Newton’s
1st Law / 1. The Law of ______: An object at rest tends to stay at rest and an object in motion tends to stay in motion unless acted upon by an unbalanced force.
Basically, an object will “keep doing what it was doing” unless acted on by an unbalanced ______. If the object was sitting still, it will remain stationary. If it was moving at a constant velocity, it will keep moving.
It takes ______ to change the motion of an object. Force = a push or pull on an object
The First Law states that all objects have ______. The more ______ an object has, the more inertia it has (and the harder it is to change its motion). Inertia: the tendency of an object to resist changes in its state of motion.
If objects in motion tend to stay in motion, why don’t moving objects keep moving forever?______.
Examples: A book sliding across a table slows down and stops because of the force of friction. If you throw a ball upwards it will eventually slow down and fall because of the force of gravity.
Newton’s 2nd Law / 2. The Law of ______: The net force of an object is equal to the product of its mass and acceleration, or F=ma. (F=force. m= mass, a=acceleration)
______: a measurement of how quickly an object is changing speed. F = ma
Force is directly proportional to ______ and acceleration.
F = ma basically means that the force of an object comes from its mass and its acceleration.
Something very massive (high mass) that’s changing speed very ______ (low acceleration), like a glacier, can still have great ______.
Something very small (low mass) that’s changing speed very ______ (high acceleration), like a bullet, can still have a great ______. Something very small changing speed very slowly will have a very weak force.
Question 1: What acceleration will result when a 12 N net force applied to a 3 kg object?
Question 2: What acceleration will result when a 12 N net force applied to a 6 kg object?
Question 3: A net force of 16 N causes a mass to accelerate at a rate of 5 m/s2. Determine the mass.
Newton’s 3rd Law / 3. The Law of Reciprocal ______: For every action there is an equal and opposite reaction.
For every force acting on an object, there is an equal force acting in the opposite direction.
Right now, gravity is pulling you ______ in your seat, but Newton’s Third Law says your seat is pushing ______ against you with equal force. This is why you are not moving. There is a balanced force acting on you– gravity pulling down, your seat pushing up.
Sport’s Science- Greatest Hits
Remember :
Force = Mass X Acceleration
Complete the last column on the chart by filling in the lbs of force applied in each of the hits.
Mass / Acceleration / ForceSumo / Huge / Slow / ______
Rampage / Small / Fast / ______
Sledge Hammer / 10 mph / ______
Rugby player / ______
Football player
tackle / 14 mph / ______
Joey Porter
Blind Side / 14 mph / ______
Hockey Check / Hit______
Wall ______
Body Slam / ______
Which Force was the greatest! ______