Biomechanics

Question 1

Define law of inertia

Answer 1

A body continues in a state of rest or uniform velocity unless acted upon by an external or unbalanced force

Question 2

Define law of acceleration

Answer 2

Body’s rate of acceleration is directly proportional to the size and the direction of the force applied

Question 3

Define law of reaction

Answer 3

For every action force, there is an equal and opposite reaction force

Question 4

What is Newton’s first law?

Answer 4

Law of inertia

Question 5

What is Newton’s second law?

Answer 5

Law of acceleration

Question 6

What is Newton’s third law?

Answer 6

Law of reaction

Question 7

Which law is law of inertia?

Answer 7

Newton’s first law

Question 8

Which law is law of reaction?

Answer 8

Newton’s third law

Question 9

Which law is law of acceleration?

Answer 9

Newton’s second law

Question 10

What’s the equation for velocity?
M/S

Answer 10

Velocity = displacement / time

Question 11

What is velocity?

Answer 11

Rate of change in displacement

Question 12

What do you call the rate of change in displacement?

Answer 12

Velocity

Question 13

What is momentum?

Answer 13

The quantity of motion possessed by a moving body

Question 14

what is momentum measured in?

Answer 14

Kgm/s

Question 15

how do you calculate momentum?

Answer 15

momentum = mass X velocity

Question 16

what is acceleration?

Answer 16

rate of change in velocity

Question 17

what is acceleration measured in?

Answer 17

m/s/s or m/s²

Question 18

how do you calculate acceleration?

Answer 18

(final velocity - initial velocity) / time taken

Question 19

what is force?

Answer 19

push or pull that alters the state of motion of a body

Question 20

what is force measured in?

Answer 20

Newtons

Question 21

how do you calculate force?

Answer 21

force = mass X acceleration

Question 22

what is an internal force?

Answer 22

a force that is generated by contraction of skeletal muscle

Question 23

what is an external force?

Answer 23

a force that comes from outside the body

Question 24

what do you call a force that is generated by the contraction of skeletal muscle?

Answer 24

internal force

Question 25

what do you call a force that is generated by something outside the body?

Answer 25

external force

Question 26

what do we also call the net force?

Answer 26

resultant force

Question 27

what is net force?

Answer 27

the sum of all forces acting on a body when all individual forces have been considered

Question 28

when would the net force of a body be 0?

Answer 28

when it is at a constant velocity or at rest

Question 29

what is a positive force?

Answer 29

acceleration

Question 30

what is a negative force?

Answer 30

deceleration

Question 31

what can forces do?

Answer 31

create motion cause acceleration cause deceleration change direction change shape

Question 32

what is the definition of weight?

Answer 32

the gravitational pull that Earth exerts on a body and is measured in Newtons

Question 33

what is weight measured in?

Answer 33

Newtons

Question 34

how do you calculate weight?

Answer 34

weight = mass X acceleration N = Kg X m/s/s

Question 35

what is reaction force?

Answer 35

equal and opposite force exerted by a body in response to the action force placed upon it

Question 36

in what direction does reaction force act?

Answer 36

it always acts upwards vertically

Question 37

what are the vertical forces?

Answer 37

weight reaction force

Question 38

what are the horizontal forces?

Answer 38

friction air resistance

Question 39

what is friction measured in?

Answer 39

Newtons

Question 40

what is friction?

Answer 40

friction occurs when 2 surfaces slide over each other acts in the opposite direction to motion acts parallel to the 2 surfaces in contact drawn in the same direction as the motion

Question 41

what factors impact friction?

Answer 41

roughness temperature size of reaction

Question 42

what is air resistance measured in?

Answer 42

Newtons

Question 43

what is air resistance?

Answer 43

the forces that oppose motion of a body travelling through the air it is a form of fluid friction measured in Newtons

Question 44

which factors impact air resistance?

Answer 44

-velocity -shape -frontal cross sectional area -smoothness of the surface

Question 45

when do you get a balanced force?

Answer 45

when the net force of a body is 0

Question 46

what is a sporting example of a balanced force?

Answer 46

a football on a penalty spot before the force of it being kicked is applied