Ch. 12 Pt. 2 Quiz Flashcards
Momentum is calculated by multiplying what?
mass and velocitoy
What is momentum measured in?
km x m/s
According to Newton’s third law of motion, what happens whenever one object exerts a force on a second object?
the second object exerts an equal but opposite force on the first object
The equal and opposite forces described by Newton’s third law are called _________ and _________ forces.
action
reaction
What factors affect the momentum of a moving object?
mass
velocity
If two identical objects are moving at different velocities, the object that is moving faster will have __________ momentum.
greater
If your shoes are in a box on a shelf, what is the momentum?
zero
What is the formula for momentum?
momentum=mass(kg) x velocity(m/s)
In a closed system, objects can exert forces on one another, but other objects and forces cannot ________ or __________ the system.
leave
enter
List the differences between strong nuclear forces and weak nuclear forces.
Strong- acts on neutrons and protons, acts over a very short distance, and is very strong
Weak- acts on all particles, acts over a short distance, weaker then the strong force
What are the four forces universal forces?
electromagnetic
weak nuclear
strong nuclear
gravitational
Name the only two forces that can both attract and repel.
electric and magnetic
What evidence suggests that nuclear forces have a powerful force of attraction?
the nucleus of an atom doesn’t explode
State Newton’s law of universal gravitation.
every object in the universe attracts every other object in the universe
the gravitational force of attraction between two objects depends on what?
mass
distance
The sun’s mass is much greater than the mass of Earth, so the sun’s gravitational pull is much ________ then that of Earth’s.
stronger
Why does the moon orbit Earth in a nearly circular path?
the moon’s inertia and centripetal force
What is the primary cause of Earth’s ocean tides?
the gravitational pull of the moon
List four uses of artificial satellites.
monitor weather
receive and transmit cell phones and television signals
gaze into space
study Earth’s climate
