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Slows the motion between two objects in contact with each other?
friction
Is it true Gravity slows the motion between two objects in contact with each other?
No.
Difference between aggregation and composition?
Aggregation is a collection of objects where they are loosely associated with each other. Composition is when there is a tighter restriction between two, or more, objects where the composed object cannot exist without the other object, or objects.
Why does the acceleration of an object rolled down an incline increase as the angle of incline increases?
The contribution of the acceleration of gravity in the direction of motion increases as the angle of the incline increases. Or in other words, as the angle between the direction of motion and the force of gravity goes to zero, the acceleration of the object goes to the gravitational acceleration. a = g cos(theta) Where theta is the angle between the direction of motion and verticle, which is in fact (theta = 90 - angle of the incline)Where a is the acceleration of the object down the incline plane and g is the acceleration due to gravity. Theta is the angle between the direction of motion of the accelerating object and the acceleration of gravity. Initially, the angle between a and g is 90 degrees (no incline) and therefore g contributes nothing to the objects acceleration. a = g cos(90) = 0 As the angle of the inclined is increased, the angle between a and g approaches zero, at which point a = g. With no other forces acting upon the object, g is its maximum acceleration.
What problems could occur if some scientists measured objects by using SI units and other scientists measured objects by using other units?
No problems provided they state which units. Most scientists are capable of converting between units.
