Starter Galileo Galilei was an Italian physicist, mathematician, engineer, astronomer, and philosopher who played a major role in the scientific revolution. He proposed that all falling bodies/objects accelerate uniformly. Meaning if I dropped a bowling ball and a golf ball from the rooftop they will hit the earth at the same time. Is this true? Why or why not?

Gravity and Weight Day

What causes the path of a projectile to be curved? Essential Question What causes the path of a projectile to be curved?

Notes

Weight The force that gravity exerts on an object. Formula: Fw= m * g Variables: Units: Fw- Force of weight N-Newton = (kg*m/s2) m- mass kg g – gravity 9.8 m/s²

Weight Fw = m*g List the other two ways to write the formula Fw m g

If the mass and/or acceleration of the object exceeds the centripetal force, then the object will not make the curve. Like swinging a 10 lb weight around on a piece of string.

Falling Objects A falling object will accelerate downward at 9.8 m/s/s (in a vacuum). However, in real life air resistance will gradually slow it down. Terminal velocity is the top speed reached by a falling object. At terminal velocity air resistance is equal to gravitational pull.

Which will reach terminal velocity first, the feather or the coin? Which will have the higher terminal velocity?

Mini-Lab Questions Pre-Lab Questions If you drop the two objects from the same height, will they hit the floor at the same time? Does the mass or weight of the object have an effect on how fast the object falls?

Mini-Lab Questions What does gravity mean to you? Post-Lab Questions What does gravity mean to you? Is gravity a weak force or a small force? Think before you answer? How do you know that there is gravity on Earth?

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