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.