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Forces and Motion
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Which of Newton's three laws explains why a gun recoils?
3rd
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
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.
How can someone reduce the amount of friction encountered by two objects surfaces?
Apply lubrication; e.g. lotion, butter, oil, grease, etc.
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
Momentum is a characteristic that is dependent upon _______ and ___________.
Mass and velocity.
Another name for Newton's First Law is the Law of ________________.
Inertia.
Anything thrown or shot through the air is considered a(n) ______________.
Projectile.
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
Why does a persons weight change when they visit the moon?
Because the gravitational field changes.
What force is applied to two people that each mass 150 kg a piece and are in free fall.
2,940 N
Which of Newton's Laws are represented in the following: A cat pounces on a ball and is knocked backwards.
3rd Law
An object will experience no motion when the net force calculated is _____________.
zero
An object that is in free fall reaches terminal velocity when __________________.
Gravity and air resistance equal each other.
List the four types of friction.
Fluid, rolling, static, and sliding.
The force that pulls objects towards the center of the Earth at 9.8 m/s/s.
Gravity


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