# Physics - Science Yearly

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How do you calculate speed?
Distance over time
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How do you calculate time?
Distance over speed
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Define acceleration as a change of speed over time?
The speed and direction of an object changes when the forces acting on it are unbalanced
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State Newton's First Law of Motion. (Law of Inertia)
An object will continue in a state of rest unless an unbalanced external force causes it to change that state.
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State Newton's Second Law of Motion.
An unbalanced force will change an object's state of motion by producing acceleration.
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State Newton's Third Law of Motion.
For every action (force) on an object, there is an equal and opposite reaction by the object upon the agent.
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Distinguish the difference between mass and weight.
Mass is a measure of how much matter an object has, however, weight is a measure of how strongly gravity pulls on that matter.
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How do different types of electromagnetic radiation provide us with information about the Universe?
Different types of electromagnetic radiation provide us with information about the universe, as it allows telescopes to see black holes and the remnants of large stars.
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What are 2 advantages of space probes?
1. Exploration and new knowledge of the Universe 2. Can look for life-sustaining plants or past planets.
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What are 2 disadvantages of space probes?
1. Expensive 2. The next step in space exploration is still not defined
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What is a galaxy?
A gravitationally bound body, typically consisting of dark matter, fast dust and stars.
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What are stars?
Stars are luminous balls of gas, mostly hydrogen and helium, held together by its own gravity.
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What is a Nebula?
A nebula is an interstellar cloud in outer space made up of dust, hydrogen, helium gas and plasma.
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What is the Doppler effect?
A change in frequency and wavelength.
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## Other cards in this set

### Card 2

#### Front

How do you calculate time?

#### Back

Distance over speed

### Card 3

#### Front

Define acceleration as a change of speed over time?

### Card 4

#### Front

State Newton's First Law of Motion. (Law of Inertia)

### Card 5

#### Front

State Newton's Second Law of Motion.