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# Combining Forces

## The net force acting on an object is the combination of all of the individual forces acting on it.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
• Real World Application

## Ollie Up

by CK-12 //basic
Discover the physics behind the skateboarding trick called the ollie and how the skater combines forces to do the trick.
MEMORY METER
This indicates how strong in your memory this concept is
1
• Real World Application

## Tug of War

by CK-12 //basic
Learn what forces are involved in the game of tug of war and how the game illustrates Newton's first law of motion.
MEMORY METER
This indicates how strong in your memory this concept is
5
• Real World Application

## Speeding Up by Falling Down

by CK-12 //basic
Discover how to find the terminal velocity of a penny dropped from a skyscraper and whether the penny will be traveling fast enough by the time it reaches the ground to damage materials or harm people.
MEMORY METER
This indicates how strong in your memory this concept is
6