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Forces, Forces ( Contact and Non-Contact ), Electrostatic, image, image,…
Forces
Contact Forces
Twist
Twist is a force that is the movement of twisting an object. An example of this is twisting a wet towel to get the water out. 
Push
Push is a contact force that makes an object or obstacle move all directions, excepting towards you. Gravity can also make this force a non contact force. This is because gravity can push the object in a certain way.
Friction
friction is a force between two forces that are sliding (or trying to). for example, pushing a book across the ground, friction makes this difficult. Here is a picture showing an example of friction.
Normal
Normal is a force that prevents objects falling from a surface of floor. For example, if normal force didn't exist, then books would all fall through tables and then through the ground.
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Pull
Pull is a contact force that pulls something (usually an object) towards you. An example of the pull force is pulling a door towards you. It has nowhere to go and your strength pulls it in your direction.
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Non-Contact Forces
Gravity
Gravity is a force between two masses or objects, particles, etc. On earth, gravity gives weight to physical objects and also causes the oceans tides. Below is a picture giving an example of gravity.
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Magnetism is a non-contact force that can pull or push away another of the same thing that have a magnetic material like iron inside them. Here is a picture of what this could look like.
Static electricity happens when there is a build up of the electrons on a wall or something, giving it an electric charge. The electrons will be engaged to something with less electric charge, so they'll move to an object that has fewer electrons.
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PUSH:
1. You hit a ball with a bat. What factors will influence how far the ball will go?
There are two factors. One, the angle of the hit. This is because if you hit the ball on a down angle, it will hit the ground and maybe only go a few centimetres or metres. The other one is the speed of the bat. If you hit it fast, it is much more likely to travel faster.
2. What mechanical forces systems use a push force?