· Theme: Investigating force and energy.
· Learning Area: Force
· Learning Objective: Understanding the effect of a force
By the end of the lesson, pupils should be able to:
· state that a force can move a stationary object;
· state that a force can change the motion of an object;
· state that a force can change the shape of an object.
· Non living things cannot move unless caused by external force
· Force cannot be seen but its effects can be observed
· Observing, classifying, making inferences, interpreting data, making conclusions, comparing and contrasting.
Vocabulary/ New Words:
Change direction, speed up, exerted, temporary, original shape, elastic, permanent, magnets, attract, repel.
· Having an interest and curiosity towards the environment.
· Being diligent and persevering.
· Realising that science is a means to understand nature.
· Thinking rationally
· Analyse the things around us
· Identifying relevant contents associated with environment and everyday life experience
- ball, sponge, paper clip, spring, rubber band.
Point(s) to Note:
- changes of direction and shapes of an object requires force.
- The speed of an objects can be changed by applying force.
Teacher plays the Introduction component. Teacher recaps force cannot be seen but it effects can be observed by repeat some activities concern it. Teacher show the video clip of twist a balloon. Teacher can demonstrate on how to twist a balloon to form a toy by tell them the force cannot seen but its effects can be observed. Play the video on swing, prompt pupils to differentiate whether this action is push or pull. Encourage the pupils to answer. Show the video clip of bowling and explain the effects of force to an object. Bowling pins change their motion as being hit by bowling ball. The sugar cane changes its shape as it goes through the machine. Allow pupils to give some other examples.
Teacher can use badminton, football and tennis ball to explain the effects of forces to a ball. Then, teacher plays the video clips on content 1 to show them about effects of forces on the motion of an object. Pause the video for a while, explains clearly how force can move a stationary object, stop a moving object, change direction of a moving object, slow down the movement of a moving object and speed up the movement of a moving object. Pause the video for a while, ask students to put up their hands and give their examples. Prompt pupils to explain how forces affect the motion of an object. Encourage the pupils to give other examples.
Component: Content 1
Teacher uses some daily activities to explain the effects of forces on changing the shape of an object. The changes can be permanent and temporary. Show them the video clip on the changes of shapes on some materials like sponge, spring and rubber band. The changes of shape will be temporary for this example, they will return to original shapes. Pause the video for a while, discuss about the concept of elastic. Play video on the change of shapes is permanent, once the brick was break, it cannot return to its original shape. Give some other examples: sawing a plank, sewing a cloth and cut vegetables. Divide class into 2 groups, each group should give 6 examples which when forces apply, the objects can/cannot return to their original shapes.
Component: Content 2
In this activity, four questions on how forces change the motion of an object.
Pupils are expects to view the animation and answer the questions by clicking the correct answers.
Pupils need to observe the motion of the ball after ball being pushed.
There are five questions in this component cover the two learning outcomes. For Questions 1 to 3, allow pupils choose the correct answers for the objective questions. Q4 contains of drag and drop, pupils need to drag and drop the correct answers for the questions appeared. Q5 consists of true or false questions. Pupils need to identify whether the statements are true or false.
Teacher plays the Extension component concerning magnets. Guide pupils to understand the magnets that attract metal/ iron involve push and pull actions. Pupils need to understand the force depends on the strength of the magnet and the metal. Prompt pupils to remember the unlike poles of magnets attract each other, like poles of magnets repel each other.
Teacher concludes the lesson by playing this component to further reinforce understanding of the lesson. Teacher asks pupils to state that a force can move a stationary object, a force can change the motion of an object and a force can change the shape of an object. Prompt pupils to explain these two concepts.