When finding magnitude, or the x or y component of a magnitude, what is a good equation to remember?

Pythagorean theorem (think in triangles!) F^2 = Fx^2 + Fy^2

Name 6 types of force.

Weight (Fg), Spring force (Fspring), Tension force (T), Normal force (N), Frictional force (f), Thrust (Fthrust)

What is Newton's first law?

A body at rest remains at rest; one in motion remains in motion at a constant velocity unless acted upon by a net external force

What is Newton's third law?

When one body exerts a force on a second body, the first body experiences a force equal and opposite in direction.

What is an inertial reference frame, and do Newton's laws still apply within one?

It's a non-accelerating frame (when v=0 or is constant). Newton's laws work the same because there's no acceleration being acted; so a marble in an airplane going at constant velocity acts the same as if the airplane were at rest.

If a mosquito runs into a truck, does the mosquito exert the same amount of force on the truck as the truck does on the mosquito?

Yes! However, although the forces are equal and opposite, the acceleration isn't (f=ma); the truck has a higher mass, so the change in its acceleration is much less.

What is the difference between static and kinetic force?

Static opposes potential motion (v=0) and kinetic opposes motion (v is not 0)

What is the equation for the force of a spring, and what units does it have?

Fspring = -k * (change in x), where k = spring constant. Units are in N/m

What are the equations for conservation of energy?

Ki + Ui = Kf + Uf (and don't forget to plug in their equations...) and E = K + Ug + Us

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physics6a midterm

Question	Answer
When finding magnitude, or the x or y component of a magnitude, what is a good equation to remember?	Pythagorean theorem (think in triangles!) F^2 = Fx^2 + Fy^2
How do you find angle B if you know that tanB= y/x?	angle B = inverse tan(y/x)
When velocity is constant, what is the value for acceleration?	a=0 at constant v
What is the basic unit of force?	kg * m/s^2
Name 6 types of force.	Weight (Fg), Spring force (Fspring), Tension force (T), Normal force (N), Frictional force (f), Thrust (Fthrust)
What is Newton's first law?	A body at rest remains at rest; one in motion remains in motion at a constant velocity unless acted upon by a net external force
What is Newton's second law?	Force = mass x acceleration
What is Newton's third law?	When one body exerts a force on a second body, the first body experiences a force equal and opposite in direction.
What is an inertial reference frame, and do Newton's laws still apply within one?	It's a non-accelerating frame (when v=0 or is constant). Newton's laws work the same because there's no acceleration being acted; so a marble in an airplane going at constant velocity acts the same as if the airplane were at rest.
If a mosquito runs into a truck, does the mosquito exert the same amount of force on the truck as the truck does on the mosquito?	Yes! However, although the forces are equal and opposite, the acceleration isn't (f=ma); the truck has a higher mass, so the change in its acceleration is much less.
What is the difference between static and kinetic force?	Static opposes potential motion (v=0) and kinetic opposes motion (v is not 0)
In an equilibrium problem, what do the forces in all directions add up to?	They add to 0
What is the equation for the force of a spring, and what units does it have?	Fspring = -k * (change in x), where k = spring constant. Units are in N/m
What are the units of a Joule?	J = kg * m^2 / s^2
What are the equations for conservation of energy?	Ki + Ui = Kf + Uf (and don't forget to plug in their equations...) and E = K + Ug + Us
What are the units of a Watt?	W = J/s

Created by: clownestate

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