8.3 Scientific Investigation and Reasoning. The student uses critical thinking, scientific reasoning, and problem solving to make informed decisions and knows the contributions of relevant scientists. The student is expected to:
(D) relate the impact of research on scientific thought and society, including the history of science and contributions of scientists as related to the content.
8.6 Force, motion, and energy. The student knows that there is a relationship between force, motion, and energy. The student is expected to:
(C) investigate and describe applications of Newton’s law of inertia, law of force and acceleration, and law of action-reaction such as in vehicle restraints, sports activities, amusement park rides, Earth’s tectonic activities*, and rocket launches.
car suddenly stops and you strain against the seat belt because our bodies want to keep moving
when riding a horse, the horse suddenly stops and
you fly over its head
the difficulty of pushing a dead car
car turns left and you appear to slide to the right
ketchup stays in the bottom (at rest) until you bang (outside force) on the end of the bottom
a headrest in a car prevents whiplash injuries during a rear-end collision (your head goes forward and then jerks backward)
Newtons’s 1 st Law and You Don’t let this be you. Wear seat belts. Because of inertia, objects (including you) resist changes in their motion. When the car going 80 km/hour is stopped by the brick wall, your body keeps moving at 80 m/hour.
Newton’s 2 nd Law F = m x a Force= mass x acceleration
Second law: The greater the force applied to an object, the more the object will accelerate . It takes more force to accelerate an object with a lot of mass than to accelerate something with very little mass.
Newton's Laws of Motion The player in black had more acceleration thus he hit with a greater amount of force
3 rd Law Reaction of a rocket. Fuels are burned in the engine, producing hot gases. The hot gases push against the inside tube of the rocket and escape out the bottom of the tube. As the gases move downward, the rocket moves in the opposite direction.