Push and Pull Activity Objective Students will design

Push and Pull Activity • Objective: Students will design experiments to explore the effect of forces on an object (such as push and pull, gravity, friction, or magnetic field). • Using materials on your tray design experiments that demonstrate, to the class, the effects of push and pull, gravity, friction, and magnetic fields. Draw diagrams and write explanations in your science journal of how your demonstrations modeled each force.

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?

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

Magnetism - The force of repelling or attraction between two poles of a magnet.

Gravity

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

Gravity – The force that pulls all objects downward toward Earth’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.

Friction – Slows objects down and makes them stop.

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.

And sometimes forces work together! Which two forces are working together here? Gravity & Friction!

What causes the leaves to fall to the ground during the autumn season? A. Magnetism B. A pushing force C. Gravity D. Erosion

The moving of an object is called -A. force B. friction C. magnetism D. gravity

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? A. A pushing force B. A pulling force C. A magnetic force D. Both A and C

Forces in My Everyday Life! Pulling Forces Pushing Forces

Push & Pull Forces Formative Assessment 1. Draw a bubble map like the one below: Pushes Pulls 2. Sort these forces into the correct green circles: gravity opening a soda can walking forward combing your hair sharpening a pencil typing on a keyboard squeezing your toothpaste zipping up your jacket 3. Write some things that require you to use push and pull forces in the middle purple circles. 4. Add circles to your double bubble map in any category.