# P3

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What do all objects fall with? Why?
The same acceleration due to gravity
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What does the size of the air resistance force on a falling object depend upon? (2 things)
1-Its cross sectional area- the larger the area the greater the air resistance, 2- its speed- the faster it falls the greater the air resistance
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When does air resistance have a significant effect on motion?
When it is large compared to the weight of the falling object
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What is the force on each kilogram of mass due to gravity?
g=10 N/kg
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What are three features of the gravitational field strength?
1- It's unaffected by atmospheric conditions, 2- varies with position on the Earth's surface, 3- Varies with height above or depth below Earth's surface
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What is the formula for gravitational potential energy?
GPE=mgh (m=mass, h=vertical height moved and g=gravitational field strength)
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What happens when skydivers reach terminal speed?
Their kinetic energy has a maximum value and remains constant
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When terminal speed is reached what can it be shown as?
change in GPE= work done against friction
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## Other cards in this set

### Card 2

#### Front

What does the size of the air resistance force on a falling object depend upon? (2 things)

#### Back

1-Its cross sectional area- the larger the area the greater the air resistance, 2- its speed- the faster it falls the greater the air resistance

### Card 3

#### Front

When does air resistance have a significant effect on motion?

### Card 4

#### Front

What is the force on each kilogram of mass due to gravity?

### Card 5

#### Front

What are three features of the gravitational field strength?