forces Flashcards
what is inertia and how is it related to a passenger on a roller coaster?
inertia- the tendency for objects to stay in motion if they are in motion and stay at rest if they are at rest
this relates to a person on a roller coaster because they will want to keep moving after the coaster stops
explain newton’s second law of motion in terms of force, mass and acceleration.
the acceleration of an obj. is directly prop. to the force acting on it & inversely prop. to the force acting on it & inversely prop. to the mass force-acceleration-mass-force
what is the acceleration of a 30 kg object being pushed with a force of 60 N?
30
how much force is required to move a 100 kg obj. at an acceleration of 3 m/s2?
300 N
what is the difference between weight and mass?
mass- stays the same
weight- changes depending on the amt. of gravity
explain newtons third law in terms of action and reaction forces
every action has an equal and opposite reaction
explain how the third law of motion explains rocket flight
fuel is ignited/burned, creates pressure, rocket pushes on this, fuel pushes back on the rocket
what is a net force
total amt. of all forces acting upon an object
my brother took my wii-mote and i want it back. if i am pulling it left with a force of 10 N and he’s pulling it right with a force of 8N, what is the net force on the wii-mote? am i gonna get it back?
2N. yes, you will get it back
what is the law of universal gravitation
force of attraction between obj. is related to their mass and distance between them
what two factors in the universal law of grav. are most important in determining the force of gravity between tow objects
mass & distance
what is centripetal force? name an example
keeps objects in a circular path; moon orbiting earth
distinguish between rotation and revolution and on earth.
using the data below, which of these would be faster?
distance time
rotation 40,000 km 24 hours
revolution 942,000,000 km 8766 hours
rotation- on an axis
revolution- around a center obj.
revolution is faster
