Floating and Sinking – Lesson 1

Grade: 5
Subject: Science
Date: September 28, 2020
Topic: Sink and Float
 
 

Content:  
Any object placed in water has two forces acting on it.
One is the force of gravity that pulls it downwards.
The other is the force of the water pushing it upwards.
The more water pushed away by an object, 
the harder the water pushes back.
When the downward pull of gravity on an object 
(its weight) is equal to the upward force of the water 
pushing back on the object, the object floats.
When the downward pull of gravity on an object (its weight)
 is greater than the upward force of the water 
pushing back on the object, the object sinks.
Class Activity
Answer the following open ended questions
1. What is a force?
__________________________________________________________
___________________________________________________________
___________________________________________________________.
2. List briefly what happens to an object when force is applied to it.
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
________________________________________________________________
_________________________.
The diagram below applies to questions 3 - 5

3. In this diagram, nobody is winning because the forces are
_____________________________________________________________
____________________________________________________________.
4. Nobody is winning because both teams are pulling with
___________________________ forces.
5. They are using ______________________________________  force
in their hands and the rope, and ________________________________
force in thier feet into the ground.
The diagram below applies to question 6

6. The two persons on the see-saw have the same weight and
stand at equal distance from the ________________________________
 ; so  they make the see-saw _____________________________________.
The diagram below applies to questions 7 - 8

7. Unbalanced forces causes _____________________________.
8. This see-saw does not balance because little Roy is ___________
 than  big Tim.
The diagram below applies to question 9

9. The see-saw is now balanced because Roy moves closer to the
_____________________________.
Explore 
1. Engage in an experiment.
2. The experiment is on page 39 of textbook,
Mission Science Student’s Book 5.