newtons laws of motion

Question 1

what are newtons 3 laws

Answer 1

1st: Law of Inertia
2nd: Law of Acceleration
3rd: Law of Action-Reaction

Question 2

state newtons first law

Answer 2

Every body continues in its state of rest, or uniform motion in a
straight line, unless it is compelled to change that state by
external forces applied upon it.

Question 3

what is inertia

Answer 3

Inertia is the resistance of a body to a change in its motion (i.e.
an object’s resistance to a change in velocity).

Question 4

what is linear momentum

Answer 4

Linear Momentum (p) is the object’s mass (m) multiplied by its
linear velocity (v)
units are kg.m/s
p=mv

Question 5

state newtons second law

Answer 5

External forces cause acceleration
– If an object accelerates then a net external force must be acting on
the object
Force = mass x acceleration

Question 6

what does insertion mean

Answer 6

muscle attachment that moves
most (smaller mass), generally more distal

Question 7

what does origin mean

Answer 7

muscle attachment that moves least
(greater mass), generally more proximal.

Question 8

example via bicep curl

Answer 8

Biceps brachii contracts (concentric)
Radius (insertion) pulled upwards.
Little movement of scapula (origin)
Major action is elbow flexion

Question 9

state newtons 3rd law

Answer 9

“to every action there is an equal yet opposite reaction”
If object A exerts a force on another object B, then object B exerts the
same force on object A but in the opposite direction

Question 10

example via running

Answer 10

Running: person exerts an
action force on the ground,
whilst the ground exerts a
‘reaction force’ on the person

If the ground reaction force is
greater than the persons body
weight then they will
accelerate upwards