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Term
| two factors that have an effect on friction |
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Definition
1) how hard the surfaces push together
2) the types of surfaces involved |
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| the force that two surfaces exert on each other |
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Definition
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| type of friction that acts on objects that are not moving |
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| type of friction when two solid surfaces slide over each other |
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| type of friction when an object rolls over a surface |
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| type of friction when a solid object moves through a fluid |
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Definition
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| ball bearings in skateboards exhibit this type of friction |
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Definition
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| T/F fluid friction is greater than sliding friction |
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Definition
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| T/F air resistance is a type of fluid friction |
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Term
| what two factors determine the gravitational pull between two objects |
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Definition
1) their mass
2) the distance between the two objects |
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| T/F the farther apart two objects are, the greater the gravitational pull between them |
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| T/F You weigh more on the Moon than you do on Earth. |
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| the greatest velocity a free falling object can reach is... |
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Definition
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| an object at rest or in motion will remain at rest or in motion unless it is acted on by an unbalanced force |
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Definition
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| an object's resistance to change in motion |
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Definition
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| Newton's 2nd Law of Motion |
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Definition
| force = mass times acceleration |
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Term
| How can a truck have the same momentum as a bike? |
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Definition
| If the truck is moving very slow and the bike is moving very fast. |
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Definition
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| If an object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object |
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Definition
| Newton's 3rd Law of Motion |
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Term
| What is the momentum of a bird with a mass of 0.018 kg flying at 15 m/s? |
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Definition
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| A speedboat pulls a 55 kg water skier. The force causes the skier to accelerate at 2.0 m/s2. Calculate the net force that causes this acceleration. |
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The table below shows the mass and velocity of four animals. Which animal has the greatest momentum?
mass(kg) velocity (m/s)
cheetah 45 20
grizzly bear 200 13
hyena 70 18
wild turkey 11 7 |
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Definition
| grizzly bear (2600 kg-m/s) |
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Term
A 7.3 kg bowling ball accelerates at a rate of 3.7 m/s2. What force acts on the bowling ball? |
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Definition
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Term
T/F The greater the mass of an object, the greater its inertia. |
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