SCIENCE CONCEPT:
- Newton's First Law of Motion: objects at rest remain at rest and
objects in motion remain in motion unless acted upon by an
outside force.
STUDENT OBJECTIVE:
- The student will discover that friction is an outside force
that happens when two things rub together.
OVERVIEW:
- The student will use their hands to discover friction.
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PREPARATION TIME:
- 5 minutes.
LESSON TIME:
- 5 minutes.
TEACHER PREP:
- Gather materials.
WORDS TO KNOW:
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TEACHER TEXT:
- Sir Isaac Newton's Second Law of Motion tells us how an object's
motion changes when a force acts on it. To explain it clearly,
we need to define two terms: mass and acceleration. Mass is the
amount of matter or substance an object is made of.
Acceleration is the change in speed (either slower or faster)
with respect to time. As Newton's First Law states, an object
cannot accelerate or decelerate unless force is applied to it.
Most of the motions that we find on earth involve friction.
Friction is a force which occurs when two surfaces rub against
one another. If you roll a ball slowly across the floor, the
ball's speed decreases and eventually it stops. It stops
because the friction between the ball and the floor pushes
against the ball and reduces its motion.
When you rub your hands together, you feel the resistance due to
friction. By rubbing your hands together, you are doing work.
The result of this work is the heat produced.
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Last modified: Tue Mar 24 15:17:30 PST 1998
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