Teach, continued
Define and Investigate the Law of Gravity
•Hold a pencil in front of you. Ask: ¿Por qué este
lápiz no se cae al piso? (because you are holding
it up)
•Ask: ¿Qué pasará si suelto el lápiz? (It will fall.)
¿Cómo saben que se caerá? (Possible answer:
A pencil always falls when you let it go.) Have
students observe the pencil fall after you release it.
•Say: Los objetos como los lápices caen debido
a la gravedad de la Tierra. La gravedad atrae
a los objetos hacia la Tierra, como ocurre
con los lápices.
• If you have yet to do so, ask the class to list familiar
objects that appear in the sky. Say: Hay algo que
sostiene o que ejerce una fuerza en cada uno
de estos objetos cuando están en el cielo. For
example, clouds are light enough for the air to hold
up. Birds and airplanes stay up because their wings lift
them into the air. A bat pushes on a baseball to lift it
into the air.
3 Assess
1.Recall ¿Qué objetos se quedan en el cielo?
(Possible answers: the sun; moon; stars)
2.Compare and Contrast ¿Qué diferencia
hay entre la Luna y una bola blanca que se
arroja al cielo? (Possible answer: The moon is
much farther away; the moon will stay up in the
sky, while the ball will come down.)
3.Generalize Mencionen algunos objetos
que pueden viajar de la tierra al cielo. ¿Qué
tienen en común? (Possible answers: kites,
birds, airplanes, helicopters; They all come down
eventually.)
Always Down Have partners investigate how different objects fall.
Have one partner hold an object in the air and then let it go. Have
both partners observe the object as it falls. Encourage them to
choose a variety of small objects, such as pencils, erasers, paper clips,
and a sheet of facial tissue. Have them make observations about
differences and similarities in the way different objects fall.
Day and Night T23
