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Unit 8: Forces
1) I can define force.
* Force- is a push or pull that one object exerts on another
2) I can draw a force diagram.
3) I can explain how force and motion are related.
* When you apply a large enough force to an object the object will move in the direction of that force.
4) I can describe Newton's First Law (inertia).
* Newton's First Law- an object at rest remains at rest and an object in motion remains in motion at a constant velocity, unless acted upon by an unbalanced force.
* Inertia- the tendency of an object change in its motion-depends entirely upon the mass of the object-greater the mass, the greater the inertia
5) I can describe the difference between balanced and unbalanced forces.
6) I can define Newton's Second Law of motion.
* Newton's Second Law- an unbalanced net force on an object causes that massed object to accelerate.
7) I can apply Newton's Second Law of motion.
8) I can describe three different types of friction.
9) I can describe gravitational force.
* Gravitational Force- is an attractive force that acts between any two masses. Equation: Fg=mass*9.8
10) I can differentiate between mass and weight.
* Mass- is a measure of the amount of matter. (the number of atoms that makes up an object) Mass is constant.
* Weight- is the gravitational pull on an object. Weight changes because it depends on the gravitational pull.
11) I can explain why objects thrown followed a curved path.
* The object travels in a curved path because gravity is pulling down on that object.
12) I can explain the effect of air resistance on falling objects.
* Air resistance- is the force that opposes the motion of an object through air (slows the object down)
13) I can define Newton's Third Law.
* Newton's Third Law- if a force is exerted on an object (action force), there is an equal but opposite force exerted by the object (reaction force)
* Both objects feel the same amount of force.
14) I can identify the action and reaction forces.
* Action Force- force exerted on an object
(example: basketball hitting a backboard)
* Reaction Force- force exerted back on that object
(backboard pushing back on the basketball)
15) I can define net force- the sum (add) of the forces that are acting on an object.
16) I can define friction- a force that opposes the sliding motion between objects that are in contact.
17) I can define free fall- state of motion when only gravity acts on an object.
18) I can define gravity- attractive force between 2 objects that depends on the masses of the objects and the distance between them (9.8m/s)
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