Mechanics Flashcards
What is a scalar quantity
Something with magnitude only
What is a vector quantity
Something with magnitude and direction
What is the meaning of equilibrium
An object at rest or moving with constant velocity
What is a moment
Force × perpendicular distance from the point to the line of action of the force
What is a couple
A pair of equal and opposite co-planar forces
What is the principle of moments
When an object is in equilibrium, the sum of the anticlockwise moments about a turning point must be equal to the sum of the clockwise moments
What is the centre of m`ass
Where the mass of an object is thought to be concentrated/ to be considered to act
Where is the position of the centre of mass of uniform
regular solid
At its centre
Air resistance increases…
With speed
What is terminal velocity
The velocity at which a falling object ceases to accelerate downward
What is newton’s first law of motion
If an object is moving at a constant velocity, it will continue until an external force is applied to it
What is newton’s second law of motion
F=ma
What is newton’s third law of motion
Every action has an equal and opposite reaction
What occurs in an inelastic collision
Momentum is conserved, but kinetic energy is not conserved
What is the principle of conservation of energy
Energy can neither be created nor destroyed; rather, it can only be transformed from one form to another
