Energy

Answer the following questions for homework:

1. Name one example of each of the four main types of energy.

2. If the mass of a ball is 0.5 kg and the velocity of this ball  is 10 m/s, what is its Kinetic Energy?

3. If a lamp is sitting 1 m off the ground on a table and it has a mass of 10 g, what is its Gravitational Potential Energy?

4. If a system has 484 Joules of Kinetic Energy and 16 Joules of Potential Energy, what is the system’s Mechanical Energy?

5. How does a person follow the Law of Conservation of Energy in everyday life?

Newton’s 3 Laws of Motion

Answer the following questions:

1. How does the inertia of an object depend on the object’s mass?

2. You push your brother/sister on a sled. Together they have a mass of 60 kg. If the Net Force on the sled is 40 N, what is the sled’s acceleration?

3. A car is being towed by a tow truck. What is the car’s mass if the Net Force on the car is 3,000 N and it has an acceleration of 2.0 m/s2?

4. How are weight and mass related? How are they different?

5. At the end of a race, a sprinter with a mass of 85 kg has a speed of 12 m/s. What is the sprinter’s momentum?

6. A baseball thrown by a pitcher has a momentum of 6.5kgm/s. If the baseball’s mass is 0.16 kg, what is the baseball’s speed?

Paper Plane Experiment

Use the following link to see the different paper plane designs you can use for the experiment.

http://srel.uga.edu/kidsdoscience/sci-method-planes/airplane-designs.pdf

Motion & Forces

Answer these questions for homework:

1. What forces are working on a piece of paper that is sitting motionless on your desk? Are these forces balanced or unbalanced?

2. If a person is pushing a couch to the right with a force of 50 N, and another person is pushing the same couch to the left with a force of 40 N, what is the net force on the couch?

3. Name one example (not given in the video) of each type of friction.

4. Give an example of how air resistance is used (or avoided) in a real-life situation.

Motion & Acceleration

Answer the following questions for homework:

1. An elevator travels a distance of 220 m from the first floor to the 60th floor in 27.5 s. What is the elevator’s average speed?

2. You are walking toward the back of a bus that is moving forward with a constant velocity. Describe your motion relative to the bus and relative to a point on the ground.

3. A car travels at an average speed of 30 m/s for 0.8 h. Find the total distance traveled in km.

4. A ball is dropped from a cliff and reaches a speed of 29.4 m/s in 3.0 s. What is the ball’s average acceleration?

5. A sprinter runs with an average acceleration of 4.5 m/s2. What is the sprinter’s speed 2 s after leaving the starting blocks?

Sound & Light

Questions to answer:

1. Explain the different properties of sound.

2. Identify ways sound can be used.

3. Explain why a prism separates white light into different colors.

4. Describe how lenses are used to correct vision problems.

5. Explain how you see color.

Wave that Shook the World

Use the following websites to determine the distance the tsunamis traveled in each scenario. You will have to put in the coordinates in latitude and longitude, which are located on your map.

http://www8.nau.edu/cvm/latlongdist.html

http://www.chemical-ecology.net/java/lat-long.htm

VIDEO: Wave that Shook the World

As a reward for finishing your assignment early or on time, you may watch the destructive power of the tsunamis we were studying in this activity!

Waves

Answer the following questions for homework:

1. Compare and contrast transverse and compressional waves.

2. Describe the relationship between wavelength and frequency.

3. How are a wave’s amplitude and energy related?

4. Why do waves change direction when they enter a new medium?

5. How can waves interfere with each other?

Temperature and Thermal Energy

Answer the following questions for homework:

1. What is -40 F in Celsius?

2. What is the temperature of 22 C in Fahrenheit?

3. What has more thermal energy: a cup of coffee or Lake Erie? WHY?

4. Identify what is scientifically incorrect  about the following statement: “Stop letting all the cold air in!”

5. List the differences between thermal energy, heat and temperature (don’t just write the definitions!).

6. Calculate the specific heat of a metal if 0.5 kg absorbs 9,000 J of thermal energy as it warms by 10 C.