In the investigation with a ping pong ball, when a person blows through a straw at the ball, the ball moves in the direction of the blown air. This demonstrates which principle of forces?
1 )
Forces always cause objects to move in the opposite direction
The direction of motion is the same as the direction of the applied force
3 )
Stationary objects require multiple forces to begin moving
4 )
The size of the force determines the speed of motion but not the direction
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