Forces Flashcards
3 types of forces
Push, pull and twist
Limit of proportionality
The point at which the load- extension graph becomes non-linear
Spring constant
Force per unit extension
Resultant force
May change the velocity if an object by changing its direction of motion of its speed
Newton’s first law
An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.
Newton’s second law
The acceleration of an object depends on the mass of the object and the amount of force applied
Centripetal force
a net force that acts on an object to keep it moving along a circular path
Moment
Moment = force × perpendicular distance from pivot
Law of moment
“In the equilibrium condition of lever, the sum of the anticlockwise moment is equal to the sum of the clockwise moment”
Fulcrum
the support about which a lever turns
Equilibrium
When there is no resultant force and no resultant moment
Centre of gravity
the point through which all of an object’s weight can be considered to act
Stable equilibrium
a state in which a body tends to return to its original position after being disturbed
Unstable equilibrium
a state of equilibrium in which a small disturbance will produce a large change
Neutral equilibrium
if its equilibrium is independent of displacements from its original position
