Kinematic concepts of human movement

Question 1

Define general motion

Answer 1

General motion refers to motion involving translation and rotation at the same time.

Question 2

Define angular motion

Answer 2

angular motion refers to the movement of a body part around an axis of rotation.

Question 3

Define linear motion

Answer 3

Linear motion refers to movement that of the body where all parts move in the same direction all the same time along a line.

Question 4

Define linear displacement

Answer 4

linear displacement refers to the change of position - how far it is from initial starting position to the final position.

Question 5

Define linear distance

Answer 5

linear distance refers to the measurement of the path travelled from start to finish, regardless of direction.

Question 6

Define linear speed and velocity

Answer 6

Speed is defined as the ratio of the distance covered to the time taken. Speed = distance/time. Velocity refers to the ratio of displacement or change in position, to the time taken. Velocity = displacement/time.

Question 7

Define Linear acceleration

Answer 7

Linear acceleration refers to a change in velocity in a given period of time. It can be a positive or negative number. Measured in m/s (2). Acceleration = change in velocity/change in time.

Question 8

Define Torques

Answer 8

Angular motion is caused by an eccentric force, which is a force that does not act through an object’s centre of gravity. Eccentric forces cause objects to rotate and move forwards. Torque refers to the tendency of an object to rotate. It is calculated by multiplying the force by the lever arm of the force. Greater the torque, greater the angular acceleration. Size of the torque refers to the length of the lever arm and the size of the applied force.

Question 9

List the formula of linear velocity

Answer 9

The formula for linear velocity is radius of rotation x angular velocity.

Question 10

Define projectile motion

Answer 10

projectile motion refers to the movement of an object through the air. Looks at factors that influence the flight path of a projectile.

Question 11

Define the vertical component of projectile motion

Answer 11

the vertical component refers to influences by gravity and the vertical component of the initial projection velocity. Gravity is an example of a vertical component. It gives projectiles their parabolic flight path. The vertical component relates specifically to the height reached by the projectile.

Question 12

Define the horizontal component of projectile motion

Answer 12

The horizontal component refers to being affected by the resistance and relates to the horizontal distance covered by the projectile. Without air resistance, the horizontal velocity of a projectile would stay the same.

Question 13

List the factors that affect the path of a projectile

Answer 13

The factors include: angle of release, speed of release and the height of release.

Question 14

Define angle of release

Answer 14

Angle of release is the angle at which an object is projected into the air. Angle will determine the flight path of the projectile. It affects the horizontal distance covered.

Question 15

Define speed of release

Answer 15

Speed of release refers to the speed at which an object is thrown, kicked or propelled into the air. The greater speed of release, the greater the horizontal range of the projectile.

Question 16

Define the height of release

Answer 16

Height of release refers to the difference between the height that a projectile is released from and the height at which it lands or stops.