linear, angular motion

Question 1

what is linear motion

Answer 1

results from a direct force being applied to the centre of an objects mass. The objects centre of mass is moving in a straight line or a curved line.

Question 2

what are examples of linear motion in sport

Answer 2

100m sprint, 400m running

Question 3

what are the two measurements in linear motion

Answer 3

scalar, vector

Question 4

what is a scalar

Answer 4

has a magnitude and not concerned with direction. (size, amount)

Question 5

what are examples of scalars and how are they calculated

Answer 5

speed-m/s, distance divided by time
power- watts, work done divided by time taken

Question 6

what is a vector

Answer 6

has magnitude and direction

Question 7

what are examples of vector and how are they calculated

Answer 7

Weight
Velocity- size and direction, calculated by displacement divided by time.

Question 8

what is displacement and what is it measured in

Answer 8

how far you have moved from where you have started, in a straight line and a given direction.
Newtons- e.g. 10Nnorth/south

Question 9

what is speed

Answer 9

is the rate of change of distance, scalar quantity because it does not consider direction.
Speed=distance/time

Question 10

what is velocity

Answer 10

is the rate of change of displacement.
Velocity=displacement/time

Question 11

what is acceleration

Answer 11

when velocity increases

Question 12

how is acceleration calculated

Answer 12

acceleration(m/s2)= final velocity(m/s)- initial velocity

Question 13

what is deceleration

Answer 13

when velocity decreases over time or is a negative

Question 14

what is angular motion

Answer 14

is movement around a fixed point or axis

Question 15

when does angular motion occur

Answer 15

angular motion occur when a force is applied outside the center of mass
an off center force is referred to as an eccentric force

Question 16

what are the axis of rotation

Answer 16

transverse plane=vertical axis
frontal plane= sagittal axis
sagittal plane= frontal axis

Question 17

what is torque

Answer 17

is a rotational force, it causes an object to turn about its axis of rotation

Question 18

what is angular velocity and how is it calculated

Answer 18

-the speed of rotation
-the angular displacement that is covered in a certain time
- angular velocity(rad s2)=angular displacement (rad)/ time taken (s)

Question 19

is angular velocity a vector or a scalar quantity

Answer 19

vector and is makes reference to direction

Question 20

what is angular displacement

Answer 20

distance that you have rotated

Question 21

what is moment of inertia

Answer 21

is their resisitance of a body to angular motion

Question 22

what is inertia

Answer 22

is a resistance to change in linear motion

Question 23

what does high/ low moment of inertia result in

Answer 23

high moment= less rotation
low moment=more rotation

Question 24

how is moment of inertia calculated

Answer 24

MOI (kgm2)=mass (kg) X distribution of mass from he axis (m2)

Question 25

what things affect moment of inertia

Answer 25

-mass of object/body- the greater the mass the greater the resistance to change nd therefore the greater the moment of inertia. -distribution of mass from the axis of rotation- the closer the mass of the axis of rotation, the easier it is to turn so the moment of inertia is low. -angular velocity- he speed of your rotation

Question 26

what is angular momentum

Answer 26

is the quantity of angular motion that an object/ body has

Question 27

what does angular momentum involve

Answer 27

involves an object or body in motion around an axis, it depends upon the moment of inertia and angular velocity.

Question 28

how is angular momentum calculated

Answer 28

angular momentum (kgm2 rad/s= MOI (kgm2) X angular velocity (rad/s)

Question 29

what is conservation of angular momentum

Answer 29

angular momentum is conserved unless an external torque acts upon it