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Definition
| A force is a push or pull. |
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| What type of forces can be physically on an object? |
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Definition
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| What are the three forces that can push or pull objects even though they are seperated? |
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Definition
| The three forces are gravity, electrostatic forces, and magnetism |
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| What is the unit of force? |
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| How many Newtons does it take to lift a one liter bottle? |
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| When many forces are pushing/pulling an object, we can determine the? |
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| Forces going in opposite directions try to? |
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| Forces going in the same direction try to? |
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| An arrow on a free body diagram is called a? |
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| What is Newtons first law of motion? |
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Definition
| An object at rest will remain at rest, and an object in motion will remain at motion, in a straight line, at a constant speed, unless acted upon by a NET external force. |
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| The reason an object stops moving on earth is caused by? |
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Definition
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| The NET force on any unpowered moving object on earth is NEVER zero because? |
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Definition
| Friction always opposes it. |
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Definition
| Friction creates an acceleration in the opposite direction of motion. |
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| Once you are moving in space, what happens? |
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Definition
| You go in the direction, at that speed, forever. |
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| The only way to make something move or change direction is to? |
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Definition
| Put an unbalanced force on it so the NET force is not zero. |
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Term
| Rockets only need their engines to do what? |
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Definition
| To speed up, slow down, or change direction. |
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Term
| When a NET force is placed on an object, what will the object do? |
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Definition
| The object will accelerate in the direction of the NET force |
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Term
| Whenever an objects state of motion is being changed, the object is? |
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Definition
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Term
| What two things determine how much an object will accelerate? |
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Definition
| The magnitude of the NET force and the inertia |
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Definition
| Inertia is how much an object resists any change in motion. |
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| A tennis ball has less ____ then a bowling ball |
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Definition
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| How much inertia an object has depends on its what? |
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Definition
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| If you double an objects mass, you double its? |
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Definition
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| Mass is measured in what? |
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Definition
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Term
| Newtons 2nd law says what? |
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Definition
| The bigger the NET force you put on an object, the larger its acceleration, and the bigger the mass of the object, the smaller its acceleration. |
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Term
| What does Newtons 2nd law allow you to calculate? |
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Definition
| The magnitude of the acceleration of any object (as long as you know the NET force acting on it.) |
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Term
| A newton is the NET force required to make a _ kilogram mass accelerate at 1m/s |
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Definition
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| Every time an object pushes on a second object, the second object will? |
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Definition
| Push back with EXACTLY the same force, for EXACTLY the same amount of time, in the opposite direction. |
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Definition
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| You must give exactly the same push that you __ and get exactly the same push that you __ |
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Definition
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Term
| To walk, you must do what? |
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Definition
| You have to push the ground backwards in order to move forward. Then the ground MUST give you a push forwards |
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Term
| What is Newtons third law? |
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Definition
| For every action, there is an equal and opposite reaction |
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Definition
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Definition
| Isaac Newton's great Law of Gravitation |
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| What is Newtons Law of Gravitation? |
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Definition
| Fg = Gm1m2/r2(squared) EXPLANATION: Fg is the force of gravity between them in Newtons. m1 is the mass of the first object. m2 is the mass of the secod object. r is the distance between the two objects. G is the "Gravitational Constant. It is equal to 6.673 x 10 (the the power of) -11 NM(squared)/kg(sqaured) |
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| The graviational pull between two objects is directly related to the? |
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Definition
| It is directly related to the mass of the two objects. |
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Term
| The Law of the Gravitation also says that the gravitational pull between the two objects is inversly related to? |
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Definition
| the amount of distance between the two objects. (You double the distance, the pull is now 1/4. Triple it, and the distance is 1/9) |
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Term
| The Law of Gravitation explains what? |
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Definition
| How the solar system was formed |
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Term
| When you are standing on a planet, what is happening? |
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Definition
| The planet is pulling you in its own direction. But, all the forces are cancelling each other out, leaving you standing on the planet. |
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Term
| What is our weight on earth caused by? |
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Definition
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Term
| Weight is a force equal to the mass of an object multipled by the? |
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Definition
| Acceleration due to gravity. |
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Term
| Why will your weight change as you visit different objects in outer space? |
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Definition
| Because the acceleration due to gravity is different on each object. |
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Term
| What is the symbol used to represent weight, or the force of gravity? |
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Definition
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| Are weight and mass the same thing? |
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Definition
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Term
| If you go to a planet where the acceleration due to gravity is different, your weight will change, but not your ___ |
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Definition
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Term
| What is the only way to lose mass? |
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Definition
| The only way to lose mass is to lose atoms. (Chopping off your arm. |
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Term
| Weight is a force that is _____ |
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Definition
| Always present (Even in outer space. =P) |
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Term
| Another kind of force on earth is a ___ force. |
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Definition
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Term
| When standing on the floor, you are not accelerating through the floor. This is because another force is acting upwards and cancelling out your weight. This is the force the floor is putting back on you, called a? |
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Definition
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| Normal forces are always exerted ____ |
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Definition
| perpendicular to the surface |
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Term
| A vertical surface would exert its normal force ___ |
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Definition
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| A tile on a ceiling would exert its force ___ |
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Definition
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| What is the symbol for normal force? |
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Definition
| Fn (It's really a capital n, but it's below the F, and I can't do that on my computer. And this is NOT NOT NOT Fnet.) |
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Term
| When you are swinging an object in a circle, the object wants to do what? |
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Definition
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| The direction and speed of the object put together are the objects what? |
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Definition
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| The object will have a different what at every point in the circle? |
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Definition
| Instaneous velocity (Because the direction will be different) |
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Term
| To move in a perfect circle, you need what pointing perpendicular to the instaneous velocity? |
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Definition
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Term
| What is the force that points perpendicular to instaneous velocity called? |
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Definition
| A centripetal force. (This means center searching.) |
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Term
| Why do objects go in circles? |
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Definition
| Because something is forcing them to. |
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Term
| When you swing an object in a circle, the centripetal force is supplied by what? |
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Definition
| The tension in the string. |
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Term
| When an object is in a circular orbit around earth, the centripetal forcce is supplied by what? |
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Definition
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| A tight turn requires more ___ force than a more gradaul turne. |
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Definition
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| Centripetal forces are often described in terms of what? |
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Definition
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Term
| If you are feeling a force equal to your own weight, you are experiencing _ G |
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Definition
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| When you stand on the floor, you are not feeling your weight pressing you down into the ground, you're feeling? |
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Definition
| The normal force of the floor pushing you up. |
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Term
| A bathroom scale would change on the elevator because? |
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Definition
| The bathroom scale is measuring the normal force up from the floor, not your weight. |
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Term
| Falling objects caan't put any normal forces on what? |
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Definition
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Term
| When in a car, you're not feeling acceleration pressing you back in to your seat, you're feeling? |
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Definition
| The normal force on the back of your seat pushing you forwards. |
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Term
| When you feeling as though you are being pushed into a wall by an outside force, it is called a? |
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Definition
Centrifugal force - THIS IS IMAGINARY!!!
IT DOES NOT EXIST! |
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Term
| When you are spinning, you are not being pushed into the wall by an outside force, you are? |
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Definition
| Being pushed on by the wall. (The wall is pushing inwards into you.) |
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