Solve the following problems. Show your work with your answers.
v = d/t a = ∆v/t Δv = vf – vi p = m*v F = m*a g = 9.8 m/s2 Weight=m*g
CALCULATE THE FOLLOWING – SHOW YOUR WORK!!
Free fall is when gravity is the only force on an object. In the real world falling objects also have air resistance (a type of friction) on them, but this force is so small that it can often be ignored.
g = acceleration due to gravity on Earth = 9.8 m/s2
This value can be used in place of a in our force and acceleration equations. If there was no such thing as air resistance, all falling objects would strike the ground at the exact same time. Even a feather and hammer as astronauts tested on the moon in the video below.
Weight Vs. Mass
In our everyday language these words are often used to mean the same thing, however their real meanings are different. Mass is a measure of the amount of matter in an object and never changes. The SI unit for mass is kg. Weight is the force on a object due to gravity. The SI unit for weight is newtons because it is a force. Weight can be calculated using the following equation:
Weight = m * g
This is just a variation of Newton’s second law using a specific force and a specific acceleration. Weight changes depending on the gravitational force. This is different on each planet due to their differences in mass.
Click HERE to discover what your weight would be on different planets. Where would you be the heaviest? The lightest?
Since there is no where on Earth where we can escape Earth’s gravitational pull, we know that even when we feel weightless, like on a big drop on a roller coaster, we do still have weight. Apparent weightlessness occurs when your body is falling downwards at 9.8 m/s2.
Click HERE to read some information and do some activities to explain the differences between free fall and apparent weightlessness.
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