Ted Talk - Gravity

Why are the two objects attracted to each other? 

• They like each other

• Everything has gravity

• they have something in common with each other

When you drop a rock from a cliff, which of the following happens?

• None of the these

• Only the Earth falls up to meet the rock

• The rock and the Earth fall towards each other

• Only the rock falls to the Earth

If you place two teenagers with equal mass in space:

• We cannot even make an educated guess about what will happen

• They will fall towards each other

• They will remain in place

• They will move apart

Why do astronauts weigh less on the moon than they do on the earth?

• Astronauts weigh the same no matter where they are.

• It's a little known fact, but space suits generally make people weigh less.

• The moon has less mass than the Earth. Therefore, it has a smaller gravitational pull on the astronaut.

• The Earth is closer to the sun.

What is gravity?

• Only small things are attracted to larger things

• Everything is attracted to everything else

• What goes up must come down

• Only larger things are attracted to smaller things

What causes gravity?

• We don't know, conclusively.

• The amount of electrons in a particular object.

• Scientist determine the amount that objects are attracted to one another.

• The force of magnetism.