Name Directed Reading for Section 3 Using Newton's Laws
Content Mastery
Directions: Complete the paragraphs by using the words listed below to do in the banks
9.8 m/s accelerate air resistance conservation of momentum
continues decelerate equals
fall
freefall
gravity laws of motion momentum satellites
straight line
terminal velocity velocity weightlessness
Newton's 1.
can be used to explain events in the natural
world, such as how a pencil falls to the floor and how planets revolve around the
Sun. In the absence of air, all objects fall at the same rate, because the force of Earth's
gravity causes objects to 2.
by 3.
4.
can eventually counteract the acceleration from
5.
This is why a flat piece of paper falls slowly, but
when the same paper is crumpled, it falls quickly. When the upward force of
air resistance on an object 6
the downward force of gravity on
the object, its 7
stops increasing. This is called the object's
8.
9.
orbit Earth because of gravity. They travel very fast, but
with each meter forward that they travel, they 10.
just a tiny bit
due to Earth's gravity. Astronauts in Earth's orbit experience 11
because they are in 12.
Without gravity, satellites would con-
tinue in a 13.
away from Earth
Newton's laws also describe what happens in collisions. For example, in a moving
car, a passenger is also in motion. When the car comes to a sudden stop, the passenger
14.
in motion. To protect the passenger from striking the inside
of the car, seatbelts and airbags 15.
passengers slowly. Also, the
16.
describes what happens in a collision. When two objects
collide, the total 17.
of the objects before the collision equals the
total momentum of the objects after the collision.
Forces and Newton's Laws