Black Hole

A black hole is a region of spacetime where gravity prevents anything, including light, from escaping. The theory of general relativitypredicts that a sufficiently compact mass will deform spacetime to form a black hole.

Aurora

An aurora is a natural light display in the sky particularly in the high latitude (Arctic and Antarctic) regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere.

Eclipses

One consequence of the Moon's orbit about the Earth is that the Moon can shadow the Sun's light as viewed from the Earth, or the Moon can pass through the shadow cast by the Earth. The former is called a solar eclipse and the later is called a lunar eclipse. The small tilt of the Moon's orbit with respect to the plane of the ecliptic and the small eccentricity of the lunar orbit make such eclipses much less common than they would be otherwise, but partial or total eclipses are actually rather frequent.

 

 

Force To Do!

A stationary object begins to move when it is pushed. Pushing is a force that acts on the ball and makes it move. Force can be applied from the opposite direction to stop a moving ball. Force can also make a moving object go faster, slower or change direction.

The trolley is going down too fast. Applying force from the opposite direction will slow down a moving object. Pushing the trolley in the same direction will make it move faster. Applying a force to the side of the trolley changes its direction.

Force

We can see objects moving or changing shapes every day. Dancing, running, walking even through we talking is involved force!

 

At the end of this topic, we will learn

• What force is
• The effect of force
• What friction is
• The effects of friction
• Ways to reduce and increase friction
• The advantages and disadvantages of friction
• How far an object moves on different surfaces  

 What Is Force ?

All actions involve pushed and pulls. Pushes and pulls are forces. A push is an action of moving an object away. A pull is an action of bringing an object towards us or in the direction we are moving.

The boy slide down because there is a force pulling him

  

This man needs to pull the fishing rod to gt the fish out of the water

Forces cannot be seen but we can feel their effects. For example, we cannot seen wind but we can feel it blowing on our face. We can see the effects of the wind blowing on trees too.