Gravitation Activity 4 An example of force at a distance

Activity No #4 Why do objects feel heavy

• Estimated Time - 30 minutes
• Materials/ Resources needed

1. A piece of iron
2. A piece of wood
3. A ball of yarn or cotton

• Prerequisites/Instructions, if any
• Multimedia resources
• Website interactives/ links/ simulations
• Process (How to do the activity)

1. Hold each object in your palm
2. What do you feel when you hold each one of them (ask them to answer as light--->heavy)

• Developmental Questions (What discussion questions)

1. Is there a difference when you hold each of them?
2. Is this due to inertia? Am I changing anything when I am holding?
3. What might this difference be due to?
4. This is due to a property called weight which is because the mass of this object interacts with another mass - that of the earth. We call this weight
5. We will study more about this - but mass also interacts with other masses; this is called gravitational property. We already saw that is has an inertial property
6. The Earth is not touching the object, but still its mass has an effect on the mass on my hand
7. Gravity can act at a distance between two masses

• Evaluation (Questions for assessment of the child)

1. Does mass have both inertial and gravitational property?
2. Does gravitational property depend on size? Or mass?

• Question Corner

1. If an object has inertia, when I drop the object why does it fall?
2. Do you feel the gravitational effect of the Earth?