Gravity Flashcards
Do gravity’s effects reach across the universe?
Yes. Two objects across the universe from each other will still feel gravitationally attracted to one another.
How does the force of gravity that you feel change as you get further from from earth’s surface?
It decreases exponentially. Because in the gravity equation “r” or distance is squared.
If Earth were to double the mass that it currently is, how would that affect the strength of its gravitational force?
It would double its strength.
Why does the moon keep orbiting around Earth?
Because of gravity and inertia. Gravity makes the moon’s path curve, while inertia keeps the moon moving.
Why is there a high tide on the side of the Earth facing the moon.
This high tide is caused because the water on this side of the Earth feels the strongest gravitational pull to the moon.
Why is there a high tide on the side of Earth that is not facing the moon?
The water on this side of the Earth forms a high tide, because the pull of gravity is from the moon is weaker, and the earth spins, allowing the water to sort of bulge out.
How are force, area, and pressure related?
Pressure is equal to the amount of force, divided by the area over which it is spread. Pressure= Force ÷ Area
How do snow shoes keep you from sinking into the snow?
Snow shoes increase the area over which your force/weight is spread out, decreasing the pressure.
How can you tell if something will float in water?
If it is less dense than water, then it will float in water.
If you throw a ball in the air, how much POTENTIAL energy does it have at the very peak of its flight? What about right before it hits the ground?
The ball has the most potential energy at the peak of its flight, and the least right before it hits the ground.
If you throw a ball in the air, how much KINETIC energy does it have at the peak of its flight? What about the instant before it hits the ground?
The ball will have the least kinetic energy at the peak, and the most right before it hits the ground.
Name some types of energy.
Elastic energy
Chemical energy
Thermal energy
Light energy
(There are more than this, but these are the ones we focused on)
Think of an example of a transformation between two types of energy.
Plugging in a space heater. (electrical is converted to thermal)
Eating a salad (chemical is converted to energy to keep your body functioning, or warm. Thermal energy?)
Sitting by a bonfire (light energy converts to thermal energy, and makes you warm.)
