5/19 do now – on a new sheet• A spark timer is used to record the position of a lab cart

accelerating uniformly from rest. Each 0.10 second, the timer marks a dot on a recording tape to indicate the position of the cart at that instant, as shown.  The linear measurement between t = 0 second to t = 0.30 is 6.0 cm. Calculate the magnitude of the acceleration of the cart during that time interval. [show all work including equation and substitution with number and units.]

                                                                                                                                         

d = vit + ½ at2

6.0 cm = ½ a(0.3s)2

a = 133 cm/s2

Objectives – Regents Review• Test 1

• Mechanics review packet - Quiz on Tuesday 5/20

• Homework: – 5 Castle learning assignments – due 5/26 – quiz on 5/27– Work and energy review packet – quiz on 5/30

• When finished all assignments, you may have extra credit packet

5/20 do now• Mechanics Review Packet Quiz

                                                                                                                                         

Objectives – Regents Review• Test 1 / test 1 correction• Work and energy review packet – quiz on 5/30

• Homework: – 5 Castle learning assignments – due 5/26 – quiz

on 5/27

• When finished all assignments, you may have extra credit packet

• No post tomorrow – make up labs today and Thursday

5/21 do now• Newton’s 1st law (aka the law of inertia) says that an

object will remain its state of motion unless acted on by an unbalanced force.

1. What does inertia mean?

2. How is inertia related to mass?

3. What is the state of motion?

4. What is force?

5. What is unbalanced force?

Inertia: the resistance an object has to a change in its state of motion.

Mass is the measure of amount of inertia. More mass, more inertia.

Mass is the measure of amount of inertia. More mass, more inertia.

The state of motion of an object is defined by its velocity - the speed with a direction.

Unbalance force is the net force. Net force causes acceleration or change in state of motion.

Objectives – Regents Review• Give back mechanics quiz – you may retake during

post.

• Test 1 correction / Test 2• Work and energy review packet – quiz on 5/30

• T-shirt money is due tomorrow - $8.00

• Homework: – 5 Castle learning assignments – due 5/26 – quiz

on 5/27

• No post today – make up labs Tomorrow

5-22 Objectives• State assessment, no questions.

• T-shirt money is due tomorrow - $8.00

• Homework: – 5 Castle learning assignments – due 5/26 – quiz

on 5/27– Work and energy review packet – quiz on 5/30

• Last day to make up labs

• Test 1 correction / Test 2

5/27 do now

• Castle learning quiz

Objectives• Test 1C/Tests correction – please, please ask for help if you have

questions!!!!• Work and energy review packet, to be collected – quiz on 5/30

• TOMORROW is last day for T-shirt money - $8.00

• Homework: – 5 Castle learning assignments – REVIEW FOR FINAL - due 6/3– Essay – due 6/5 – 10% of 4th quarter grade

• FINAL EXAM: 6/4 7:30am - 8:50am, bring calculator, ruler, protractor

• Return your text books.

• You may retake quizzes during post – grade is averaged

• Extended Post Session Review This Week – Wednesday and Friday – 2:00 – 4:00.

5/28 do now1. Define Newton’s 2nd Law

2. What does force mean?

3. What is the meaning of net force?

4. What is the definition of acceleration?

The direction of acceleration of an object is in the same direction as the net force. The magnitude of acceleration of an object is directly proportional to its net force and inversely proportional to its mass.

Net force, also known as unbalanced force, is the sum of all forces. Net force causes acceleration.

A force is a push or pull upon an object resulting from the object's interaction with another object.

Acceleration is defined as change of velocity over time. Acceleration is caused by net force.

5/30 do now – on a new sheet1. Newton’s second law predicts the relationship that acceleration will

have with the net force for a given mass. Explain this relationship by writing the formula and then explaining if there is a direct or inverse relationship between the force and the acceleration (1 pt), what happens to the acceleration if the mass changes (1 pt), and then explain what conditions must be necessary for equilibrium to exist in the system (1 pt).

2. Give two examples of mechanical waves and describe if they are longitudinal or transverse (2 pts). Explain at least two similarities between mechanical waves and electromagnetic waves (2 pts) and describe at least one difference (1 pt).

Acceleration is inversely proportional to mass. In order for an object to stay in equilibrium, Fnet must be zero.m

Fa net

Both sound and stadium wave are mechanical waves. Sound wave is a longitudinal wave and stadium wave is a transverse wave. Both mechanical wave and electromagnetic wave transfer energy, but mechanical wave can only propagate through matter, electromagnetic wave can travel through vacuum and matter.