Complete this week’s CRCT warm-ups. The worksheet will be collected today so be sure your name is on the worksheet.

16.Gravitational force between two masses ______ as the distance between the masses decreases and rapidly ______ as the distance between the masses increases.

A. increases, increases B. decreases, decreasesC. decreases, increases D. increases, decreases

17. Two forces are acting on an object, but the net force on the object is 0 N. For the net force to be 0 N, all the forces on the object must cancel. What must be true for the two forces on the object to cancel?

A. The forces are the same size and in the same direction.B. The forces are different sizes and in the same direction.C. The forces are the same size and in opposite directions.D. The forces are different sizes and in opposite directions.

18.Which of the following always causes change in speed, direction, or both?

A. balanced forces B. unbalanced forcesC. either balanced or unbalanced forcesD. more than three forces

19.During a space shuttle launch, about 830,000 kg of fuel is burned in 8 min. The fuel provides the shuttle with a constant thrust, or forward force. How does Newton’s second law of motion explain why the shuttle’s acceleration increases as the fuel is burned?

 

20.Suppose you are standing on a skateboard or on in-line skates and you toss a backpack full of heavy books toward your friend. What do you think will happen to you? Explain your answer in terms of Newton’s third law of motion.

 

Fan-n-PickStudent #1 – Fans the cards face down

Student #2 – Picks a card and read the question; pass card to student #4

Student #3 – Answers the question

Student #4 – Praise if correct or tutor if wrong

Rotate positions; repeat until all twelve cards are used!

S8P4. Students will explore the wave nature of sound and electromagnetic radiation.

f. Diagram the parts of the wave and explain how the parts are affected by changes in amplitude and pitch.

What characteristic of a wave – wavelength,

amplitude, or frequency – make a tsunami so

destructive?http://www.cnn.com/

Cause rhythmic disturbances in a medium

Travel through a mediumTransmit energyLeave the medium unchanged.

2. An ocean wave has a length of 10.0 m. Two waves pass a fixed point every 1.0 s. What is the speed of the wave? (Hint: Determine the frequency of the wave first.)

2 waves = 2 hertz 1.0 s

2. An ocean wave has a length of 10.0 m. Two waves pass a fixed point every 1.0 s. What is the speed of the wave? (Hint: Determine the frequency of the wave first.)

Find: ________ Formula: ___________________Given: Apply & Solve

Characteristics of a Compressional or Longitudinal Wave

Compression – crowded or dense area

Rarefaction – less dense or spread out area

Characteristics of a Compressional or Longitudinal Wave

Wave Cycle – one compression and one rarefaction

Characteristics of a Compressional or Longitudinal Wave

Wavelength – distance between two compressions

Characteristics of a Compressional or Longitudinal Wave

Amplitude – measure of the amount of compression; depends on the amount of energy being transferred

Characteristics of a Compressional or Longitudinal Wave

Frequency – number of compressions that pass a stationary point in one second

Find a partner. Use your notes and your brains to complete the mechanical wave map.

Work with your cooperative team to create the best map

comparing transverse and longitudinal waves!