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The strength or energy as an attribute of physical action or movement.
EX: The direction of the force of gravity is downwards towards the centre of the Earth. As mentioned earlier when two objects interact they exert equal and opposite forces.
http://www.passmyexams.co.uk/GCSE/physics/forces-and-motion.html

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Speed is a way of measuring how quickly something is moving or being done, or something moving fast
EX: An example of speed is how quickly a jaguar runs.
http://www.yourdictionary.com/speed

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Velocity is changing, you can calculate acceleration even though the speed is constant. Acceleration is not dependent on a change in speed. The second point involves the term deceleration, commonly used to mean slowing down.
EX: Speed is a constant 40 km/hr, but velocity changes every time you change direction.
http://study.com/academy/lesson/acceleration-definition-equation-and-examples.html

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The action or process of moving or being moved
EX:The first law of motion states that an object will not change its speed or direction unless an unbalanced force affects it
https://www.google.com/search?safe=active&rlz=1CADEAC_enUS759&q=motion%20definition&oq=motion%20&gs_l=psy-ab.3.1.0i67k1l4.30699.32350.0.34808.8.8.0.0.0.0.150.1006.0j8.8.0....0...1.1.64.psy-ab..0.8.990...0.1vm7DsVTGYU

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In either situation motion is when an object changes position compared to a reference point. Not all reference points have to be standing still.
EX: is moving is when you look out the window of a car and notice that you are moving faster than the car next to you.

http://www.westerville.k12.oh.us/userfiles/4170/Classes/5610/Measuring%20Motion%20HW%202013.pdf

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The force exerted by each person is equal, but they are pushing in opposite directions, in this case together.
EX: The force that each of you is exerting is equal, the two forces cancel each other out and the resulting force is zero.
http://utahscience.oremjr.alpine.k12.ut.us/sciber99/8th/forces/sciber/forces.htm

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The sum of all forces acting on an object.
Ex: two things pulling or pushing with the same force
https://www.mansfieldct.org/Schools/MMS/staff/hand/lawsunbalancedforce.htm

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The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval
EX:the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.
http://study.com/academy/lesson/calculating-average-speed-formula-practice-problems.html

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Is the friction that exists between a stationary object and the surface on which it's resting.
Ex: A frictional force occurs when you try to push an object alongside a surface.
http://study.com/academy/lesson/static-friction-definition-formula-examples.html

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The force exerted on an object in motion that opposes the object as it slides on another object.
Ex: Rubbing both hands together to create heat

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a surface resistance to relative motion, as of a body sliding or rolling.
Ex: Skis sliding against snow
http://www.dictionary.com/browse/friction