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Newton’s Second Law Notes

Follow along with the PowerPoint slides to learn how net force, mass, and acceleration are related.

List your different objects:

|Objects |Rank |

|1. | |

|2. | |

|3. | |

|4. | |

|5. | |

Write your answers to the questions in the PowerPoint in complete sentences here:

There is math that explains this!

Acceleration = _____________________________________

This means that if…

o The net force ___________, acceleration will _______________

▪ If there is the same mass and the force doubles, acceleration will _______________

o the mass ______________, acceleration will _______________

▪ If there is the same force and mass doubles, acceleration drops by ______________

Newton’s Second Law –

• We rewrite the formula as Net Force = __________ x _______________ to get rid of the division

o Fnet = ____________

▪ Fnet=_____________

▪ M=______________

▪ A=_______________

• To use this formula properly, we need to make sure we have the correct units.

o We measure force in __________ (N), mass in ___________ (kg), and acceleration in _______________________ (m/s2)

Write Newton’s Second Law of Motion:

Example Problems:

1. What is the net force required to make an object with a mass of 30 kg accelerate at 2 m/s2 to the right?

2. What if we want to accelerate it to 6 m/s2 to the right?

3. What is the net force required to make an object with a mass of 10 kg accelerate at 2 m/s2 to the right?

4. What is the net force required to make an object with a mass of 10 kg accelerate at 2 m/s2 to the right?

Check Your Understanding:

1. If you apply the same net force to an elephant and a golf ball, which object will accelerate more? Why?

2. If you increase the force on an object, will it accelerate more or less? Why?

3. If there are no forces acting on an object, can you conclude that it is not moving? WHY?

4. If an object is not moving, does that mean there are no forces acting on it? WHY?

5. Can an object go around a corner with no forces acting on it? Explain.

6. If the net force acting on a sliding block is tripled, how does the acceleration change?

7. If the mass of a sliding block is tripled while a constant net force is applied, how does the acceleration change?

8. If the mass of a sliding block is tripled at the same time the net force on it is tripled, how does the resulting acceleration compare to the original acceleration?

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