Sarah Benson

Newton’s first law states that an object in motion will continue in motion in the same direction and speed unless an unbalanced force acts against it. This is also called the law of inertia. Inertia means that when you’re in motion you continue in the same direction and speed.

One example of Inertia and the first law is a seat belt. When you are in the car and you hit something, your body automatically continues to move forward. The seat belt however, stops your body from going out of the window and acts as the “unbalanced force.”

When you kick a soccer ball, the automatic reaction of the ball is to keep moving in the same direction and speed, however because of friction and gravity which work against the ball and inertia, the ball slows to a stop. Gravity Example: Kick Gravity Makes it go down

Newton’s second law states that “Acceleration of an object by a force proportional to the mass of the object and directly pr0portional to force applied.

Building a snowman is an example of the 2 nd law because it takes a lot more force to roll the bottom and middle of the body than the head. The reason it takes a lot more force is because the bottom two spheres have more mass, therefore you have to exert a lot more force to move them.

Another example of Newton’s second law of motion is the comparison of the force needed to roll a cement ball down a hill to a rubber ball, or a kickball. Because the cement ball has more mass than the kickball, it would take more force to make it go at the same acceleration as a kickball. 20 N

The 3 rd law of motion says that for every action, there is an equal and opposite reaction.

A rocket is an example of the 3 rd law because as the air/gasses are released from the rocket, the pressure forces the rocket upwards. Reaction: the rocket gets forced upwards. pressure builds and gasses are released

Another example is our lab with the balloon. We put a straw on a string and taped an untied balloon to it. Before releasing the balloon, we had one person hold one end of the string and the other end was attached to the cabinet. The action was the release of air from the balloon. The reaction was the balloon going up the string.

PowerPoint clip art Dearman, jennifer. “Notes over force and Motion.” truett Wilson Middle School