# forces! what is force? it takes a force to move something

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• 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 ForcesGravityFrictionMagnetismErosion (wind and water)

• Gravity

• Gravity:the force that pulls all objects in the universe towards each others center.

• GravityThe 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?

magnetism

push

gravity

What causes the leaves to fall to the ground during the autumn season?

MagnetismA pushing forceGravityErosion

• What causes the leaves to fall to the ground during the Autumn season?

magnetism

push

gravity

The moving of an object is called --

forcefrictionmagnetismgravity

• What causes the leaves to fall to the ground during the Autumn season?

magnetism

push

gravity

Which of the following is an example of a force that is different from gravity?

A. an apple dropping to the floorB. a boy slamming a doorC. a leaf falling to the groundD. water dripping from a faucet

• What causes the leaves to fall to the ground during the Autumn season?

magnetism

push

gravity

What force is represented in the above picture?

A. A pushing forceB. A pulling forceC. A magnetic forceD. Both A and C

• May the Force Be With YouActivity Stations

• Station 1:Building a Card House

You must use build a card house usingAll of the cards in the deck.The house must be a minimum of 5 stories highwith 3 rooms on each floor.

• Station 2: Marble Motion and ForcesBuild 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.

http://www.doingscience.org/physical-science-1-2-3/marbles-forces-and-motion

Instructional Video

• Station 3: Force and Friction LabPull the following materials with the spring scale and record your information

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

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

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