Gravity
Gravity is all about the earth pull us downwards.
Example:
- Your apple fall. It always fall downwards, it never fall upwards.
- You kick a ball, the ball will also go down again it will never fly.
- You try to jump as high as you can, and you will go back to the ground.
Gravity is also useful.
Example:
- Gravity helps us whenever we want to slide or roll anything down a slope.
- Every time we weigh something, we are really measuring how hard gravity pulls it down.
- Gravity also makes rain and snow fall to the earth's surface.
- Then because of gravity, water from the rain and melted snow sinks into the ground or runs downhill into streams and lake.
Frictional Force
Frictional force is a force that make objects stop or slow down.
You can find under your shoes its look like a mountain that make you slow down or stop easier.
Example of frictional force:
- your bike wheel
- your shoes
- car
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