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Pe Year 2 Section A > Linear Motion > Flashcards

Linear Motion Flashcards

1
Q

What are the 2 types of force

A

External and internal force

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2
Q

Define external force

A

Comes from outside the body

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3
Q

Define internal force

A

Is generated by skeletal muscles

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4
Q

Example of an internal force

A

Force generated as quadriceps contract concentrically to extend the knee to jump

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5
Q

Example of external force

A

Friction, air resistance and weight

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6
Q

What are the 2 vertical forces

A

Weight
Reaction force

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7
Q

How does weight affect force

A

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

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8
Q

Define reaction force

A

Occurs when two bodies are in contact with one another

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9
Q

What are 2 horizontal forces

A

Frictional force and air resistance

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10
Q

What are the 2 types of frictional force

A

Static
Sliding

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11
Q

Define static friction

A

Is the force exerted on one surface by another when there’s no motion between the 2 surfaces

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12
Q

Factors affecting friction

A

–Surface characteristics of 2 bodies in contact
–Temperature of 2 surfaces in contact
–Mass of objects that are sliding

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13
Q

How does Surface characteristics of 2 bodies in contact affect friction

A

100m Sprinter wearing spikes. Helps to increase friction as spikes make contact with track which maximises acceleration

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14
Q

How does temp of 2 surfaces in contact affect friction

A

In curling, ice is swept in front of curling stone. Sweeping action slightly raises surface temp of ice, reducing friction

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15
Q

How does mass of objects sliding affect friction

A

A large mass results in greater friction

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16
Q

Define air resistance

A

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

17
Q

What does air resistance depend on

A

–Velocity of moving body
–The cross sectional area of moving body
–Shape and surface characteristics of a moving body

18
Q

How does velocity of moving body affect air resistance

A

Faster the performer moves, the greater the air resistance

19
Q

How does the cross sectional area of moving body affect air resistance

A

The larger the cross sectional area, the greater the air resistance e.g. cyclists crouch low over handlebars rather than sit upright

20
Q

How does shape and surface characteristics of a moving body affect air resistance

A

A streamlined shape results in less resistance, as does a smooth surface e.g. professional swimmers shave body hair for smooth surface

21
Q

Formula for acceleration

A

Time

Pe Year 2 Section A (6 decks)

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