Forces Flashcards
(29 cards)
what is newtons first law
a body will remain at rest or continue in a straight line at a constant speed as long as the forces acting on it are balanced
what is the resultant force
the overall force acting on an object
what is newtons second law
when a resultant force acts on a mass then there will be a change in its velocity
what is the formula for force
force = mass * accelaration
what is inertial mass
a measure of how difficult it is to change the velocity of a moving object
what is weight
the force that a body experiences due to its mass and the size of the gravitational feild
what is mass
the amount of matter
what is weight measured in
Newtons
what is mass measured in
Kg
what is the formula for weight
mass * gravity
what 2 factors affect the strength of gravity
the mass of the body
the radius of the object
what tool is used to measure weight
Newtonmeter
what force causes circular motion to occur
centripetal force
what force causes the centripetal force of a car on a turn
friction
what is momentum in simple objects
the power of a moving object
what is the formula for momentum
mass * velocity
what is the equation for the force that uses momentum
change in momentum/time taken
what is newtons third law
for every action, there is an equal and opposite reaction
give an example of newtons third law (use man and wall) and why it is
man pushing on the wall
wall(normal contact) pushing on man
needs to act on 2 different objects
momentum is c…
conserved
what is the average human reaction time
0.2
what is the definition of human reaction time,
the time it takes between a stimulus and a response
what 4 factors affect the reaction time of drivers
tiredness
alcohol and drugs
distractions
age
what is stopping distance
the total distance over which a vehicle comes to rest
