Карточки Chemistry, Physics and Astronomy | Quizlet

gravity (n)

force that causes objects to be attracted toward each other because they have mass

Example: The Earth's ____________ causes objects to fall to the ground.

phenomenon (n)

something that is observed to happen on exist

Example: The northern lights are a fascinating physical _____________________.

velocity (n)

speed and direction of travel

Example: A speedometer measures the ________________ of a moving train or car.

acceleration (n)

a change in velocity

Example: The rate of _____________________increased as the rocket's engines produced more thrust to overcome Earth's gravity.

altitude (n)

height above sea level

Example: The _______________ is much higher on top of the mountain.

oxygen (n)

A gas that forms part of the Earth's atmosohere and is essential for life.

hydrogen (n)

colourless, highly flammable gas

element (n)

One of the simplest chemical substances that cannot be broken down.

dense (adj)

having a lot of mass when compared to its volume

Example: Wood is less ______________ than water.

mass (n)

the amount of material in something.

satellite (n)

object in space that circles around another object

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