101 حقيقة في الفيزياء

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Mechanics

1- Weight (force of gravity) decreases as you move away from the earth by distance squared.
2- Mass and inertia are the same thing.
3- Constant velocity and zero velocity means the net force is zero and acceleration is zero.
4- Weight (in newtons) is mass x acceleration (w = mg). Mass is not weight!
5- Velocity, displacement [s], momentum, force and acceleration are vectors.
6- Speed, distance [d], time, and energy (joules) are scalar quantities.
7- The slope of the velocity-time graph is acceleration.
8- At zero (0) degrees two vectors have a resultant equal to their sum. At 180 degrees two vectors have a resultant equal to their difference. From the difference to the sum is the total range of possible resultants.
9- Centripetal force and centripetal acceleration vectors are toward the center of the circle- while the velocity vector is tangent to the circle.
10- An unbalanced force (object not in equilibrium) must produce acceleration.
11- The slope of the distance-tine graph is velocity.
12- The equilibrant force is equal in magnitude but opposite in direction to the resultant vector.
13- Momentum is conserved in all collision systems.
14- Magnitude is a term use to state how large a vector quantity is.

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الموضوع الأصلي: 101 حقيقة في الفيزياء || الكاتب: عـــــذاري || المصدر: اسم منتداك

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