anything that can cause change in speed, direction of motion & shape of an object
force
contact forces
friction
non-contact forces
gravity, magnetism
unit of force in MKS
Newton (N)
unit of force in CGS
dynes (d) = 10^ - 5 Newtons
English unit of force
pound (lb)
used to measure forces
spring balance
forces acting at one point
concurrent force
combined effect of the forces applied
resultant force
force equal to resultant but in opposite direction
equilibriant force
resistance when one body is moved against another body
friction
what type of friction is from stationary position
static
what type of friction is from sliding surfaces
sliding
what type of friction is from rollers
rolling