Mass determines the force of gravity like this:
If an object weight a lot it will affect the mass and gravity pulls on the object lots more when an object has lots of weight/mass.
Example: An airplane. An airplane probably weighs a ton. That is why gravity pushes it down in order for the plane to go down when it is landing or else it would be flying but never coming down. But the gravity pulling down the airplane is still there so the airplane has to be pulling the steer up in order for it to be heading straight.
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Light slows down when it goes into water (from 299 million m/s to 225 million m/s).
Answer:
type of surface
Explanation:
The independent variable is the variable that doesn't depend on anything else. The dependent variable would be the time in seconds because that depends on the independent variable which is the type of surface.
hope this helps :)
The second one because each element amount is equal on both sides
