CH.12 Key concepts Flashcards
How do forces affect the motion of an object
can cause a resting object to move Or it can accelerate a moving object by Changing the object speed or Direction
What are the four main types of friction
Static friction sliding friction rolling friction fluid friction
How do gravity and air resistance affect the motion of an object
Gravity causes objects to accelerate downward Whereas air resistance acts in the direction Opposite to the motion and reduces acceleration
Why does a projectile follow a curved path
Combination of an initial forward velocity and the downward vertical Force Of gravity Casues the projectile to follow a curved path
How does newton’s first law relate change in motion to a zero net force
The state of motion of an object does not change as long as the net force acting on the object is zero
How does newton’s second law relate force, mass, and acceleration
Acceleration is equal to the net force acting on it divided by the object’s mass
How are weight and mass related
Mass is a measure of the inertia of an object; weight is a measure of the force of gravity acting on the object
What is newton’s third law of motion
Whenever one object exerts a force on second object, the second object exerts an equal and opposite force on the first object
What is needed for an object to have a large momentum
If the product of its mass and velocity is large
How is momentum conserved
The loss of momentum of one object equals the gain in momentum of another object
What forces can attract and repeal
Electric forces and magnetic forces are the only forces that can attract and repeal
What forces hold the nucleus together
Strong and weak nuclear force
What is newton’s law of universal gravitation
STATES THAT EVERY OBJECT IN THE UNIVERSE ATTRACTS EVERY OTHER OBJECT
