Choose all of the examples of balanced forces.
Responses
A A chandelier has been hanging in the kitchen for yearsA chandelier has been hanging in the kitchen for years
B A log floats on top of the lakeA log floats on top of the lake
C You place your book on the top of a flat tableYou place your book on the top of a flat table
D Your wagon rolls down the hillYour wagon rolls down the hill
E The wind blows and turns the turbines of a windmill.The wind blows and turns the turbines of a windmill.
B
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Choose all of the examples of balanced forces.
Responses
A A chandelier has been hanging in the kitchen for yearsA chandelier has been hanging in the kitchen for years
B A log floats on top of the lakeA log floats on top of the lake
C You place your book on the top of a flat tableYou place your book on the top of a flat table
D Your wagon rolls down the hillYour wagon rolls down the hill
E The wind blows and turns the turbines of a windmill.
B, C, E
Review the student data recorded the data table. All BUT ONE statement is true regarding the student data.
Responses
A The students collected all qualitative data during their experimentation.The students collected all qualitative data during their experimentation.
B There was no chemical reaction when copper was added to the hydrochloric acid.There was no chemical reaction when copper was added to the hydrochloric acid.
C In each case during the occurrence of a chemical reaction, the metal disappeared.In each case during the occurrence of a chemical reaction, the metal disappeared.
D The key evidence for the occurrence of a chemical reaction in these experiments is the production of hydrogen gas.
D
Ms. Brown commented on the student data saying that although they demonstrated several chemical reactions, they did not model the conservation of matter in any of the four experiments. Kai and Maria are about to add 3 grams of magnesium (Mg) to a test tube of 30 grams of hydrochloric acid (HCl). How could you adapt the experimental design so Kai and Maria would be demonstrating the law of conservation of matter? One technique is NOT appropriate.
Responses
A The mass of the balloon must be included in the before and after measurements.The mass of the balloon must be included in the before and after measurements.
B All masses must be recorded before and after the reaction, including the mass of the test tube.All masses must be recorded before and after the reaction, including the mass of the test tube.
C The students must capture the gas produced by covering the end of the test tube with a balloon.The students must capture the gas produced by covering the end of the test tube with a balloon.
D The students should measure the diameter of the balloon once the chemical reaction has stopped.
D
When you graph collected data, it is sometimes easier to visualize relationships between variables. Describe the relationship depicted the the electromagnetic data.
Responses
A The strength of the electromagnet is dependent on battery size and coils of wire.The strength of the electromagnet is dependent on battery size and coils of wire.
B As the coils of wire were increased around the nail, the strength of the electromagnet increased.As the coils of wire were increased around the nail, the strength of the electromagnet increased.
C There is a direct relationship between the number of clips picked up and the size of the electromagnet.There is a direct relationship between the number of clips picked up and the size of the electromagnet.
D There is an inverse relationship between the manipulated variable, coils of wire, and the responding variable, number of clips picked up.
B
To determine if a force is balanced, we need to examine whether the forces acting on an object cancel each other out. If the net force is equal to zero, then the forces are balanced. Let's analyze each example:
A) A chandelier hanging in the kitchen: Although it has been hanging for years, this example does not provide any information about the forces acting on it. Therefore, we cannot determine if the forces are balanced or not.
B) A log floating on top of the lake: In this case, the log is floating, which means that the upward buoyant force from the water is equal in magnitude to the downward gravitational force on the log. These forces are balanced, so this example represents balanced forces.
C) Placing a book on a flat table: When you place a book on a flat table, the weight of the book (the force due to gravity) is balanced by the normal force exerted by the table. So, this example represents balanced forces.
D) A wagon rolling down the hill: Rolling down the hill indicates the presence of an unbalanced force (gravity). Therefore, this example does not represent balanced forces.
E) Wind turns the turbines of a windmill: The wind blowing and turning the turbines of a windmill generate an unbalanced force. As long as the wind is blowing, the turbines will continue to rotate. Thus, this example does not represent balanced forces.
Based on the analysis, the examples of balanced forces are B (a log floats on top of the lake) and C (placing a book on a flat table).