forces
contact forces
non contact forces
electrostatic
gravity
magnetism
push
pull
twist
normall
friction
b. Friction is the force that opposes motion between any surfaces that are in contact. There are four types of friction: static, sliding, rolling, and fluid friction.
c. sliding a piece of paper on a table
a.Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
d. 
b. A force that twists something is called torsion. The shape of the twisted object can also be called torsion, like the torsion of a tree's branches that makes it tricky to build a treehouse. In physics, you can calculate torsion using a formula.
a. twist is the force of going left or right in a circular motion.
c. an example would be to open a jar: you hand would be going around clockwise or anticlockwise while twisting.
d. 
b. pushing is all around us: hitting a ball, throwing, pushing something away from you.
c. pushing a balloon in a bucket of water.
a. push is when one object runs into another object and makes it move forward or left and right.
d. 
b. normal means any object not moving, even people can be a normal force: standing still or in a pose.
c. normal is anything not moving such as a book on a table, a piece of paper on a table. carpet on the floor.
a.The normal force is the support force exerted upon an object that is in contact with another stable object. For example, if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book.
d. 
b.An example of a pull force might be gravity itself, and how gravity pulls objects downward toward the earth's surface. Forces have the ability to change the speed or even the direction of an object.
c. pulling someones hair
a. A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects.
d. 
b. All magnets have three characteristics: they both draw other elements, they have north and south poles, and two of the same poles repel each other, while opposite poles pull each other.
c. collecting paperclips with a magnet.
a. Magnetism is a physical force dominated by magnetic fields, attracted to the north and south poles of the magnet by certain materials.
d. 
b. from rubbing a balloon on your hair or woolen fabric, the hair will lift up and try to attach itself to the balloon, just like how a magnet connects to another magnet.
c. rubbing a balloon on hair
a. Electric forces are very large, far greater than the force of gravity. Unlike gravity, there are two types of electric charge, (whereas there is only one type of gravity; gravity only attracts). Like charges repel. Unlike charges attract.
d. 
a. Gravity is an attractive force which exists in any two masses.
b. if a piece of peanut butter had the same density as the sun, they would have the same gravitational force.
c. rolling a ball down a book.
d. 
e.observation: i have learnt that a twist is called torsion.
e. i have learnt that push is anything that hits another object.
e.i have learnt that pull can be gravity because it pulls object towards the earth.