Long Constructed Response
Students use strong magnets to make metal paper clips move across a wooden table. To do this, they place a metal paper clip on top of the table. Next they place a strong magnet under the table, the metal paper clip moves on top of the table. When they move the magnet under the table, the metal paper clip moves on top of the table.
What force makes this happen?
Magnetism, the force from the magnet, makes the paper clip move. Magnets can apply a force to metal objects that they are not touching. The magnet under the table is applying a force to the paper clip that it is not touching.
What is Force?
A push or pull that acts on an object
Explain the difference between a push and a pull
A push refers to moving something away from them, while a pull involves bringing something closer to them
Describe position, motion, and force
Position: Is the location of an object
Motion: Is a change in the position
Force: Is a push or pull on an object
Read the sentences. Choose the words to describe the forces. Gravity is a force that ____ on all objects. Magnetism is a force that pulls some objects ____ direct contact.
Pulls; without
Students want to test pushing a bowling ball with different amounts of force and measure the change in motion. Include the materials needed and the steps that should be followed
1. Push the bowling ball with a small amount of force.
2. Measure how far it moves (or measure the time it takes to move a set distance
3.Push the bowling ball with more force and repeat step 2
4. Continue pushing with more force and repeating step 2 for at least three trials
What is Gravity?
The force that pulls all matter together
Do forces always cause motion?
NO! Forces can cause motion but not always. You can push on a wall, but it will not move. Gravity is always acting on objects, even if they are not moving.
What is a balanced and unbalanced force? Give me an example of each
Balanced force: Two or more forces on an object that are equal. Examples: A book resting on a table or a person standing still
Unbalanced force: Are unequal forces, acting in opposite directions. Examples: Kicking a soccer ball or pushing a shopping cart.
What forces are involved in jumping?
The force of gravity, pulling you downward, and the pushing upward from the ground
How can you demonstrate how gravity affects the ball?
Drop the ball from the top of your desk.
What is pattern?
Something that repeats in a regular way
How does gravity act on an object? By touching it? Without touching it?
Without touching it!
What does the north end of one magnet do to the north end of another magnet? The first magnet ____ the second magnet if it is _____.
Pushes; Close enough
Draw a picture of a person moving a box. use an arrow to model the forces. Label the arrows with the names of the forces
Answer may vary
How can you stop a soccer ball that is rolling toward you?
Apply a pushing force with your foot
What is motion?
A change in position
How are gravity and magnetism the same as pushes and pulls? How are they different?
Gravity and Magnetism: Moves objects without touching them and acts at a distance
Pushes and Pulls: Moves objects by touching them and they are contact forces.
Both: They are both forces and can make things move
Draw a picture of game that uses a ball. Use labels and arrows to explain how the position and motion of the ball change during the game
Answer may vay
A student wants to play on the slide at the playground. First, she climbs up the ladder. Then she sits on the edge of the slide and slides down to the ground?
What force allows the student to climb up the ladder? Push, pull gravity?
The force from her legs is pushing her up
Write a sentence that uses the word force, with three examples
Answer may vary
What is magnetism?
A force that pulls together or pushes apart certain metal objects
You could use a magnet. The magnet could be placed near the metal ball, and it would be pushed away from the magnet or pulled toward it. The force is magnetism
Describe what the player has to do to toss a horseshoe to the closer post and then toss a horseshoe to the farther post
To toss the horseshow to the closer post, the player uses a small amount of force. To toss the horseshoe to the farther post, the player has to use a large of force
How do we model forces?
The direction of force can be modeled with arrows. A push moves an object away. A pull brings an object closer