notes on force, pull, push, pressure, gravity, and friction.
Answers
Gravitational attraction depends on the mass of the two objects and the distance they are apart.
Objects on Earth are pulled toward the center of Earth.
The force of gravity, like all other forces, can cause changes in the speed of objects. As an object falls, its speed will continually increase as Earth’s gravity continually pulls it downward. When air resistance is ignored, all objects will speed up at the same rate as they fall.
Gravity can also cause an object that is thrown into the air to change its upward motion, slow down, and fall back toward Earth’s surface.
The pull of Earth’s gravity keeps the Moon in orbit; the moon is constantly changing direction because of gravity.
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Force
A push or pull on an object is known as force.
The S.I. Unit of force is
Newton.
Pressure
Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid. ... In SI units, pressure is measured in pascals; one pascal equals one newton per square metre. Atmospheric pressure is close to 100,000 pascals.
Gravity
The force that pulls every thing towards the surface of the earth is known as gravity.
Friction
Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.
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