Author:
Michele Langhans

Students will be able to determine the relationship between forces, mass, and the motion of objects. They will also demonstrate and explain the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction. Students will determine the relationships among force, mass, and motion. Finally, students will apply Newton’s Laws to everyday experiences.

Be sure to put a star beside notes that you are not sure about.

Tutorial

Notes on Newton's 2nd Law of Motion

Source: Langhans and various other educators

1. Newton’s Second Law describes the relationship between _________________, _______________, and _______________.

2. Force and ________________ are directly related. If mass is kept the same, when _________________ increases, then acceleration __________________. Also, if one decreases the other _______________.

3. Acceleration and mass are ________________ related. If force is kept constant, when mass increases, then acceleration ________________. On the other hand, when mass decreases, acceleration ________________.

4. Newton’s Second Law can be summarized with the following equation:

5. A person with a parachute falls at towards the earth after jumping from a plane. What forces are acting on the parachuter? (List them and draw the force diagram)

6. A duck floats on water. What forces are acting on it? (List them and draw the force diagram).

7. If you increase the mass of an object, while keeping the force constant, the object’s acceleration will ___________________.

- If you increase the force applied to an object, while keeping the mass constant, the object’s acceleration will ___________________.
- Explain the relationship that exists between force and mass.
- Explain the relationship that exists between force and acceleration.

11. Explain the relationship that exists between acceleration and mass.

12. A child pulls an 8.5kg wagon with a force of 12N. If the frictional force on the cart is 9N, what is the acceleration of the wagon?

13. A person rides a cart that is being pushed by a friend. If the person and the cart accelerate at 0.3m/s^{2} and the friend pushes with a force of 25N, what is the combined mass of the student and the cart? (Neglect friction.)

14. A person rides a cart that is being pushed by a friend. If the person and the cart accelerate at 0.6m/s^{2} and the friend pushes with a force of 27N, if the frictional force is 4N, what is the combined mass of the student and the cart?

15. Two 5N forces are acting due west on an object while another force of 3N acts due east. What is the acceleration of the object if it has a mass of 4kg?

Source: Langhans