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19 Cards in this Set
- Front
- Back
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Newton's First Law of Motion |
An object at rest remains at rest, and an object in motion remains in motion unless acted upon by an unbalanced force |
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What is Inertia |
The tendency of an object to resist a change in motion |
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How can you increase inertia |
Increase the mass |
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Explain how the first law applies to what happens when the driver suddenly stops a car |
The people in the car jerk forward because they were already going forward and wanted to continue going forward even though the car stopped from under neath them. |
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Newton's Second Law of Motion |
An object's acceleration is related to its mass and the force being applied to it |
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What is the formula for Newton's Second Law |
F = M x A or A = F/M |
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Find the force making a 2 kg ball accelerate at a rate of 2 m/s^2 |
4 Newtons |
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Find the acceleration of a 4 kg ball that is pushed with 12 N of force |
3 m/s ^2 |
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How does increasing mass affect acceleration |
It decreases acceleration |
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How does increasing force affect acceleration |
It increases acceleration |
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Newton's Third Law of Motion |
When one object exerts a force on a second object, then the second object will exert a force equal in strength and opposite in direction on the first object |
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Describe the action/reaction forces when a person jumps on a diving board |
The action force is the person pushing down on the board. The reaction force is the board pushing the person up |
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Why do action/reaction pairs not cancel each other out? |
Because they act on different objects |
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Definition of momentum |
The strength of an object's motion - how hard it is to make an object stop moving. |
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Formula of momentum |
p = m x v |
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Units momentum is measured in |
kg x m/s |
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Find the momentum of a 5kg bowling ball that is rolling at 3 m/s |
15 kg x m/s |
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What does the Law of Conservation of momentum state |
In the absence of outside forces, when two objects collide, the total amount of momentum before and after the collision will be the same. |
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If one train car has a momentum of 10 kg x m/s and it hits another train car whose momentum is 8 kg x m/s, what must the total momentum of the two train cars be before and after the collision |
18 kg x m/s |
