Therefore, we can write: We can use this to calculate the force that the trampoline is exerting on the friends: This is above the threshold of 5000 N, so the trampoline does break. Solid – definite shape; definite volume Tightly knit particles with very high relative density Liquid – no definite shape; definite volume Particles starting to spread out; high density Gas – no definite shape; no definite volume Particles very far apart; low density. Conservation of Energy - AP Physics 1. A group of ten friends, each of mass 50kg, want to test the strength of a trampoline. 2-4 Enrich, page 22 Vegetarians do not consume red meats or seafood (and possibly eggs) and may need an additional source of iron. 482 F, 250 C, 523 K 6. The solution contained three different liquids because three distinct boiling points were observed. Energy in a system must be conserved, and the energy in the falling pebble is either potential or kinetic: Potential energy is represented by the terms.
The tree also undergoes physical changes on a macroscopic scale. What is its speed before it hits the ground? Hand them the worksheet they missed and be done with it! The water and nutrients are chemically altered. A plant converting sunlight into food - chemical c. Burning wood in a fireplace - chemical d. Melting snow - physical e. Baking a cake - chemical f. Crushing rock - physical. The kinetic energy of molecules decreases ~ from gases to liquids to solids. Work and energy reinforcement worksheet answers.com. Each time the ball bounces, 10% of the kinetic energy is lost. Physical changes: melting butter, wheat being ground into flour, cracking the egg, breaking bowl Chemical changes: lighting the gas in the oven, wheat converting energy from the sun, paper towel burning 2-3 Apply, page 17 1. Essential Variable Sheet - We always hope that students will memorize variables, but it is asking a lot. The sugar in sugar water can be removed by crystallization.
Some of them are full of information, but this is how much I had to cover per day (and I had to hurry to finish). Separating sand from water can be done by filtration. 6. a. Ca - Calcium a. Before mixing, the two liquids filled each graduated cylinder completely. We'll go through both methods, as you should be comfortable using either one, as some problems won't have the ability to be easily solved using two different methods. Therefore, it is impossible to make gold by reacting other elements. Thus, not all mixtures are solutions. Heterogeneous mixtures are often separated by filtration. The substance is probably a salt. Work and energy reinforcement worksheet answers kalvi tv. Worksheets are listed in the order I used them (and wrote them) and begin at the bottom of the page (Ch 16). Chapters 20 and 21 - Chemical Reactions - back to top. No, because it becomes more and more difficult to remove heat from supercooled atoms. Included here are four foldable mini books (and identical reading passages) that cover motion, acceleration, speed, work, potential & kinetic energy, types of energy, newton's laws of motion, and types of forces - gravity, friction, etc.
We can use the expression for conservation of energy to calculate the velocity as they hit the trampoline. As it cools, the vapor condenses and drips into the collection flask as a liquid. The energies involved in this problem are kinetic and potential energy. However, the idea behind this is to reduce calculation errors. For example, the water, carbon dioxide, and nutrients absorbed by the plant are chemically rearranged to form the living material of the plant cells. 6 F. Albert reversed the units. Gas and plasma are the other two states of matter. They all land on the trampoline at the same time and decelerate at a constant rate to a point of zero velocity over a period of 0. More information is needed to solve. Work and energy reinforcement worksheet answers filetype pdf. The experiment does not include measuring the water the tree uses, the nutrients it consumes, or the carbon dioxide it absorbs. Absolute zero is the temperature at which atoms would stop moving entirely. The answer should be a K, or -273 C. \ 4. Milk appears homogeneous until the milk is allowed to separate from the fat (cream).
'F Boiling - - 212' -- - - 100' - - - - - -373 --68' - - 32' ------- 0 ----- - -273 'C --20' K --310 Normal Body Temperature - 293 Room Temperature 5. To solve this problem, we'll need to consider the initial energy of the block. Fossil fuels are an example of potential energy. E. Aluminum- element (pure) f. Table Salt – compound (pure). Other crap in it besides water! ) Coal and oil are limited resources. A 50kg block is released from its resting position at a height of 10m from the ground. It was dissolved in the original solution and could not be seen.
A magnet could be used to separate them because iron is attracted to a magnet but aluminum is not. Make sure that their answers reveal the understanding that physical changes do not alter the identity of a substance and that chemical changes, such as burning, digesting, and rusting, do involve the formation of a new substance. Pb, plumbum 38 Chapter 2 Prentice-Hall, Inc, 4.