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Study
Forces and Motion
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Anything thrown or shot through the air is considered a(n) ______________.
Projectile.
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An object will experience no motion when the net force calculated is _____________.
zero
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How can someone reduce the amount of friction encountered by two objects surfaces?
Apply lubrication; e.g. lotion, butter, oil, grease, etc.
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Which of Newton's Laws are represented in the following: A cat pounces on a ball and is knocked backwards.
3rd Law
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An object that is in free fall reaches terminal velocity when __________________.
Gravity and air resistance equal each other.
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Which of Newton's three laws explains why a gun recoils?
3rd
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Calculate the acceleration due to gravity on Pluto if a robot has a mass of 175kg and a weight of 950 N.
5.42 m/s/s
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Calculate the time it takes for an apple to fall from a tree if the initial velocity is 45 m/s before it hits the ground.
4.59 or 4.6 sec
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Which of Newton's Law states that the force applied to an object and the mass of the object determines the acceleration of the object?
2nd Law
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List the four types of friction.
Fluid, rolling, static, and sliding.
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Another name for Newton's First Law is the Law of ________________.
Inertia.
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The force that pulls objects towards the center of the Earth at 9.8 m/s/s.
Gravity
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Why does a persons weight change when they visit the moon?
Because the gravitational field changes.
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Momentum is a characteristic that is dependent upon _______ and ___________.
Mass and velocity.
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What force is applied to two people that each mass 150 kg a piece and are in free fall.
2,940 N
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What are some differences between a balanced and an unbalanced force?
A balanced produces no motion and the net force is zero. An unbalanced force produces motion and the net force is greater than zero.
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