Kinematics and Dynamics

Question 1

Gravitational force

Answer 1

F_{g =} Gm₁m₂ / 2

G = 7.0 x 10^-11

Question 2

Static friction

Answer 2

exists between a stationary object and the surface upon which it rests.

f_s = µ_sN

• can be a range of numbers, but static friction must be greater than or equal to zero

Question 3

Kinetic friction

Answer 3

Exists between a sliding object and the surface over which the object slides.

f_k = µ_kN

Kinetic coefficient is always smaller than the static coefficient.

Question 4

Mass

Answer 4

measure of a body’s inertia

More mass, more inertia

Question 5

Weight

Answer 5

measure of gravitational force on an objects mass

Question 6

Centripetal force

Answer 6

F_c = mv² / r

Question 7

Rotational motion

Answer 7

Occurs when forces are applied against an object in such a way as to cause the object to rotate around a fixed pivot point.

Torque = r x F = rFsinØ

equilibrium is reached when the vector sum of all torques acting on an object is zero.

T_cw = T_ccw