Mechanics Need to Know Flashcards
What does a vector quantity contain?
magnitude and direction
What does the magnitude of a velocity vector equal?
speed
What does the magnitude of the displacement vector equal?
distance
On a displacement time graph what does the gradient equal?
velocity
On a velocity time graph what does the gradient equal? and area equal?
gradient = acceleration, area = distance
What is value of gravity in mechanics?
9.8 and 2 s.f.
What is Newtons first law?
an object will continue in constant velocity unless acted on by an unbalanced force
WHat is newtons second law?
F=ma
What is Newtons third law?
for everyone action there is an equal/opposite action
If a pulley is smooth what is result of Tension both sides of pulley?
it is the same
What is equation for moments?
Force x Perpendicular distance, anticlockwise = clockwise
What is resultant force and resultant moment when a rigid body is in equilibrium?
0 for both
What is the reaction at other points on a rigid body when at point of tilting on a pivot?
0
