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Gravity and friction are two kinds of __________ .
Forces
All objects fall toward the _______________ of the Earth.
center
All objects are attracted to each other because of _________________.
gravity
The gravitational force exerted by the Earth on an object is equivalent to the object’s weight.
Fact
Gravity is a contact force that acts between two separate objects.
Bluff
Anything that goes up ultimately goes down.
Fact
The principle of gravity was discovered by Sir Isaac Newton.
Fact
Gravity on the Moon is greater than on Earth.
Bluff
Gravitational pull between objects increases as the distance between them decreases.
Bluff
The greater the mass of an object, the greater the pull of gravity on it.
Fact
Mass is the measure of how much matter there is in a body or object.
Fact
Gravity does not depend on the masses of the object and the distance between two objects.
Bluff
Weight is the force that gravity exerts on an object.
Fact
Gravity is a noncontact force.
Fact
Gravity was observed by Isaac Newton.
Fact
