Kinematics

Question 1

What does kinematics describe?

Answer 1

The motion of bodies regardless of the causes (forces) and the medium

Question 2

What studies the causes of motion?

Answer 2

Dynamics

Question 3

What does it mean to describe the motion of a body?

Answer 3

Defining the equations through which it is possible to establish the position of a moving body with respect to a reference system at any time

Question 4

What is the trajectory?

Answer 4

Line described by a body during motion

Question 5

Example of known trajectories

Answer 5

Straight line
Parabolic motion
Circular motion

Question 6

What is a material point=

Answer 6

A body with a defined mass but small in size compared to the pace traveled

Question 7

Can a material point rotate on itself?

Answer 7

No, only translate

Question 8

What does the equation of motion express?

Answer 8

The relationship between the space traveled by a material point and the time needed

Question 9

Does the trajectory tell us anything about the type of motion of the material point?

Answer 9

No

Question 10

What is instantaneous speed?

Answer 10

The ratio between ^s and ^t

Question 11

What 2 components can the acceleration vector be decomposed into?

Answer 11

Tangential and perpendicular to the trajectory

Question 12

What is the tangential component trajectory of an acceleration vector due to?

Answer 12

Variations of the velocity magnitude, not its direction

Question 13

What does the perpendicular component of an acceleration vector due to?

Answer 13

The curvature of the trajectory (radius of curvature) and from velocity magnitude v

Question 14

What is the tangential component of the acceleration during uniform motion?

Answer 14

0

Question 15

What is the velocity during uniform linear motion?

Answer 15

Constant in both magnitude and direction

Question 16

What is decelerated motion?

Answer 16

Acceleration constant in magnitude but opposite direction with respect to motion

Question 17

What is the SI unit of frequency?

Answer 17

s^-1
Hz (hertz)

Question 18

What does static studie?

Answer 18

Conditions of equilibrium of bodies

Question 19

Where is the center of gravity on a man?

Answer 19

The second saccrual vertebra

Question 20

Why do quadrupeds have a much more stable balance?

Answer 20

Because the support base is much wider due to the 4 legs

Question 21

What is a fulcrum?

Answer 21

The thing which a rod rotates around in a lever

Question 22

What is required for the lever not to rotate around the fulcrum?

Answer 22

The total moment has to be 0

Question 23

What are the 3 types of levers?

Answer 23

1: fulcrum between effort and resistance
2: resistance between effort and fulcrum
3: effort between the fulcrum and resistance

Question 24

Examples of type 1 levers

Answer 24

Scissor
Atlanto-occipital joint

Question 25

Example of type 2 levers

Answer 25

Nutcracker
Standing on your toes

Question 26

What is the gain of type 2 levers?

Answer 26

Always greater than 1

Question 27

What is the gain of type 1 levers?

Answer 27

Either greater or less than 1

Question 28

What is the gain of type 3 levers?

Answer 28

Always less than 1

Question 29

Example of type 3 levers

Answer 29

Tweezers
The forearm (the elbow is the fulcrum)
Mandible

Question 30

What is energy defined as?

Answer 30

The ability of a body to perform work

Question 31

What is kinetic energy?

Answer 31

The energy an object acquires by virtue of its motion

Question 32

What is potential energy

Answer 32

Energy aquifer by virtue of the position of a body