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ForceDayna Lee Martínez
STARS - USF
Maniscalco Elementary
What is a force?
A force is a push or pull that causes an object to move, stop, or change direction
What is friction?
PushFriction
What is friction?
Pull of the horseFriction
What is friction? A force that opposes motion Friction can make things slow down or stop, or it
can keep things from moving at all Friction is present whenever surfaces touch Friction is greater between rough surfaces than
between smooth ones Friction changes energy of motion to heat as
objects rub together
What is gravity?
Gravity is the force of attraction between objects Gravity causes falling objects to speed up as they fall
Gravitational Force The pull of all objects in the universe on
one another Depends on the mass and
the distance between the objects
The greater the mass and the closer they are, greater the gravitational force between them
Gravitational force
Which one will pull objects towards it’s center with more force, the Earth or the Moon? Why?
Weight Weight is the measurement of gravitational force
acting on an object
Will a person weigh
more on Earth or in
the moon? Where the mass would
be greater?
Magnetic and Magnetic Force An object that attracts iron and certain other
materials such as steel is magnetic
The force exerted by
a magnet is called
magnetic force
Magnetic Force
On a Roll Lab Manual, page 64