Forces!

What Is Force?

It takes a force to move something.

A force is a push or a pull . . . that causes an object to move, stop, or change direction.

When you push an object, it moves away from you.

When you pull an object, it moves toward or with you.

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull?

Is this a push or a pull? What is the pulling force called?

Some Types of Forces Gravity Friction Magnetism Erosion (wind and water)

Gravity

Gravity: the force that pulls all objects in the universe towards each other’s center.

Gravity The mass of an object determines how much gravity that object has. For example: The moon and Earth are pulling on each other. The Earth is bigger than the moon so its gravitational pull is stronger. That is why the moon orbits the Earth. What would happen if the moon was bigger than the Earth?

Friction

Friction . . . a force that acts against something when two surfaces rub against each other.

A softball player sliding into home on the rough dirt has a lot of friction and can stop.

A sled on smooth ice will keep sliding and is hard to stop because it has only a little friction.

What causes the leaves to fall to the ground during the autumn season? gravity push magnetism What causes the leaves to fall to the ground during the autumn season? Magnetism A pushing force Gravity Erosion

The moving of an object is called -- What causes the leaves to fall to the ground during the Autumn season? gravity push magnetism The moving of an object is called -- force friction magnetism gravity

What causes the leaves to fall to the ground during the Autumn season? gravity push magnetism Which of the following is an example of a force that is different from gravity? A. an apple dropping to the floor B. a boy slamming a door C. a leaf falling to the ground D. water dripping from a faucet

What force is represented in the above picture? What causes the leaves to fall to the ground during the Autumn season? gravity push magnetism What force is represented in the above picture? A. A pushing force B. A pulling force C. A magnetic force D. Both A and C

May the Force Be With You Activity Stations

Station 1:Building a Card House You must use build a card house using All of the cards in the deck. The house must be a minimum of 5 stories high with 3 rooms on each floor.

Station 2: Marble Motion and Forces Build a ramp and roll a marble down a ramp. At the end of the ramp the marble pushes a cup until it stops on graph paper. Instructional Video http://www.doingscience.org/physical-science-1-2-3/marbles-forces-and-motion

Station 3: Force and Friction Lab Pull the following materials with the spring scale and record your information

The object is to not let gravity pull the marbles to the tray! Station 4: Kerplunk! The object is to not let gravity pull the marbles to the tray!

Station 5: FORCE MOTION AND FRICTION RAMPS Use the 3 ramps to record how a toy car moves along different surfaces.