T5 forces and their interactions Flashcards
what is a scalar quantity
- quantity that only has a magnitude
- quantity that isn’t direction dependent
what is a vector quantity
- quantity that has both a magnitude and an associated direction
how can a vector quantity be drawn and what does it show
- as an arrow
- length of the arrow represents the magnitude
- arrow points in the associated direction
what is a force
push or pull acting on an object due to an interaction with another object
what are the 2 categories that all forces can be split into
- contact forces (objects touching)
2. non-contact forces (objects separated)
give 3 examples of contact forces
- friction
- air resistance
- tension
give 3 examples of non-contact forces
- gravitational forces
- electrostatic forces
- magnetic forces
is forces a vector or a scalar quantity
- vector
- has both a magnitude and an associated direction
give 3 examples of vector quantities
- velocity
- displacement
- force
give 3 examples of scalar quantities
temperature, time, mass
speed, distance, energy
what is weight
force that acts on an object due to gravity and the object’s mass
what quantities does weight depend on
weight = mass x gravitational field strength
- the object’s mass
- gravitational field strength at the given position in the field
unit used for weight
Newton (N)
unit used for gravitational field strength
N/kg
what is meant by an object’s centre of mass
single point where an object’s weight can be considered to act through
