Kinetics and Dynamics Flashcards
What is 1 Newton equal to? What makes up 1 N?
1 kg * m/s^2
What makes up 1 Joule(J)?
1 kg * m^2/s^2
What makes up 1 Watt(W)?
1 kg * m^2/s^3
What is the equation for Gravitational Force?
Fg = Gm1m2/r^2
G: 6.67 x 10^-11 N * m^2/kg^2
m: in kg
r: distance between centers of the two matters
What are the two types of friction and the difference between the two?
Static friction: friction when two objects in contact are still
Kinetic friction: friction when two objects are in motion
Which type of friction is bigger between Kinetic and Static friction?
Static.
In which direction does the friction force point to?
opposite of applied force, direction of acceleration
What is the acceleration when amount of Force is constant?
0 for acceleration and Velocity is constant
What is Newton’s first law?
Law of Inertia. Unless net force is nonzero, Velocity will be constant
What is Newton’s second law?
Any acceleration is the result of the sum of the forces
What is the Newton’s third law?
Action Reaction.
What are the four equations used in Linear motion?
Vf = Vi + at X = Vi(t) + 1/2(at^2) Vf^2 = Vi^2 + 2ax d = rt or x = vt
What is Vi and Vf in free fall?
Vi = 0 m/s Vf = when "A" hits the ground
What is Vi and Vf in “Ball throw upwards”?
Vf = 0 m/s Vi = When "A" leaves the hand
What is the acceleration that an object experiences?
Only Acceleration in Linear motion and Ball throw:
a = g = -10m/s^2
What are the 2 types of Projectile motion?
No angle given(cliff to ground) Angle given(ground to sky to ground)
What are the three equations used for projectile motion questions?
d = Vi(t) + 1/2(at^2)
Vf = Vi + at
Vf^2 = Vi^2 + 2ad
*d is changed to either x or y depending on which components you look for
What is the acceleration of x component? y component?
a(x) = 0 m/s^2
a(y) = -10 m/s^2
* For the time floating in air, use vertical equations
How to calculate x component of initial velocity(Vi)? y component?
Vi(x) = Vi * cos θ Vi(y) = Vi * sin θ
Explain why Vf(x) and Vf(y) are different after a ball has been projected in air
for x component, a(x) stays the same = 0m/s^2, so Vf(x) is the same as Vf(i).
for y component, a(y) is constant with -9.8 m/s^2, this means Velocity is constantly changing; specifically 9.8m/s every second.
What is translational equilibrium?
Net force direction = acceleration direction
No acceleration = No net force(constant velocity)
F(net) = Force in direction of acceleration - Force that opposes it
Set up two different equations for two objects
What is Centripetal force(Fc)? Centrifugal force?
Force toward the center. Force away from the center.
In which direction is Fc compared to Centripetal acceleration?
same direction
What is the equation for Fc?
Fc = mv^2/r F = ma a = v^2/r
Eq for Circumference in terms of radius?
2(pi)r
Which force will oppose Centripetal force?
Friction force
What is Rotational equilibrium and equation for Torque?
Rotational equilibrium is when an object feels same rotational force so it is not spinning.
Torque(τ) = rF sin θ
