BIOMECHANICS 1

Question 1

LINEAR MOTION

Answer 1

when a body moves in a straight or curved line, with all parts moving the same distance in the same direction at the same speed

Question 2

FORCE

Answer 2

a push or pull that alters, or tends to alter, the state of motion of a body (N)

Question 3

INTERIA

Answer 3

the resistance of a body to change its state of rest or motion

Question 4

VEOCTIY

Answer 4

the rate of motion in a particular direction. velocity = displacement / time (ms-1)

Question 5

MOMENTUM

Answer 5

the quantity of motion possessed by a moving body. momentum = mass x velocity (kg ms-1)

Question 6

ACCELERATION

Answer 6

the rate of change of velocity. acceleration = change in velocity / time (ms-2)

Question 7

ACTION FORCE

Answer 7

force exerted by a performer on another body

Question 8

REACTION FORCE

Answer 8

an equal and opposite force to the action force exerted by a second body on the first.

Question 9

MASS

Answer 9

the amount of matter or substance in a body

Question 10

DISTANCE

Answer 10

the path taken in moving from the first position to the second (m)

Question 11

DISPLACEMENT

Answer 11

the shortest straight-line route between two positions in a stated direction (m)

Question 12

SPEED

Answer 12

a body’s movement per unit time (m/s)

Question 13

DECELERATION

Answer 13

the rate of decrease I’m velocity. deceleration = change in negative acceleration / time (ms-2)

Question 14

LAW OF CONSERVATION OF MOMENTUM

Answer 14

in any system if bodies that exert forces on each other, the total momentum in any direction remains constant unless some external force acts on the system in that direction

Question 15

INTERNAL FORCE

Answer 15

force generated by the contraction of skeletal muscle

Question 16

EXTERNAL FORCE

Answer 16

force that comes from outside the body

Question 17

NET FORCE

Answer 17

the overall force acting on a body when all the individual forces have been considered (resultant force)

Question 18

STATICS

Answer 18

the study of bodies that are in a constant state of motion

Question 19

DYNAMICS

Answer 19

the study of bodies that are changing their state of motion

Question 20

BALANCED FORCES

Answer 20

when two or more forces acting on a body are equal in size but opposite in direction, resultant net force is zero

Question 21

UNBALANCED FORCES

Answer 21

when force acting in one direction is greater in size than the force acting in the opposite direction, resultant ret force is either positive or negative

Question 22

WEIGHT

Answer 22

force on a body exerted by the earths attraction (N)

Question 23

GRAVITIATIONAL FORCE

Answer 23

the force that attracts a body to the centre of the earth