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2 - P.E - Biomechanical Movement❌ > ✅Forces Acting During Linear Motion > Flashcards

✅Forces Acting During Linear Motion Flashcards

1
Q

What are the types of force?

A

Internal force

External force

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2
Q

What is an internal force?

A

Applied when our skeletal muscles contract

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3
Q

What’s an example of an internal force?

A

The force generated as the quads contract concentrically to extend the knee in a jump.

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4
Q

What is an external force?

A

Comes from the outside of the body

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5
Q

What are examples of an external force?

A

Friction
Air resistance
Weight

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6
Q

What is weight and gravity?

A

Weight is a gravitational force that the earth exerts on a body, pulling it towards the centre of the earth.

The greater the mass of the body, the greater the weight force pulling it downwards

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7
Q

What is friction?

A

It acts as opposition to motion

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8
Q

What are the types of friction?

A

Static

Sliding

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9
Q

What can friction be affects by?

A

The surface characteristics of the two bodies in contact

The temperature of the two surfaces in contact

The mass of the objects that are sliding

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10
Q

What is the surface characteristics of the two bodies in contact?

A

Think of a 100 metre sprinter who wears running spikes.

These help to increase friction, as the spikes make contact with the track and therefore maximise acceleration.

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11
Q

What is the temperature of the two surfaces in contact?

A

In curling, for example, the ice is swept in front of the curling stone.

The sweeping action slightly raises the surface temp of the ice, which reduces the friction between the stone and the ice, allowing the stone to travel further.

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12
Q

What is the mass of the objects that are sliding?

A

A larger mass results in greater friction

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13
Q

What is air resistance?

A

Opposes the motion of a body travelling through the air

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14
Q

What does air resistance depend on?

A

The velocity of the moving body
The cross-sectional area of the moving body
The shape and the surface characteristics of a moving body

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15
Q

What is the velocity of the moving body? (AR)

A

The faster the performer moves, the greater the air resistance

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16
Q

What is the cross-sectional area of the moving body?

A

The larger it is, the greater the air resistance

Cyclists crouch low

17
Q

What is the shape and the surface characteristics of a moving body?

A

A streamlined shape results in less air resistance, as does a smooth surface.

E.g. most swimmers shave or wear a cap

2 - P.E - Biomechanical Movement❌ (8 decks)

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