welcome! the topic for today is…. newton’s 2 nd & 3 rd laws test review cannons &...
TRANSCRIPT
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: 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: 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: 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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