![]() ![]() When two surfaces slide against each other, they stick very slightly together with the help of friction. For example, when you push buttons on your smartphone or close the door. This is a force that is used to a subject. The force that keeps the book still is named normal. It doesn’t move because the gravity that pulls the object down is equal to the force on the table pushing up. In that case, a book on the table stays still. That happens due to the equilibrium of forces. Sometimes several forces can affect the object, but it remains its characteristics. Thus, sets of magnets push the train forward. It is the reason why the train always hovers up to nearly ½ inches above the track. For example, magnets are used in fridges, the doors of refrigerators close and stick tightly with them.Ī maglev train can reach 360 mph without an engine, but thanks to magnets! Magnets under the train and on the track push against each other. Other things are called non-magnetic.ĭo you know? Magnetism is applied in different areas of life. The things which can pull objects are named magnetic. They don’t pull on wood, plastic, copper, or gold. They pull on some metals such as iron and nickel. Magnets are objects and materials which can produce a magnetic field. It is another invisible force that can pull and stick some objects to a magnet. The gravity of our Sun is the heaviest in our solar system. Tip to note: Newton was the first scientist to write about gravity.ĭo you know? Earth is the nearest object to us, which has gravitation, but not the one! The Moon has gravitation, but less than Earth. If things had no gravity, they would fly into space. Takeaway: when you throw something, gravity will pull it to the ground. ![]() When roller-cars get to the top, gravity pulls it down. We can feel the force of gravity on roller-coasters. The harder an object will pull, the stronger it will fall to the ground. Gravity is a natural force, which controls everything in the universe - even revolving Earth around the Sun! Each thing has its gravity. Thus, an apple falls from a tree, thanks to gravity. It is an invisible force that pulls objects toward the ground. Such kinds of strengths are natural and very mysterious. ![]() Interaction of objects without touching creates field forces. Depending on the types of objects in interaction, we give them different names. All things in contact can exert various forces. For example, a leg kicks a ball, or the wind blows against a moving car. Contact strengths are made when objects touch each other. Generally, there are contact and field forces. See them yourself below! Contact forces and field forces Takeaway: there are several types of forces. It is slowly falling thanks to the force of air resistance.
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