Kinetics and Dynamics

Question 1

What is 1 Newton equal to? What makes up 1 N?

Answer 1

1 kg * m/s^2

Question 2

What makes up 1 Joule(J)?

Answer 2

1 kg * m^2/s^2

Question 3

What makes up 1 Watt(W)?

Answer 3

1 kg * m^2/s^3

Question 4

What is the equation for Gravitational Force?

Answer 4

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

Question 5

What are the two types of friction and the difference between the two?

Answer 5

Static friction: friction when two objects in contact are still
Kinetic friction: friction when two objects are in motion

Question 6

Which type of friction is bigger between Kinetic and Static friction?

Answer 6

Static.

Question 7

In which direction does the friction force point to?

Answer 7

opposite of applied force, direction of acceleration

Question 8

What is the acceleration when amount of Force is constant?

Answer 8

0 for acceleration and Velocity is constant

Question 9

What is Newton’s first law?

Answer 9

Law of Inertia. Unless net force is nonzero, Velocity will be constant

Question 10

What is Newton’s second law?

Answer 10

Any acceleration is the result of the sum of the forces

Question 11

What is the Newton’s third law?

Answer 11

Action Reaction.

Question 12

What are the four equations used in Linear motion?

Answer 12

Vf = Vi + at
X = Vi(t) + 1/2(at^2)
Vf^2 = Vi^2 + 2ax
d = rt or x = vt

Question 13

What is Vi and Vf in free fall?

Answer 13

Vi = 0 m/s
Vf = when "A" hits the ground

Question 14

What is Vi and Vf in “Ball throw upwards”?

Answer 14

Vf = 0 m/s
Vi = When "A" leaves the hand

Question 15

What is the acceleration that an object experiences?

Answer 15

Only Acceleration in Linear motion and Ball throw:

a = g = -10m/s^2

Question 16

What are the 2 types of Projectile motion?

Answer 16

No angle given(cliff to ground)
Angle given(ground to sky to ground)

Question 17

What are the three equations used for projectile motion questions?

Answer 17

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

Question 18

What is the acceleration of x component? y component?

Answer 18

a(x) = 0 m/s^2
a(y) = -10 m/s^2
* For the time floating in air, use vertical equations

Question 19

How to calculate x component of initial velocity(Vi)? y component?

Answer 19

Vi(x) = Vi * cos θ
Vi(y) = Vi * sin θ

Question 20

Explain why Vf(x) and Vf(y) are different after a ball has been projected in air

Answer 20

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.

Question 21

What is translational equilibrium?

Answer 21

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

Question 22

What is Centripetal force(Fc)? Centrifugal force?

Answer 22

Force toward the center. Force away from the center.

Question 23

In which direction is Fc compared to Centripetal acceleration?

Answer 23

same direction

Question 24

What is the equation for Fc?

Answer 24

Fc = mv^2/r
F = ma
a = v^2/r

Question 25

Eq for Circumference in terms of radius?

Answer 25

2(pi)r

Question 26

Which force will oppose Centripetal force?

Answer 26

Friction force

Question 27

What is Rotational equilibrium and equation for Torque?

Answer 27

Rotational equilibrium is when an object feels same rotational force so it is not spinning.
Torque(τ) = rF sin θ