Forces and Thier Measurements

Question 1

Force

Answer 1

effect that one body has on another

Question 2

Internal force

Answer 2

within the system

Question 3

external force

Answer 3

outside of the system

Question 4

is force a scalar or vector?

Answer 4

vector (magnitude and direction)

Question 5

point of application of force

Answer 5

necessry for determining moments and torques

Question 6

Pressure

Answer 6

Force/area
force is distributed “force per cross sectional area”

Question 7

Newtons 1st law

Answer 7

Intertia

Question 8

Newtons 2nd law

Answer 8

F=ma

Question 9

newtons 3rd law

Answer 9

action reaction

Question 10

free body diagram

Answer 10

all external forces acting on the body

Question 11

GRF

Answer 11

Ground Reaction Force
with no movement = to mass
GRF-W = ma

Question 12

Positive Acceleration

Answer 12

increasing V - upward direction
decreasing velocity - downward direction
change direction from down to up

Question 13

negative acceleration

Answer 13

decreasing V in upward Direction
increasing v in down direction
changing direction from up to down

Question 14

zero acceleration

Answer 14

constant v
peak v

Question 15

What does this graph and A and B represent?

Answer 15

Walking GRF - double bump
A weight acceptance
B. push off

Question 16

Answer 16

Running GRF

Question 17

In a biphasic wave what indicates velocity?

Answer 17

Slope of the line

Question 18

What does friction do?

Answer 18

opposes the tendency to move
Ffriction=coefficient of friction * Normal reaction force.

Question 19

In which direction does normal force exert its influence?

Answer 19

perpendicular to surface

Question 20

As friction increases

Answer 20

force increases and vice versa

Question 21

Cause of angular motion

Answer 21

eccentric force

Question 22

centric force

Answer 22

-linear motion only
-line of action passes through objects COM

Question 23

force couple

Answer 23

-angular motion only
-force with a resultant moment but no resultant force

Question 24

eccentric force

Answer 24

general motion (linear/angular)

Question 25

Torque

Answer 25

Moment of force: turning effect, cause of angular motion

Question 26

moment arm

Answer 26

perpendicular distance from the axis of rotation to the line of action.

changes as angle changes

Question 27

Newtons laws of angular motion

Answer 27

law of angular inertia t=rotating body continues to rotate
law of angular acceleration T=la torque equals product of moment of inertia and angular acceleration
law of angular reaction T12=f12*d for every torque equal but opposite torque

Question 28

A in Static equilibrium

Answer 28

No acceleration,

Question 29

dynamic equilibrium

Answer 29

Inertial forces

Question 30

Impulse

Answer 30

Cause of change in momentum

Question 31

Impulse momentum relationship

Answer 31

accounts for force and duration of force applied

Question 32

how does segmental momentum relate to total body momentum?

Answer 32

segments are summed to find total body momentum

Question 33

sum of all momentums

Answer 33

total momentum of a system

Question 34

if force is zero what is acceleration?

Answer 34

zero

Question 35

what is momentum without impulse?

Answer 35

unchanged

Question 36

giving impulse examples

Answer 36

batting
throwing