## Second Law of Motion

The net force on an object equals its mass times its acceleration.

Once they are in motion, which which is easier to stop a bowling ball or a marble?

What is the relationship between force, mass, and acceleration?

Accelerated motion accounts for the fact that if two skate boarders use the same force to fall down the ramp the one with less mass accelerates faster than the one with more mass.  Remember mass is not the same as weight.

A car with more mass requires a larger force to to accelerated than one with less mass.

Does a Ford Explorer require more or less force to accelerate at the same rate as a Honda Accord?

Newton's second law of motion is expressed by the formulae:

force = mass X acceleration

acceleration = force/mass

Momentum changes with changes in mass or velocity.

Momentum is expressed by the formula:
force = mass X acceleration

### Set...

Review the following information and take the quiz.

### Go...

Read through this exercise and list your predictions on the lesson inquiry.

#### Newton's 2nd Law in action --

Complete the Rocket Lab.

Debrief the lab results with your class, or e-mail a debreifing the lab to your instructor.

What suprised you?

Which balloon traveled the fastest (small, medium, or Large)?

Why?

If ,all or part of, the experiment failed what happened?

What connections can be made with airplanes or rocket engines?

#### Done Early...

Develop a model to illustrate the force needed to keep an object moving in a circle.

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