of mass m begins to slide down an inclir
acts on the block which displaces it by d
ement is 30 degrees. From the data give
f the following factors?
Answers
Explanation:
Fill the plastic bottle to the top with rice grains. Optional: You can use a funnel for easier filling.
Make sure you fill the bottle all the way to the top. Press on the rice to compress it tightly.
a bottle full of rice used in this Friction Experiments
Insert the blunt end of the chopstick or pencil into the rice and press it all the way to the bottom.
Put chopstick into the bottle full of rice in this Friction Experiment
Lift slowly to test if the bottle comes up with the chopstick. If not, repeat this step several times. It will become increasingly difficult to push (or stab) the chopstick down.
Girl sticks chopstick into the bottle in this Physics Friction Experiment
Eventually, you won't be able to pull the chopstick out and you can lift the bottle and the rice together with it.
Lifting the chopstick lifts up the entire bottle of rice
Notes
Try using different types of grains and see what happens.
Try inserting (stabbing) from different angles or shake the bottle a little. What is the easiest way to make the chopstick stick?
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Why
When you first fill the bottle with rice, there is a little bit of space, i.e. an air pocket, in between each grain and its neighbors.
As you press the pencil into the bottle, the grains of rice are pushed together to make room for the pencil.
The grains are packed closer and closer together each time you insert the pencil until the grains are rubbing against one another with little or no air pockets in between.
This is when friction can make the pencil “stick” in the rice.
Build A Paddle Boat | STEM For Kids
Friction is a force of resistance when one object’s surface moves over another’s.
It always opposes the motion or attempted motion of one surface moving across another.
When the grains are packed so tightly together, the friction between the rice and the pencil is strong enough to hold the pencil in place, allowing you to pick up the whole bottle with the pencil.
In this case, the friction is bigger than the gravitational force that is pulling the rice and the bottle towards the Earth.
Friction is very useful in everyday life.
We can walk because there is friction between the soles of our shoes and the ground.
When there is water or ice on the ground, friction is reduced making it easier for us to slip. Try this hovercraft experiment to see what happens when there is no (or very little) friction.
Laws Of Physics For Kids
We use friction in our lives everyday, but it is often not easy to see or understand what it is. Here are some great resources to help children understand friction and other basic laws of physics.
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Move It!: Motion, Forces and You
Forces Make Things Move
What Is Friction?
Hand picks up a bottle of rice using a pencil stuck inside. Can you lift a thousand pieces rice using a pencil?
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