) ions). Average density at the surface is 1.025 kg/l. Seawater is denser than both fresh water and pure water (density 1.0 kg/l at 4 Â°C (39 Â°F)) because the dissolved salts increase the mass by a larger proportion than the volume. The freezing point of seawater decreases as salt concentration increases. At typical salinity, it freezes at about â2 Â°C (28 Â°F).
How does air resistance affect the acceleration of a falling object? As a falling object accelerates through air, its speed increases and air resistance increases. While gravity pulls the object down, we find that air resistance is trying t â¦ o limit the object's speed. Air resistance reduces the acceleration of a falling object. It would accelerate faster if it was falling in a vacuum.
Specifically, gravity increases a falling object's velocity by 9.8 meters per second (m/s) with every passing second. (Whereas velocity is measured in m/s, acceleration is measured in meters per second squared, or m/s 2 .) How does this constant acceleration affect the distance that an object travels over time?In this experiment you will roll a marble down a ramp to find out. Mark the distance traveled on the ramp each time. 2  Using a longer ramp, how does gravity appear to affect the velocity and acceleration of a marble as it rolls downhill? 3  Extra: Try repeating this activity with different balls, such as a rubber ball, large metal ball bearing, ping pong ball, etc.