Name: Date: Class:
1.
Gravity is a
2.
The universe. a.
On Earth, gravity is a force that affects all objects.
3.
Why do you not notice the gravitational pull to objects around you?
.
states that the force of gravity acts between all objects in the
4.
The two factors that affect the gravitational pull of two objects are
.
and a.
MASS: The more mass an object has, the
For example: b.
DISTANCE: The
its gravitational .
apart two objects are, the lesser the gravitational force between them.
For example:
5.
Explain the difference between mass and weight.
6.
When the only force acting on an object is velocity is velocity be?
the object is said to be in free fall.
7.
The rate of acceleration due to gravity is .
Here is an example: A football is dropped from the top of your house. Its starting velocity is 0 m/s, after one second it’s
. After two seconds it’s velocity is . When it is at 7 seconds what will its
8.
*Remember* Friction is in the direction opposite to motion so air resistance is an
.
9.
Air resistance increases with becomes .
force exerted on
. As a falling object speeds up, the force of air resistance
10.
*Remember* When forces are balanced there is no . So when an object reaches the point where the air resistance’s force (up) is equal to the gravitational pull’s force (down) the object
but the velocity .
11.
The greatest velocity a falling object reaches is called . Terminal velocity is reached when
.

Name: Date: Class:
1.
Gravity is a force that pulls objects toward each other.
2.
The Law of Universal Gravitation states that the force of gravity acts between all objects in the universe. a.
On Earth, gravity is a downward force that affects all objects.
3.
Why do you not notice the gravitational pull to objects around you?
You are attracted to the Earth and all the objects around you but you do not feel the gravitational pull to objects around you because the attraction among those objects is very small compared to the gravitational pull of Earth.
4.
The two factors that affect the gravitational pull of two objects are mass and distance. a.
MASS: The more mass an object has, the greater its gravitational force.
For example: Because the sun’s mass is so HUGE it exerts are very large gravitational pull. Thus the planets surrounding it orbit the sun. b.
DISTANCE: The farther aprat two objects are, the lesser the gravitational force between them.
For example: When a space ship takes off, the farther away it gets from Earth the less the Earth’s gravitational pull is on it.
5.
Explain the difference between mass and weight.
Mass is a measure of the amount of matter in an object but weight is a measure of the gravitational force that is exerted on
an object.
6.
When the only force acting on an object is gravity the object is said to be in free fall.
7.
The rate of acceleration due to gravity is 9.8m/s.
Here is an example: A football is dropped from the top of your house. Its starting velocity is 0 m/s, after one second it’s velocity is . After two seconds it’s velocity is . When it is at 7 seconds what will its velocity be?
68m/s
8.
*Remember* Friction is in the direction opposite to motion so air resistance is an upward force exerted on falling objects.
9.
Air resistance increases with velocity. As a falling object speeds up, the force of air resistance becomes greater and greater.
10.
*Remember* When forces are balanced there is no acceleration. So when an object reaches the point where the air resistance’s force (up) is equal to the gravitational pull’s force (down) the object continues to fall but the velocity remains constant.
11.
The greatest velocity a falling object reaches is called terminal velocity. Terminal velocity is reached when the force of air resistance equals the weight of the object.