Prev

gravity


force that pulls objects toward Earth

When you drop something, the force of gravity makes it fall downward.

kinetic energy


energy an object has because of its motion

As they ski down a steep ramp, ski jumpers gain kinetic energy.

friction


force between two objects or surfaces that keeps the objects from moving freely

Friction is what stops a ball from rolling across rough grass.

drag


the slowing force of air or another substance on a moving object

It’s hard to walk into a strong wind, because the fast-moving air creates extra drag on your body.

aerodynamic


shaped in a way that makes it easier to move through the air

A sports car’s sleek shape makes it more aerodynamic.

lift


upward force

Air flowing around an airplane’s wings creates the lift that makes the plane fly.

Next
Problem loading video..
 
 
 
May 2017
Apr 2017
Mar 2017
Feb 2017
Jan 2017
Nov 2016
Oct 2016
Sep 2016
May 2016
Apr 2016
Mar 2016
Feb 2016
Jan 2016
Nov 2015
Oct 2015
Sep 2015
Apr 2015
Mar 2015
Feb 2015
Jan 2015
Dec 2014
Nov 2014
Oct 2014
Sep 2014
Apr 2014
Mar 2014
Feb 2014
Jan 2014
Dec 2013
Nov 2013
Oct 2013
Sep 2013