External Force is the force that is not paired up and thus is the only one that can make the system suffer changes, or maybe not suffer changes if the dot product of the external forces sum to 0.
Gravitational Force MUST BE CHANGED to 2 resultant force at a frictionless slope,
ORIGINAL Gravitational Force MUST BE DELETED.
Why vectors and trigonometry can be apply to Forces, Acceleration, Velocity, Displacement?
They are all derived from Displacement, which is metres. (PERSONAL OPINION)
What keeps us standing?
Gravity and pushing force from ground which sums to 0.
What keeps water surface constantly parallel to xxx?
Gravity + pushing force from water molecules that sums to 0.
Why water going down a slope will become diagonal?
the pushing force of water molecules at the direction of motion becomes 0.
If an astronaut pushes the moon/an orange in space, will he feel pressure?
What is the cause that we feel our own weight?
We dont feel our own weight, we feel the pressure exherted by the ground to our feet.
What actually increases when the lift rises up with an acceleration?
The force used to push us up is increase, our weight does not, the resultant force
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