ข้อ 23 (Physics - งานและพลังงาน)

 

The slope of the distance-tine graph is velocity.

The equilibrant force is equal in magnitude but opposite in direction to the resultant vector.

Momentum is conserved in all collision systems.

Magnitude is a term use to state how large a vector quantity is.

ข้อ 22 (Physics - งานและพลังงาน)

 

Speed, distance [d], time, and energy (joules) are scalar quantities.

The slope of the velocity-time graph is acceleration.

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.

Centripetal force and centripetal acceleration vectors are toward the center of the circle- while the velocity vector is tangent to the circle.

An unbalanced force (object not in equilibrium) must produce acceleration.

ข้อ 21 (Physics - งานและพลังงาน)

Mechanics

Weight (force of gravity) decreases as you move away from the earth by distance squared.

Mass and inertia are the same thing.

Constant velocity and zero velocity means the net force is zero and acceleration is zero.

Weight (in newtons) is mass x acceleration (w = mg). Mass is not Weight!

Velocity, displacement [s], momentum, force and acceleration are vectors.