Friction and gravity Friction and gravity How do

Friction and gravity:

Friction and gravity: How do gravity and friction affect space travel?

• It will be important today to write notes in your own words (DO NOT COPY WHAT YOU ARE ABOUT TO SEE WORD FOR WORD!!!!!!!)

• It will be important today to write notes in your own words (DO NOT COPY WHAT YOU ARE ABOUT TO SEE WORD FOR WORD!!!!!!!) • Copying word for word may make your head hurt!!!!!

• It will be important today to write notes in your own words (DO NOT COPY WHAT YOU ARE ABOUT TO SEE WORD FOR WORD!!!!!!!) • Copying word for word may make your head hurt!!!!! • Pictures will help!!!!!

Friction: • Friction:

Friction: • Friction: The force that resists relative motion between two objects whose surfaces are in contact.

Types of Friction: • Static friction:

Types of Friction: • Static friction: The force that resist motion as outside forces try to force two objects to slide across one another.

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Types of Friction: • Static friction: The force that resist motion as outside forces try to force two objects to slide across one another. • Sliding friction:

Types of Friction: • Static friction: The force that resist motion as outside forces try to force two objects to slide across one another. • Sliding friction: The force that works to stop two objects from moving across one another once they are moving.

Types of Friction: • Traction:

Types of Friction: • Traction: The largest amount of frictional force that an object can get from another object.

Gravity: • Gravity:

Gravity: • Gravity: The attractive forces between every pair of objects in the universe.

Gravity: • Gravity: The attractive forces between every pair of objects in the universe. – An object’s gravitational force is trying to pull every other object to its center.

Gravity: • Mass:

Gravity: • Mass: A measure of the amount of material (stuff) an object contains.

Gravity: • Mass: A measure of the amount of material (stuff) an object contains. – Mass is what causes an object to have weight in the presence of a gravitational field.

Gravity: • Weight:

Gravity: • Weight: The downward force on an object due to a gravitational force.

Friction and Gravity: • Less gravity means less weight.

Friction and Gravity: • Less gravity means less weight. • Less weight means friction is affected.

• Earth 100 lbs.

• • • Earth Moon Mercury Venus Mars Jupiter Saturn Uranus Neptune Pluto SUN 100 lbs. 16. 6 lbs. 37. 8 lbs. 90. 7 lbs. 37. 7 lbs. 236. 4 lbs. 106. 4 lbs. 88. 9 lbs. 112. 5 lbs. 6. 7 lbs. 2, 750 lbs.