Force and Gravity
A force can be described as a push or a pull.
True or False?
True
Magnetism is a close partner of electricity.
True or False?
True
In what year did the movie "Apollo 13" come out?
1995
Inertia does not work on moving objects.
True or False?
False
When did Sir Isaac Newton write his Law of Universal Gravitation?
After an apple fell from a tree.
What kind of force are you using when you push a book across a table?
contact force
What is the movement of electrons known as?
electricity
How is weightlessness achieved by NASA's KC-135 plane?
What is inertia influenced by?
mass
Newton's Law of Gravity has been used to make predictions about what?
space
What is another name for non-contact forces?
field forces
What does friction resist?
What was the KC-135 airplane's nickname?
"The Vomit Comet"
What is a good example of an object in constant motion?
What is the force called that causes apples to fall from trees?
gravity
What causes a ball thrown in the air to fall to the ground?
gravity
Which force is most responsible for slowing a bicycle down when the brakes are applied?
friction
Why did they use astronauts use the KC-135 airplane?
To prepare themselves for the weightlessness of space.
What does an object need in order to change its motion?
force
How were astronomers able to predict where Neptune would be?
Uranus's orbit was kind of weird, so they figured there must be a planet whose gravity was pulling its orbit.
What determines the strength of gravity?
mass and distance
Which tool is used to measure the force of friction?
a spring scale
It is possible to escape gravity on Earth.
True or False?
False
What is inertia?
It is the tendency of all objects to continue doing what they are doing.
What did Newton say was preventing the Moon from crashing into the Earth?
The momentum of Earth's orbit.