GRAVITY What is Gravity Gravity is an attractive

� � What is Gravity? Gravity is an attractive force that exists between any

� � Newton’s laws of gravity. 1) All particles in the universe attract each

� 2) The force of attraction between two particles increases as the mass of

� � 3) The force of attraction between two particles decreases as the distance

� Technically Earths gravity field never runs out. It just gets incredibly small.

� What falls faster, a heavy or light object?

� Objects fall at the same rate because a more massive object have more

� Do all objects really fall at the same rate on Earth? � http:

� � � Why do objects not fall at the same rate on Earth?

Feather Vs. Hammer � What would happen if you dropped a feather and hammer

Gravity Write up � � � � � For both 1 M and ½

Slides: 17

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GRAVITY

� � What is Gravity? Gravity is an attractive force that exists between any two particles in the universe.

� � Newton’s laws of gravity. 1) All particles in the universe attract each other. (Everything has gravity). This means everyone is attracted to me

� 2) The force of attraction between two particles increases as the mass of either or both increase (similar to larger magnets having more pull)

� � 3) The force of attraction between two particles decreases as the distance between them increases. The force is inversely related to the distance multiplied by itself. (The further away you get the less gravitational attraction)

� Technically Earths gravity field never runs out. It just gets incredibly small.

� What falls faster, a heavy or light object?

50 lbs

50 lbs 50 lbs

� Objects fall at the same rate because a more massive object have more gravity pulling down on it, so the force to move is still equal.

� Do all objects really fall at the same rate on Earth? � http: //www. youtube. com/watch? feature=youtub e_gdata_player&v=qu. Zx. SCnnu 8&desktop_uri=%2 Fwatch%3 Fv%3 Dqu. Zx. SC nnu 8%26 feature%3 Dyoutube_gdata_player&ap p=desktop

� � � Why do objects not fall at the same rate on Earth? Objects do not fall at the same rate on Earth because we have air resistance which is an outside force counteracting gravity. (most objects however do fall at the same rate) Weight does not effect gravity. Things like shape and surface area can effect how fast an object falls through air.

Feather Vs. Hammer � What would happen if you dropped a feather and hammer without air resistance? � Https: //www. youtube. com/watch? v=KDp 1 ti. Us. Z w 8 � If there is no air resistance objects do fall at the same rate. (example the moon which is a vacuum)

Gravity Write up � � � � � For both 1 M and ½ M give: Vibration, Frequency, Period, Gravity, % error Define Gravity. ? Law 1 (define and explain)? Law 2 (define and explain)? Law 3 (define and explain)? Which falls faster in a vacuum a feather or brick? Why do things not all fall at the same rate on Earth? Why did we have % deviation? How could we prevent our errors?