Forces and Motion Ch2 Flashcards
what is the equation for speed
distance/ time
what is velocity
same thing as speed but includes direction
what is acceleration
a change in speed (velocity) in a given amount of time
distance/ time/ time
what is the measurement for gravity
9.8 m/s/s or 10m/s/s
what is the unit for force
newtons (N)
what is the tool used to measure force
newtinmeter
what is Newtons first law of motion
if no external forces are acting then the object is either:
A) stationary
B) in constant velocity
describe terminal velocity
- as objects falling increases in velocity the air resistance increases as well
- eventually the weight=air resistance
- when this happens the object will no longer accelerate and will reach terminal velocity
what is the meaning of inertia
an objects resistance to acceleration and deceleration
what is resultant force
- the net force applied on an object from multiple sources
- typically seen when 2 forces are acting on an object from opposite directions
what is the equation for force
mass (kg) x acceleration (m/s/s)
what is 1 newton
1kg moving at an acceleration of 1 m/s/s
what is static friction
friction that is present between stationary objects
ag. holding a pen
what is dynamic friction
friction created from the movement of objects in constant with each other
it is increased as the speed increases
what is friction
when kinetic energy gets converted to thermal energy
air resistance is equal to
drag
what is the equation for weight
mass (kg) x gravitational field strength (m/s/s) or (N/kg)
what is the equation for weight
mass (kg) x gravitational field strength (m/s/s) or (N/kg)
what is Newtons third law of motion
every action (force) has an equal and opposite action (force)
what is the equation for momentum
mass (kg) x velocity (m/s)
what is the equation for resultant force
change in momentum/ change in time
what is the equation for impulse
force x time
what is a rule on momentum
momentum will be the same value before and after a collision
what is a vector
measurement with direction
what is a scale
measurement without scale
how do you find a total vector when more then one is acting on an object
A) same direction: add
B) opposite direction: the difference (minus)
C) different direction: the equations
