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66 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are some examples of fossil fuels?
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natural gas
oil coal *The world is slowly running out of fossil fuels. |
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How are fossil fuels formed?
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Fossil fuels are formed from the remains of once-living organisms. They are nonrenewable resources.
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What is the world's most widely used fossil fuel?
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Petroleum
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What are some other energy technologies?
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Wind, solar and hydroeclectric energy.
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What force keeps the planets in orbit?
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Gravity
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The amount of matter in an object.
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Mass
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A measure of the pull of gravity on an object.
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Weight
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What 3 forces affect Earth and the objects on Earth every day?
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Friction
Magnetism Gravity |
"Forces 1-2-3....F-M-G"
F M G |
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A push or a pull that can make an object speed up, slow down or change direction.
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Force
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A change in movement (speeding up, slowing down or changing direction)
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Acceleration
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What force attracts all objects toward eachother?
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Gravity
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When an object's motion changes, you know that the forces acting on it are ________________________.
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unbalanced
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A force that acts on an object does ___________ only when the object moves.
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work
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A _______________ makes work easier by trading force for distance.
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machine
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___________________ act on an object without causing a change in the object's motion. They cancel eachother out.
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balanced forces
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A force of repulsion or attraction between objects with two poles
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magnetism
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When you rub or slide one object over another, the force of ______________ acts in the opposite direction.
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friction
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Why do a magnet's poles point north and south?
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Because Earth is a huge magnet and its magnetic field causes the needle of a compass to point north and south.
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Like poles of a magnet _______________ eachother.
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repel
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Opposite poles of a magnet brought together ___________________ eachother.
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attract
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The greater an object's ___________, the greater its gravity.
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mass
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An astronaut's weight on the moon is (1/3, 1/6, 1/8) his or her weight on Earth?
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1/6
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The greater the distance between two objects, the (more or less?) force of gravitation acts on them?
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less
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Satrun has more mass than Eath. On Saturn, the force of gravity would be much (greater/less) and you would be much (heavier/lighter).
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On Saturn, the gravity is greater and you would be heavier.
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_______________ forces are equal in size and opposite in direction.
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Balanced
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If balanced forces act on a still object, will it appear to move?
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No
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___________________ always act in pairs.
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Forces
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What happens to an object's motion when unbalanced forces act on it?
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It will ACCELERATE
(move, speed up, slow down, stop or change direction). Note: ANY change in motion--even slowing down or a stop-- is called an acceleration. |
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What is the net force when a force of 100 newtons pushes against a force of friction of 80 newtons?
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Net force =
100 - 80 = 20 newtons |
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What is the net force when a force of 100 newtons pushes in the same direction as a force of 100 newtons?
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Net force =
100 + 100 = 200 newtons |
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What is the net force when a force of 100 newtons pushes against a force of 100 newtons?
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Net force =
100 - 100 = 0 newtons |
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If balanced forces act on an object that is moving, will it result in a change in the object's speed?
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No
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If a book weighs 35 newtons and you apply a force of 50 newtons to lift it, what is the net force acting on the book?
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Net force =
50 up - 35 down = 15 newtons going up. |
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Which law of motion:
An object at rest will remain at rest, and an object in motion will continue moving in a straight line at a constant speed until an outside force acts on it. |
The First Law of Motion
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Which law of motion is also known as the Law of Inertia?
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The First Law of Motion
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Someone pulls a tablecloth out from under a table setting and the items remain in place on the table. How is this possible?
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The INERTIA of the objects on the table keeps them in place.
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In space, where there's microgravity, is it easier or harder to loosen or tighten a screw? Why?
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It's harder, because there's much less gravity to hold you in place. You'd need something to brace against.
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When did Newton formulate the Laws of Motion?
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In the 1600's.
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When a leaf falls from a tree what is the force acting on the leaf?
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Gravity
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You can exert a force on an object, but only if it moves did you do __________
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work
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"An object's acceleration depends on the SIZE and DIRECTION of the force acting on it and on the MASS of the object."
Which Law of Motion is this? |
The Second Law of Motion
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A rolling soccer ball will speed up if it's kicked from behind.
Which law of motion does this represent? |
The Second Law of Motion
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A ball on a flat, level surface stays where it is because it is left alone.
Which law of motion does this represent? |
The First Law of Motion
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(The ball is remaining at rest)
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A spacecraft continues moving at the same speed and in the same direction, practically forever.
Which law? |
The First Law of Motion
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F = M x A
CHECK THIS FORMULA FOR ACCURACY. Which law is this? What does it mean? |
Force = Mass x Acceleration
The Second Law of Motion |
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What happens to an object's acceleration as the size of the force acting on the object increases?
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The object's acceleration increases.
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"For every action, there is an equal and opposite reaction."
Which law? |
The Third Law of Motion
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A rocket engine pushes burning gases out the back of the rocket. The gases provide the force that move the rocket forward.
Which law? |
The Third Law of Motion
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The action of the burning gases pushing down produce an equal and opposite reaction of the rocket moving up.
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If an astronaut throws an object into space, what happens to the object?
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It keeps going practically forever, because there's little friction in space.
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How is the chemical energy stored in fossil fuels released?
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Through burning
(Burning fuels produce thermal energy.) |
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What measurement is used to measure energy?
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Joules
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List 4 fossil fuels.
Describe what they do. |
Coal
Oil Natural gas They release lart amounts of thermal energy when burned, so they're useful for transportation, cooking food, heating |
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Which force resists motion?
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friction
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Which law is a math formula
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The Second Law of Motion
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What are the conditions responsible for the formation of coal, oil and natural gas?
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Fossil fuels come from the remains of living organisms that were deep inside the Earth for millions of years.
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What other technologies are an alternative to fossil fuels?
Why should we use them? |
Wind energy
Geothermal energy Because they are inexhaustible |
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Why is it difficult to run on ice?
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There's less friction
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What is the change in position over time?
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Motion
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The resistance of an object to a change in speed or direction is which law?
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The First Law of Motion
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What is the unit of force?
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Newton
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Why do the other planets revolve around the sun?
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The sun's mass is larger than the other planets.
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When gravity is the force actin on an object, do all objects fall at the same or different rate?
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All objects fall at the same rate.
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How do we describe motion?
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To describe motion, we measure:
The change in Speed, Direction and Acceleration in speed over time (ex. 60 miles per hour). |
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Hockey puck doesn't move unless something hits it. Would slide in a straight line if something stopped it. This is an example of:
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The First Law of Motion
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1st Law: Inertia
2nd Law: Motion 3rd Law: For every action, there's an equal and opposite reaction |
1st: Inertia
2nd: Motion 3rd: Action/reaction |
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Examples of friction:
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Road slowing wheels
Air slowing plane Water slowing boat |
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