force and motion
DESCRIPTION
demonstrated for Grade 3-RomansTRANSCRIPT
FORCE AND
MOTION
• When force is applied, it can change the motion or movement
of things in several ways.
FORCE
-is simply a push or a pull.
FORCES THAT MAKE
OBJECTS MOVE
WIND-When the wind blows hard, the kite moves fast and flies high.
WATER-The running water exerts a force that can move things.
GRAVITY-The force that pulls objects toward the center of the earth.
What do you think they are doing?
MAGNETISM-The force that pulls and attracts objects made of iron and steel towards a magnet
MAGNETIC MATERIALS
• tin cans• Iron nails• needles• safety pins
NONMAGNETIC MATERIALS
• paper• wood • glass• rubber• cloth• plastic
What are the forces we discussed?
•Wind•Water•Gravity•Magnetism
BALANCED AND UNBALANCED FORCES
• When the forces acting on an object are balanced, there is no motion
• When the force acting on an object is
not balanced, motion takes place
Let’s try it!
INERTIA• The tendency of an object to remain at
rest or resist a change in motion due to some external forces.
HOW THIS HAPPENS?
ACTION AND REACTION
• For every action, there is an equal and opposite reaction.
SHOW IT HOW!
KEY POINTS
• Force is a pull or a push.• There are different forces that make objects
move:-wind, water, gravity, magnetism.• Unbalanced forces cause objects to move• Inertia is the tendency of an object to remain
at rest, or to keep moving in the same direction unless an outside force acts on it.
• For every action, there is an equal and opposite reaction.
ANSWER ME!
• Why should you hold on tightly when riding a bus?
• You need a wind to blow to fly your kite up the sky. When the wind stops blowing, what happens to the kite? Why?
True or False
____ 1. Force is needed to make things move
____ 2. Running water has force that can move
things
____ 3. The farther away from the center of the
earth, the stronger the pull of gravity.
____ 4. A magnet pulls or attracts wood and
plastic.
____ 5. For every action, there is equal and
opposite reaction.
ASSIGNMENT
• Do activities on pages 255 and 257.