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PE - Biomechanics > Forces > Flashcards

Forces Flashcards

1
Q

What is an external force ?

A
  • Comes from outside the body
  • E.g. friction, air resistance, weight, reaction force
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2
Q

What is an internal force ?

A
  • A force produced by skeletal muscle
  • E.g. contracting the quadriceps to extend the knee in a jump
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3
Q

What are two different types of vertical force known as ?

A

Weight
Reaction force

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4
Q

What is weight ?

A

Mass * acceleration

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5
Q

What is Reaction force ?

A

The force where two bodies are in contact with one another
E.g kicking a football

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6
Q

What is a horizontal force ?

A

Friction

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7
Q

What are the two types of frictional force ?

A

Static
Sliding

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8
Q

What is a static force ?

A

Friction between two surfaces with no movement

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9
Q

What is a sliding force ?

A

Friction between two surfaces when there is movement
E.g. curling

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10
Q

What are key areas which effect air resistance ?

A
  • Higher velocity = higher air resistance
  • The larger the area of body, the larger the air resistance
  • Shape and characteristics determine air resistance
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11
Q

What is air resistance ?

A

A force that acts in the opposite direction to the motion of a body travelling through the air

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12
Q

How is weight force drawn on a free body diagram ?

A

Drawn downwards arrow from the centre of mass

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13
Q

How is the reaction force drawn on a free body diagram ?

A

Start from where the two bodies are in contact

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14
Q

How do you draw friction force on a free body diagram ?

A
  • Starts where two bodies are in contact
  • Opposite to potential slipping
  • Drawn in same direction as motion
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15
Q

How do you draw air resistance on a free body diagram ?

A

Drawn from the centre of mass away from the direction of motion

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16
Q

What is netforce ?

A

Overall force on a body when all forces have been considered

17
Q

What is a balanced force ?

A

When all forces acting on a body are equal

18
Q

What is an unbalanced force ?

A

When a force acting in one direction is bigger than the force acting in the opposite direction
E.g Jumping in the air

19
Q

What does it mean if friction and air resistance are equal ?

A

Someone is moving at a constant speed

20
Q

What does it mean if friction is bigger than air resistance ?

A

Acceleration is happening

21
Q

What does it mean if air resistance is bigger than friction ?

A

Deceleration is happening

PE - Biomechanics (9 decks)

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