Science - Gravity and Friction

22 terms by karlahaben Plus

Create a new folder

Advertisement Upgrade to remove ads

gravity

the force that attracts two masses to each other

strength of gravity depends on two things

mass and distance

What happens to frictional force as you continue to push an object?

It remains constant but at a lesser level once the object is moving.

friction

resistance due to the motion of two objects in contact

ways to increase friction

increase the weight of the object, rough surface, move surfaces against each other, etc.

ways to decrease friction

wheels, decrease the weight of the object, smooth surface, resist movement between surfaces, etc.

Air resistance

the friction due to air; affected by speed and surface area

Mass

the amount of matter in an object; does not change depending upon location

Weight

the measure of the downward pull of gravity; changes depending upon where you are in the universe

Terminal Velocity

the point at which an object can no longer accelerate; air resistance meets gravity

How do objects orbit?

The balance between the mass of two objects and the distance of the two objects are perfect.

What three things does friction depend upon?

types of surfaces, motion of surfaces, how hard the surfaces are pushing together

How does friction produce heat?

molecules on the surface move faster and the temperature increases

Four types of friction

rolling, sliding, static, fluid

static

not moving or changing

fluid

liquid or air

rolling

wheels or ball-bearings

sliding

what we tend to think of when we say friction; objects rub together

If I drop a math book and a novel at the same time, which will be most affected by air resistance?

The math book, because its surface area is bigger. Gravity will act the same on both of them but air resistance will want to push the math book up with more force.

How does your weight and mass on Earth compare with your weight and mass on Jupiter? Why?

Because Jupiter has so much more mass than Earth, it has much stronger gravity, so I would weigh a lot more. My mass is the same, because the amount of matter in me hasn't changed.

How does gravity, terminal velocity, and air resistance work on a penny when it is dropped from a 50 story building?

Gravity pulls the penny down, but air resistance pushes the penny up against gravity. At a certain point, air is pushing up on gravity so much that gravity can't accelerate anymore. This is when the penny reaches terminal velocity.

If I throw something forward and drop something at the same time, when do each of the objects land?

At the same time. Gravity pulls everything at the same rate.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set