Physical Science-Activity 1:Evidence of Interactions

Key questions:

How can you describe interactions?

What is the evidence that an interaction has occurred?

 

Demonstration A (hitting a table with a ruler)

Time interval

While the ruler and the table are touching

Claim: Object 1:    interacts      Object 2:

           Ruler             with             table

1. Evidence There is a change in (there are changes in)   the ruler is bending and the impact is loud. (Sound) (Motion)

Demonstration B (rubbing left and right hand together)

Time interval: While rubbing right hand against left hand

Claim: Object 1:    Interacts    Object 2:

            Hand           with           other hand

2. Evidence: There is a change in (there are changes in) both hands are getting warmer and you can see them moving. (Heat) (Friction).

 Demonstration C

Time interval: while shooting a slingshot

Claim: Object1:  interacts    Object 2:  which interacts Object 3:
           hand           with       elastic band         with           ball

3. Evidence: There is a change (there are changes) in. The rubber band is being pulled back by the Hans at a distance (the length of the band has changed) (motion).

4. Evidence: There is a change (there are changes) in: The ball has flown into the air from potential to kinetic energy (credit to Sam-E) (the ball is one the floor) (length and motion).

 Answer to key question: What is the evidence that an inter action has occurred?

You can see the effect that the interaction caused.

Imagine that you were cold and you hold your hands near a fire. What is the evidence that your hands and fire are interacting?

Time interval: While you are holding your hands near the fire.

Claim: Your hands and the fire are interacting

Evidence: There are changes in your hands temperature (feeling warmer)



Hands near a fire

In a parking lot, you see two trucks back into each other. What is the evidence that the two trucks interacted during the collision?

Time interval: During the collision

Claim: The two trucks interacted with each other

Evidence: There are changes in: Sound and form/ condition of the back of the trucks (visibly bad) (the damage) (change in shape).