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| a push or a pull, measured in Newtons |
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| the overall result of several forces acting upon an object |
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| a force that opposes (resists) the motion of objects |
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| frictional force that opposes motion between two objects that are NOT moving |
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| frictional force that occurs when an object slides over a surface |
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| frictional force as an object rolls over a surface |
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| frictional force as an object moves through a fluid (or air) |
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| friction force between and object and the moving air atoms around it |
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| force acting between any two objects with mass |
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| maximum speed an object can fall at given its mass and acceleration due to gravity |
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| motion of a falling object after its given initial forward velocity |
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| Tendency of an object to resist a change in motion |
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| Measure of the amount of inertia an object has and depends upon the amount of matter the object contains |
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| force of gravity acting upon an object |
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Definition
the product of an objects mass and velocity
P= MV |
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| How do forces affect the motion of an object? |
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Definition
| A force can cause a resting object to move or a moving object to accelerate. |
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| What are the four main types of friction? |
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Definition
| static, rolling, sliding, fluid |
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| How do gravity and air resistance affect a falling object? |
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Definition
| gravity causes the object to accelerate downward, air resistance acts in the opposite direction of the falling and reduces acceleration |
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| In what direction does Earth's gravity act? |
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Definition
| downward toward the center of Earth |
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| Why does a projectile follow a curved path? |
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Definition
| Because there is a combined force of the forward velocity and the downward force of gravity. |
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| How does Newton's second law relate force, mass, and acceleration? |
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Definition
F = M x A
Mass & Acceleration are inversely proportional. |
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| How are weight and mass related? |
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Definition
| The more mass, the more force of gravity and therefore the more weight. |
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| Which of Newton's laws states that an object at rest stays at rest and an object in motion stays in motion? |
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Definition
| Newton's first law: The law of inertia |
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| When you go to the moon, what changes your mass or your weight? Why? |
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Definition
| Your weight, the amount of matter in your body is the same but the gravitational pull of the moon is different. |
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| The law of conservation of momentum states: |
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Definition
| If not force acts on an object, momentum stays the same. In a closed system momentum is transfered between objects |
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| What type of forces does Newton's 3rd Law deal with? |
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Definition
| Action and Reaction Forces |
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| What are the three universal forces? |
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Definition
| Gravity, Electromagnetic, Nuclear |
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| Which of the universal forces can repel and attract? |
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| Which universal force is found in the center of atoms? |
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| The law of universal gravitaion states: |
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| Every object in the universe exerts gravitational force upon every other object in the universe. |
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| Which universal force is responsible for our tides? |
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| Which universal force acts over the longest distances? |
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