UI Forces and Motion Flashcards
Average speed
total distance divided by total time
Velocity
quantitative measure how quickly an object moves
gradient
a value representing how much y value changes when the x
value changes by 1 unit
Light gate
a digital sensor in timing experiments
Initial speed
speed of an object before the acceleration
Final speed
speed at the end
Contact forces
a force that is applied by objects in contact with each other
Non-contact forces
a force that is applied by objects not in contact with
each other
Vector quantity
a quantity has both magnitude and direction
Scalar quantity
a quantity has magnitude only
weight
the force with which a body is attracted to Earth or another
celestial body
tension
the force resulting from the stretching of an elastic body
friction
the force due to rubbing of one body against another
Resultant force
the combined force that is the sum of a set of forces
stationary
fixed in a position
Unbalanced forces
forces that are not in equilibrium
Inversely proportional
y is proportional to 1/x
Tone up muscles
firm up muscles
Elastic deformation
deformation that disappears upon removal of the external forces
Inelastic deformation
deformation that won’t disappear upon removal of the external
extension
the difference between final length after extending and initial length
Limit of proportionality
the point up to which the stress remains directly
proportional to strain
momentum
product of mass and velocity of an object
Change of momentum
final momentum minus initial momentum
Crumple zones:
Crumple zones
a section of an automobile body designed to absorb the
force of an impact in order to protect the passengers
crash
breaking to pieces by collision
collision
an encounter between objects
Explosions
a rapid expanding or bursting
Conservation of momentum
total momentum is not changed when no
external forces act upon
