What happens when you drop a needle in water?

What happens when you drop a needle in water?

A metal needle or paper clip has higher density that that of water. So when it is dropped into water, it falls down into the bottom of water. However, if we put it horizontally on the water with a lot of caution, it can float almost forever due to the surface tension of water.

What happens to the needle and the pin when you carefully drop them on the water surface Why?

Surface tension happens because the water molecules at the surface of the water are strongly attracted to each other more than they are to the air molecules above them. The water molecules make an invisible skin on the water’s surface that allows things like the needle to float on top of the water.

Why a needle sinks in water however a large ship floats on surface of water in the sea?

In case of iron needle , the weight of water displaced by needle is much less than the weight of needle, hence, the iron needle sinks into the water. In case of a large iron ship, the weight of water displaced by the ship is higher than the weight of ship, hence the ship floats in water.

Can a pin float on water?

In the beginning of the activity you should have noticed the rubber band and the pin floated on the water’s surface. They float because water molecules hold on to one another in a way that creates surface tension. This property allows many things to float on water, including your rubber band and pin.

What do you think caused the needle to move?

The movement of the compass needle lets you know that the circuit is complete. Since the compass needle is also a magnet, the magnetic field around the wire attracted and repelled the ends of the compass magnet and caused it to move. You have seen that electricity flowing through a wire can cause a magnet to move.

What causes a needle to sink in water?

Also if you touch a little soap onto the surface it cause the needle to sink too. The surface of a drop of water is always puling inwards pulling the surface of the drop as small as possible, this is called surface tension.

Why does a needle float on the surface of water?

Why does a needle or paperclip float on the surface of the water if it is kept gently? Due to surface tension of the water on the surface the needle floats. Consider the water surface like an elastic rope. When a small object having less weight is kept on the rope the rope deforms down a little amount.

Why are water droplets always round in shape?

The surface of a drop of water is always puling inwards pulling the surface of the drop as small as possible, this is called surface tension. A sphere is the shape with the least surface for its volume so surface tension tries to pull water droplets into spheres which is why they are round.

What happens if you wet the same needle and tried again?

The needle, not being porous, remained dry. What would happen if you wetted the same needle and tried again? As you probably figured, because it is already surrounded with water molecules, a wet needle will sink, just like water-logged paper.