motion vocab Flashcards
acceleration
rate of change of velocity
deceleration
slowing down / negative acceleration
inertia
the tendency of an object to resist a change motion
law of conservation of momentum
the total momentum in an isolated system does not change during a collision
magnitude
the size or extent of something
momentum
how difficult it is to stop a moving object
P = mv
net force (also known as resultant force)
vector sum of all forces acting on an object
newton’s first law
an object in motion will stay in motion unless acted on by an unbalanced force
newton’s second law
the mass of an object affects the way it moves when acted on by one or more forces
F = ma
newton’s third law
every action has an equal and opposite reaction
reaction force
the force acting in the opposite direction
scalar quantity
only has size
vector quantity
has size and direction
speed
the distance travelled per unit of time
velocity
speed in a specific direction
distance
measurement of how far something travels
displacement
measurement of the straight-line distance between the finishing and starting points
what is a ticket timer?
a ticket timer is used to measure speed
how does a ticket timer work?
it’s accelerating if the dots are spread apart
if it’s at a constant speed, the dots are evenly spread
if it’s at a slow speed, the dots will be close together
list 2 ways momentum can be increased
- increasing velocity
- increasing mass
