physics lab report info
TRANSCRIPT
8/3/2019 Physics Lab Report Info
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VZhao
Physics:
Newtons Law of Inertia
No acceleration No change in velocity
The greater the mass of an object, the less likely its acceleration is going to change.
The greater the mass of an object, the more force youre going to need to exert on it for a given change.
Newtons Second Law
The Net Force acting on a object is equivalent to both the Mass of an Object and the
Acceleration of an object.
Force should be proportional to Acceleration.
Should be linear relationship.
Inverse of Mass should be proportional to Acceleration/Force
If y is acceleration, and x is 1/m, it should be linear.
Mass is a ScalarAcceleration is a VectorForce is also a Vector
F(net)=Summation of all Forces
If Mr. Weiland and Jason are pushing on opposite sides of a table, there are 3potential situations.
If Mr. Weiland is on the left, and Jason is on the right:
Where the right is positive:1) Fw=Fj a=0, v=0
2) Fw>Fj a>0
3) Fw<Fj a<0
The first situation is incredibly pertinent to the law of Net Force = ma
This is because there is force, but because they have equal force, there is no
acceleration. Also, its important that they be vectors, because if they are vectors, the
addition of the two vectors is 0 because they have the same magnitude of force, but
have opposite directions, but if you simply add their magnitudes they have 40 units
of force (assuming 20 units of force for each).
Newton = (kg)(m/s^2)
SI (Universal standard of measurement): 1 mass unit = 1 kg
1 acceleration unit = 1 m/s^2Unit of Force = 1N (Newton)
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VZhao
Different of Mass and Weight: Mass is the MASS (aka molecules etc, the amount of
stuff there)Weight is a force. The weight is the amount of force being applied by a unit, which is
why the weight is different on the moon, because the moon imparts a lower
acceleration on the object through gravity.
Situation 1)Vector Net Force = Vector Weiland Force + Vector Jason Force
Magnitude of Net Force = + Magnitude Weiland Force + (-) Magnitude Jason Force
Magnitude of Net Force = +20 20
Magnitude of Net Force = 0
If Magnitude of Net Force is 0, Magnitude of the Acceleration is 0 as well.
NEW SITUATION
2 kg object on ice sliding to the right. Ice is used because there is a negligible amount
of friction. All of a sudden it gets onto a rubber mat instead of ice. During the entireportion at which its on the ice, Acceleration = 0. Once it gets onto the rubber it stopsbeing 0. By the end of the rubber portion, velocity = 0. Going towards the right is
positive btdubs. Velocity will be decreasing once it hits the rubber at a constant rate,
which means a constant, negative acceleration. Because the acceleration vector is
negative, the force vector must also be negative. Friction is a restrictive force that
opposes the velocity by acting in an opposite way to the direction. If acceleration isconstant, the force is also constant (because the mass is constant). Newtons Second
Law is only applicable when theres a constant acceleration or a constant force.