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OCR A Level P.E. (Anatomy, Physiology and Biomechanics) > Biomechanics Definitions > Flashcards

Biomechanics Definitions Flashcards

1
Q

Define force

A

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

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2
Q

Define inertia

A

The resistance of a body to change its state of motion, whether at rest or while moving

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3
Q

Define velocity

A

The rate of change in displacement

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4
Q

Define momentum

A

The quantity of motion possessed by a moving body

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5
Q

Define acceleration

A

The rate of change in velocity

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6
Q

Calculation and units for velocity

A

Velocity = displacement ÷ time taken
• measured in (m/s)

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7
Q

Calculation and units for momentum

A

Momentum = mass × velocity
• measured in (kg/s)

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8
Q

Calculation and units for acceleration

A

Acceleration = (final velocity - initial velocity) ÷ time taken
• units - m/s/s

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9
Q

Calculation and units for force/weight

A

Force = mass × acceleration
Units - N (Newtons)

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10
Q

Define net force

A

The sum of all forces acting on a body, also termed resultant force

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11
Q

Define weight

A

the gravitational pull that the earth exerts on a body

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12
Q

Give the calculation and units for weight

A

Weight = mass × acceleration due to gravity
• units - (N)

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13
Q

Define friction

A

The force that opposes the motion of two surfaces in contact

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14
Q

Define air resistance

A

The force that opposes the motion through the air

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15
Q

Define streamlining

A

The creation of smooth air flow around an aerodynamic shape to minimise air resistance

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16
Q

What is a free body diagram

A

A clearly labelled sketch showing all of the forces acting on a body at a particular instant in time

17
Q

Define reliability

A

The extent to which an experiment, test or measuring procedure gives the same results after repeated trials

18
Q

Define validity

A

How well a test measures what it claims to measure. It is important for a test to be valid in order for the results to be accurately applied and interpreted

19
Q

Define balanced force

A

When two or more forces acting on a body are equal in size and opposite in direction

20
Q

Define unbalanced force

A

When two forces are unequal in size and opposite in direction

OCR A Level P.E. (Anatomy, Physiology and Biomechanics) (31 decks)

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