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| What are the different ways an object can accelerate? |
speed up
slow down
turn |
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noblejas Wed, 08 Oct 2008 03:11:51 GMT |
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| When measuring acceleration with photogates, how do you measure vi and vf? |
take the length of the object (usually post-it) and divide it by the time from the computer |
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noblejas Tue, 07 Oct 2008 07:39:43 GMT |
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| When measuring acceleration with photogates, what is ∆t? |
the time in for the object to go from gate 1 to gate 2 |
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noblejas Tue, 07 Oct 2008 07:39:43 GMT |
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| When measuring acceleration with photogates, what is ∆x? |
the distance between the gates? |
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noblejas Tue, 07 Oct 2008 07:39:43 GMT |
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| What does mass tell us? |
How hard it is to change the velocity of an object |
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noblejas Tue, 07 Oct 2008 07:39:43 GMT |
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| What are the usual units for mass? |
kg |
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noblejas Tue, 07 Oct 2008 07:39:42 GMT |
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| What is mass? |
How much matter there is in an object |
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noblejas Tue, 07 Oct 2008 07:39:42 GMT |
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| What is friction? |
A push from a rough surface due to the rubbing of the surfaces. |
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noblejas Tue, 07 Oct 2008 07:41:38 GMT |
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| What is tension? |
The pull from a rope or string |
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noblejas Tue, 07 Oct 2008 01:28:26 GMT |
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| What is a normal force? |
A push upward from a surface |
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noblejas Tue, 07 Oct 2008 01:28:26 GMT |
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| What is weight? |
How hard the Earth or a planet pulls on an object |
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noblejas Tue, 07 Oct 2008 01:28:26 GMT |
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| What does the acceleration tell us about an object? |
How quickly it is speeding up or how quickly it is slowing down |
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noblejas Tue, 07 Oct 2008 01:28:26 GMT |
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| What does Newton's 2nd Law say? |
a = F(net)/m
- more net force, more acceleration
- more mass, less acceleration |
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noblejas Tue, 07 Oct 2008 01:13:17 GMT |
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| How do you draw a free-body diagram? |
1. draw the object by itself
2. draw and label all the forces around it. |
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noblejas Tue, 07 Oct 2008 01:13:17 GMT |
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| How do you calculate the Force of Fricion on an object? What direciton does it point? |
F = N
opposite the direciton of motion |
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noblejas Tue, 07 Oct 2008 01:09:35 GMT |
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| How do you calculate the tension of an object? What direciton does it point? |
It is usually given.
In the direciton of the rope. |
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noblejas Tue, 07 Oct 2008 01:09:35 GMT |
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| How do you calculate the normal force? What direciton does it point? |
It cancels all the forces that are in the vertical direction.
Perpendicular to the surface |
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noblejas Tue, 07 Oct 2008 01:09:35 GMT |
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| How do you calculate the weight of an object? What direciton does it point? |
W = mg
straight down |
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noblejas Tue, 07 Oct 2008 01:09:35 GMT |
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| What are the four common forces that usually act on an object? |
weight
normal
tension
friction |
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noblejas Tue, 07 Oct 2008 01:09:35 GMT |
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| How do you combine forces that are perpendicular to each other? (e.g. one north and one east) |
use the pythagorean theorem |
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noblejas Tue, 07 Oct 2008 01:09:35 GMT |
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| How do you combine forces that are pointing in oppposite directions? |
subtract them |
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noblejas Tue, 07 Oct 2008 01:09:35 GMT |
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| How do you combine forces that are pointing in the same direction? |
add them |
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noblejas Tue, 07 Oct 2008 01:09:34 GMT |
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| What is a net force? |
the combination of all forces |
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noblejas Tue, 07 Oct 2008 20:07:40 GMT |
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| What are the units for force? |
Newtons (N) |
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noblejas Tue, 07 Oct 2008 01:09:34 GMT |
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| What is a force? |
a push or pull |
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noblejas Tue, 07 Oct 2008 01:09:34 GMT |
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| What does Newton's 1st Law say? |
objects want to stay at constant velocity |
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noblejas Tue, 07 Oct 2008 01:09:34 GMT |
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