Study Physics Chp. 4 Review Flash Cards

 
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Physics Chp. 4 Review

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