Sabiha Dalal, 6th Grade Special Education Teacher, Sepulveda MS
- Principle 1 - Inertia
- Principle 2 - Friction
- Principle 3 - Newton's 1st Law of Motion
a.)Students know a force has both a direction and magnitude
c.)Students know when the forces on an object are balanced, the motion of the object does
d.)Students know how to indetify separately the two or more forces that are acting on a single
static object, including gravity, elastic forces due to tenesion or compression in matter, and
b.)Students know that when forces are balanced, no acceleration occurs, thus an object
continues to move at constant speed or stays at rest(Newton's first law).
Questioning Script - (can be adapted with coins, games tokens, rulers)
1.) 10 quarters
2.) spatula or finger
1.) Place the stacked coins on a table.
2.) Hold the spatula blade flat against the table and with a quick flick of the wrist, slide the edge of the blade toward the bottom coin in the stack. Observe what happens. If you don't want to use a spatula you can use your pointer finger to move the coins.
3.) You can do this with your point finger and a variation of other types of coins as well.
Prior knowledge & experience:
Students know that friction is a force acting on objects. Also, they know about inertia.
1.) Explain what will happen to a stack of 10-12 quarters that is placed on a table,
when a spatula blade slides on the edge of the bottom quarter.
2.) What force(s) cause the quarter to stop moving.
3.) Create another way to illustrate inertia and demonstrate it to the class.
The bottom coin is ejected and the stack of quarters drops without tipping over. This demonstrates Isaac Newton's First Law of Motion. The spatula provides an external force which causes the bottom coin to move. Friction and air resistance causes the coin to come to rest.
Students will think that the stack of coins will knock down.
Photographs and Movies