Lesson Plan of Effects of Forces (General Science Grade IV)

Lesson Plan of Effects of Forces

General Science Grade IV

Students’ Learning Outcomes

·         Demonstrate how force can change the position and the shape of an object.

·         Explore that greater the force, greater the change in the distance covered by the object.

·         Design experiments to demonstrate that some objects can return to their original shape after the release of force. Information for Teachers

·         When a push or pull is applied to an object, it changes its position or it changes its shape.

·         The greater the force, greater the change in the distance covered by the object.

·         Some objects return to their original shape after the release of force and some don’t.

Material / Resources

Ball, coins, rubber bands, kitchen sponge, balloon, clay, textbook

Worm up activity

·         Place a ball on the floor.

·         Ask the students how can they move this ball?

·         Ask a student to move the ball.

·         Then ask another student to push it harder.

·         What happens when you apply more force on the ball?

(Conclude that greater the force, greater the distance covered by the object)

·         Give a rubber band to a student ask him/her to stretch it softly. Then ask: Does the shape of rubber band change when stretched?

(Students’ response: force changes its shape)

Development

Activity

·         Place a coin on the table.

·         Ask students to observe the position of the coin.

·         Ask one student to push the coin gently. Note the new position as well as the distance covered by the coin.

·         Ask the same student to push the coin with more force.

·         What difference do you observe in the two cases?

(Students’ response: Greater the force, greater the change in the distance covered by the object)

·         Have other two students try the same activity with a sharpener and eraser and observe the difference in distance covered.

Activity 2

·         Give a kitchen sponge to a student and ask him/her to squeeze it.

·         Ask the students: What happens when you squeeze it? (It changes its shape by applying force)

·         What happens when you release it? ( It regains its original shape)

·         What does it show?

(After students response tell them that some objects regain their shapes on removal of force)

·         Ask different students to repeat the experiment with a spring.

Activity 3

·         Take an inflated balloon.

·         Ask a student to press the balloon gently by hands.

·         Ask students: What happens when he/she presses the balloon? (It changes its shape)

·         Ask what happens when he/she releases it? (It regain its shape after the removal of force)

·         Repeat the activity with different students.

Activity 4

·         Ask a student to a ball of clay and press it with hands inside a mold.

·         Ask the students what happens when you press the clay ball with their hands. (Response: its shape changes)

·         Ask that does it return to its original shape when hands are removed. (Response: No.)

·         Tell students that some object do not regain their original shape after the removal of the applied       force.                                                                                                                                            

                                   

                                                           

                                               Sum up /Conclusion

·         Ask the students: What effects of force did you observe today? Write the correct response on the board:

v  Force can change the position of an object.

v  The greater the force, the greater the distance covered by an object.

v  Force can change the shape of an object.

v  Some object return to their original shape after the release of force and some not.

Assessment

·         Ask the following questions from different students and write the correct answers on the board:

v  Which of the things could you change the shape of by applying force.

a)       A plastic ball

b)      A metal toy

c)       A glass cup

v  What happens when you stretch the plastic bottle by your hand and release

a)      It changes shape

b)      It breaks

c)       It regain its shape

v  When you apply greater force on the bicycle pedals

a)      It covers greater distance

b)      It slow down

c)       It stops

v  How could you stop a toy car moving down a slope?

a)      Give it a push

b)      Put hands in its path

c)       It is impossible to stop

v  When a force is applied on a rubber band

a)      Its shape changes

b)      It stays the same

c)       It breaks

Follow up

·         Survey the classroom to find things that need either a push or a pull to make them move in different directions.

·         Discuss where pushes and pulls changes the shape of different objects in everyday life and enlist them.

·         Find two materials in which objects regain their original shape after the removal of applied force.

·         Find two materials in which objects change their shape on applying force but don’t regain their original shape on removal of applied force. Draw their pictures: