Focus Skill 13: Know that the greater the mass of an object, the more force is needed to achieve the same rate of change in motion.
a. sort items based on greater and less mass
b. when presented with two items, will show which item requires more force to move
c. select from two pictures, which item requires more force to move
d. will sequence three items in the order of amount of force needed to achieve the same change in motion

Get objects around the class for

"Let's try this in the class.
(call on volunteer to push two objects, have state which requires more force/pressure to push. Repeat with other students and other objects)"




Today we are going to talk about mass.
mass scale.gif

Before we talk about mass, we need to know what mass is.

Screen Shot 2014-10-23 at 8.06.23 PM.png

Mass is how much there is of an object.


Feather.jpeg
The feather's mass is small.

bowling_ball.jpg

A bowling ball's mass is much greater than the feather's.

We can tell which object has a greater amount of mass by the force or pressure it takes to move the object.

Pushing Car.jpg
The car takes a lot of force or pressure to move.

Flicking Dominos.JPG
The dominos take very little force or pressure to move.


boulder force.jpg
The boulder can't be moved by one person alone.


Let's try this in the class.
(call on volunteer to push two objects, have state which requires more force/pressure to push. Repeat with other students and other objects)



This video is more about weight in space, but they talk about mass too.



Now lets do a worksheet together.
(pass out worksheet, complete with students. have students come up and show answers.)

Screen Shot 2014-10-23 at 9.24.23 PM.png


(as closure, watch the Bill Nye video and then free time)