force and motion

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.