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→for constant speed/velocity
→for changing speed/velocity

forces
→a push or pull
a force can cause an object to:
a. change direction of an object that is moving
b. cause a stationary object to start moving
c. stop a moving object
d. change the state of an object
e. change the speed of an object (slow is down, fast is up)
push
repulsion
pull
attraction
types of forces
→contact forces
→non contact forces
contact forces
→friction
→tension
→normal reaction
→elastic
→air resistance (drag)
→thrust
→lift
→upthrust
non contact forces
→gravitational
→magnetic
→electrostatic