Gravity & Friction
First Law
Second Law
Third Law
Calculations
100
This is the difference between "weight" and "mass."
What is that weight depends on the force of gravity, but mass is the amount of matter in an object?
100
In one word, what does Newton's first law of motion describe?
What is "inertia?"
100
This is Newton's Second Law summarized in one word.
What is "acceleration"?
100
This is Newton's Third Law, in one word.
What is "reciprocal"?
100
This is the force it takes to accelerate an 80 kg object at 2.0 m/s2.
What is 160 N?
200
This is one way it is possible for the gravitational force between two 50-kg objects to be less that the gravitational force between two 5-kg objects.
What is that the larger objects are farther apart?
200
What event did Newton witness that led him to come up with his first law?
What is an apple falling from a tree?
200
This is the formula for Newton's Second Law.
What is Force = Mass x Acceleration?
200
This is the book definition of Newton's Third Law.
What is "when one object exerts a force on a second object, the second object exerts an equal force in the opposite direction on the first object."
200
This is the acceleration of a seventy kg object pushed with a force of 140 Newtons.
What is 2.0 m/s2?
300
This is Newton's Law of Universal Gravitation.
What is that all objects in the universe are attracted to one another to a certain degree, depending on their mass and the distance between them.
300
These are balanced forces.
What are forces that combine and form a net force that is zero?
300
These are the base units that are combined to make one "Newton."
What is a kilogram meter / second squared?
300
This is how Newton's Third Law of Motion applies to the motion of a bouncing ball.
What is that the ball exerts an action force on the ground and the ground exerts a reaction force on the ball that propels it into the air?
300
This is the force exerted by gravity on an 8 kg object.
What is 78.4 Newtons?
400
These are three examples of noncontact forces.
What are magnetism, electricity, and gravity?
400
This is Newton's First Law of Motion, as defined by your textbook.
What is "if the net force on an object is zero, the motion of the object does not change"?
400
If you triple the size of the force in a second law problem, but keep the mass the same, this happens to the size of the acceleration.
What is that it triples?
400
This is the law of conservation of momentum.
What is that the total momentum of a group of objects stays the same unless outside forces act on the objects?
400
A plane with 6 engines accelerates at 10 m/s2 with one engine running. This is how fast it accelerates with 3.5 engines running.
What is 35 m/s2?
500
What are the three types of friction stated in your text book, and what is an example of each?
What are fluid friction, sliding friction, and static friction?
500
This is the net force shown in the following diagram: 10N -----> <----------20N
What is 10N to the left?
500
This is the direction of the centripetal force.
What is perpendicular to the direction of motion, toward the center of the curve?
500
This is why force pairs do not cancel each other out.
What is that they act on different objects?
500
Mercury has 0.37 g's of gravity compared to Earth. This is the acceleration on Mercury due to gravity.
What is 3.626 m/s2?
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