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