Wk 4 - Linear Kinetics

Question 1

_______ is defined as any interaction, a push or pull b/w 2 objects

Answer 1

Force

Question 2

______ is what causes something to move

Answer 2

Kinetics

Question 3

______ describes how something moves

Answer 3

Kinematics

Question 4

Are forces vector or scalar quantities?

Answer 4

Vector (both magnitude and direction)

Question 5

Forces can ______ motion, ______ motion, ______ or ______ in direction

Answer 5

produce motion, stop motion, positive or negative acc or change in direction

Question 6

Units of measurement for force is…?

Answer 6

Newton (N)

Question 7

Vectors - use arrows: length indicates _____ of force

Answer 7

magnitude

Question 8

Vectors - use arrows: arrow head indicates _____ of force

Answer 8

direction

Question 9

magnitude =

Answer 9

Amount of force applied

Question 10

straight line of infinite length in direction of acting force is the…?

Answer 10

Line of application

Question 11

orientation of the line of application gives an ang position which is the …?

Answer 11

Angle of application

Question 12

a force, velocity, or other vector quantity which is equivalent to the combined effect of two or more component vectors acting at the same point is called a …?

Answer 12

resultant

Question 13

____ ____ is defined to compose or resolve in which there are multiple forces?

Answer 13

Force systems

Question 14

Force systems acting in a single plane is called _____

Answer 14

coplanar

Question 15

Force systems acting at a single point is called _____

Answer 15

Concurrent

Question 16

Force system of vectors acting along a single line is called a _____

Answer 16

Collinear

Question 17

Force system which breaks force into its components with respect to the coordinate system is called _____

Answer 17

the resolution

Question 18

What is Newtons 1st Law?

Answer 18

The law of inertia

Question 19

The law of inertia is…

Answer 19

‘A body will maintain a state of rest or constant velocity unless
acted on by an (a NET) external force that changes the state’ of
motion

Question 20

Inertia is defined by…?

Answer 20

Reluctance to change state of rest or motion

Question 21

The _____ the mass, the ____ the inertia = harder to move object

Answer 21

greater

Question 22

Newtons 2nd Law is the …?

Answer 22

Law of acceleration

Question 23

Any time you increase or decrease speed it is…?

Answer 23

Accelertion/deceleration

Question 24

Force = ____ x ____

Answer 24

Force = mass x acceleration

Question 25

Acceleration = ___ x ___

Answer 25

Acc = vel / time

Question 26

______ is a quantity of motion of an object

Answer 26

momentum

Question 27

p or m stand for

Answer 27

momentum

Question 28

momentum (p) = ____ x ____

Answer 28

p = mass x vel

Question 29

Newton's 3rd law is ...

Answer 29

The law of reaction

Question 30

The law of reaction (3rd law) means...

Answer 30

For each action (force) there is an equal and opposite reaction (force)

Question 31

What is a non contact force?

Answer 31

Acts at a distance, not directly in contact with each other (e.g. gravity)

Question 32

Which law is this: 'All bodies are attracted to one another with a force proportional to the product of their masses and inversely proportional to the distance between them'

Answer 32

The law of gravitation

Question 33

What affects the law of gravitation ? (2)

Answer 33

Distance between the two and mass

Question 34

The higher the altitude the _____ the gravity

Answer 34

Lower

Question 35

Contact forces are

Answer 35

exerted by one object in direct contact with another object

Question 36

The max vertical GRF in walking is ...

Answer 36

1-1.3 of body weight

Question 37

The max vertical GRF in running is...

Answer 37

3-5 body weight

Question 38

______ is a contact force acting parallel to the interface of 2 surfaces

Answer 38

friction

Question 39

Doe friction always oppose motion?

Answer 39

Yes

Question 40

The objects not moving has friction preventing it from moving...

Answer 40

Static friction

Question 41

The object is moving but there are still forces trying to oppose the motion

Answer 41

Max static friction

Question 42

μ means...

Answer 42

the coefficient of friction

Question 43

Once the object is sliding, the frictional force opposing it is ____ than what it was before it started moving

Answer 43

less

Question 44

Friction can be change by ...?

Answer 44

altering both surfaces

Question 45

Is friction related to the area of contact?

Answer 45

No. only roughness

Question 46

Can forces be present without motion?

Answer 46

Yes