Topic 9 - forces and their effects Flashcards
What is a force?
A push or pull acting on an object due to an interaction with another object
What are the two categories that all forces can be split into?
Contact and non-contact
Give three examples of contact forces
Friction
Air resistance
Tension
Give three examples of non-contact forces
Gravitational
Electrostatic
Magnetic
Is force a vector or a scalar quantity?why?
Vector
It has both magnitude and direction
What is a scalar quantity?
A quantity that only has a magnitude
What is a vector quantity
A quantity that has both magnitude and direction
Give three examples of vector quantities
Velocity
Displacement
Force
Give 6 examples of scalar quantities
Temperature Time Mass Speed Distance Energy
How are vectors represented?
Vector arrows
Length indicates magnitude
Arrow indicates direction
What is an alternative name for the turning effect of a force?
A moment
What is the equation to calculate the moment of a force?
Force x distance
What distance measurement is used when calculating a moment?
The perpendicular distance from the pivot to the line of action of the force
If an object is in equilibrium, what can be said about the moments acting on the object?
The clockwise moments are equal to the anti-clockwise moments
How do levers make use of moments?
They increase the perpendicular distance of the force from the pivot so they decrease the force needed to produce the same moment
