Monday (11 Oct):

Journal: What are the action / reaction pairs:

Ball in the air

Club hitting a ball

Book on a table

  Newton's 3rd law always involves two objects and the interaction between them (equal and opposite force).

L #11:  1- 4, 9, 11,  13, 15, 18 Due Today Mon 11 Oct (Newton's 2nd & 3rd)

Tues 12 Oct Lab#5: Unknown Mass

L #14:  1- 3, 5, 10, 11, 14 Due  Wed 13 Oct  (Free Body)  

Thurs 14 Oct:

Re-View for Test tomorrow on Newton's Laws

Fri 15 Oct: Test Newton's Laws

& L #  7, 8, 10, 11, 14

L #9: 1- 8,  11-16    Due Mon 18 Oct (Torque)

L #12: 1- 14,  16, 17    Due Wed 20 Oct (Work & Power)

L #13: 1- 13,  18, 19    Due Friday 22 Oct (Instantaneous Vel & Acc)

Acceleration is Change of Velocity over time;

a = DV / t

F_net = ma

a = DV / t     or   (V₂ - V₁)/ t

 SLOPE on a Vt Graph

Spot-Quiz: 2nd Law

                                                                        Name_______________________ Pd____

Show work!!!

1. What is the magnitude of the force needed to accelerate a 250 kg cart from rest to

5 m/s in 2.0 s?

2. If the weight of an object is 20N and floor of an elevator causes a vertical acceleration is 5.0 m/s², what is the object’s apparent weight (normal force on the object)?

3. A 3-kg book is being pulled to the left with a force of 10.0N.

Kinetic Friction is 2.5N.       Do the following:

a.       Find the Acceleration of the book

b.      Draw a free body diagram of the book

c.       Find m

1.        What is the magnitude of the force needed to accelerate a 250 kg cart from rest to 5 m/s in 2.0 s?

                                    F_net = ma  à mDv/t à (250)(5/2) = 625N

2.        If the weight of an object is 20N and floor of an elevator causes a vertical acceleration is 5.0 m/s², what is the object’s apparent weight (normal force on the object)?

                               F_net = ma  à mDv/t à (2)(5) = 10N + 20 = 30N

3.        A 3-kg book is being pulled to the left with a force of 10.0N.

Kinetic Friction is 2.5N.       Do the following:

1. Find the Acceleration of the book

F_net = ma         

                                                                         7.5  =  3a

                                                a = 2.5m/s²      

2. Draw a free body diagram of the book

                      N = 30N

                                                                        F_{K =} 2.5                        T =10N

                                                                                                 W = 30N

3. Find m

F_K =  mN                                    

                                                10  =  m 30

                                                m = .333         

Paper: Newton’s Laws, Free Body Diagrams & Motion Graphs:

• (Type your own paper) All typing must be your own. You may use graphs from the internet, but words, problems & explanations must be your own typing.
• Due Fri 16 Oct.

Newtons 1^st Law:

1.      What is 1^st Law? Explain 1^st Law in your own words and what it means.

2.      Make two problems using 1^st Law and show work/explain your answer.

Newtons 2^nd Law:

1.      What is 2^nd  Law? Explain 2^nd  Law in your own words and what it means.

2.      Make two problems using 2^nd  Law and show work/explain your answer.

Newtons 3rd Law:

1.      What is 3^rd Law? Explain 3^rd  Law in your own words and what it means.

2.      Make two problems using 3^rd  Law and show work/explain your answer.

Free Body Diagram:

1.      What is a Free Body Diagram? Explain how it relates to Newton’s Laws.

2.      Make two Free Body Diagram problems (one without acceleration and one with acceleration). Explain your diagram.

 Motion Diagram:

1.      Make two Motion Graphs (Position vs time & Velocity vs time).

2.      Make  two problems for each graph.

3.      Show work/explain your answer