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Topic 5: 600Question:Calculate the acceleration on box B

Answer½ or 0.5 m/s2

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Topic 5: 800Question:Calculate the acceleration on Box D

Answer½ or 0.5 m/s2

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Topic 5: 1000Question:A crate has a mass of 10kg. You

personally pull with a force of 10N, but the force of friction is 4N. What is the acceleration of the crate?

Answer0.6 m/s2

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Bonus Question: 5000 pts.Question:

A crate has a mass of 10kg. You personally pull with a force of 10N, but the force of friction is 4N. Suppose the crate is already moving at 1m/s how fast will it be moving after you have pulled it for 10 seconds? Answer

7 m/s

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