Gravitational Energy using Gizmos
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- Bethanie Hensley
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1 Name: Date: Gravitational Energy using Gizmos Using your Gizmo app, open the Potential energy on shelves Gizmo Vocabulary: gravitational energy, Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Look at divers A and B in the picture at left. Which diver had to put the most effort into climbing to the top of his board? Explain. 2. Which diver do you think will make the biggest splash? Explain. Gizmo Warm-up It takes energy to climb up to the top of a diving board, and of course a diver that leaps off the board and makes a big splash in the water also has a lot of energy. But how much energy does a diver have while he is standing at the top of the diving board? Even at the top of the board, the diver has energy a type of energy called gravitational energy. Gravitational energy is the energy an object has because of its position in a gravitational field. Using the Potential Energy on Shelves Gizmo, you will discover how gravity gives objects energy because of their position above the floor. 1. Which object on the SIMULATION pane most likely has the least gravitational energy? Why? Activity A: Factors affecting E g Select the BAR CHART tab and turn on Show numerical values. Introduction: Because gravity pulls objects down to Earth s surface, objects lifted above Earth s surface have energy stored as gravitational energy, or E g. The gizmo labels this PE. Question: What factors affect how much gravitational energy an object has?
2 1. Identify: Circle the factors below that you think affect an object s gravitational energy. mass vertical position velocity horizontal position 2. Observe: Drag the ball to the 1-m shelf on the SIMULATION pane. A. What is the ball s E g (the gizmo calls it PE)? B. Move the ball to the 2-m shelf. What is its E g now? C. What do you think the ball s potential energy will be on the 3-m shelf? The 4-m shelf? PE on 3-m shelf: PE on 4-m shelf: Use the Gizmo to check your answers. (Click the control on the bar graph to zoom out.) 3. Summarize: What is the relationship between an object s height above the ground and its gravitational energy? 4. Describe: Move the ball from side to side (left to right) while trying to keep it at the same height. How does changing the horizontal position of the ball affect its potential energy? 5. Infer: Place the ball and the paper on the same shelf. A. Which object has more gravitational energy E g? B. Why do you think their E g values are different? Activity B: Factors affecting E g Select the BAR CHART tab and turn on Show numerical values. The masses of the objects appear below. object Mass (g) Paper 8.2 Paper clips 39.8 Ball 100 Complete the table below using the values in the bar chart. Object Shelf Eg (Joules) Paper 1 Paper clips 1
3 Ball 1 Paper 4 Paper clips 4 Ball 4 How do the Eg values differ for the objects when they are on the same shelf? What causes this difference in Eg? What similarities do you notice for all of the objects when they are moved from shelf 1 to shelf 4? 6. Identify: What two factors affect how much gravitational energy an object has? 1. Predict: What do you think would happen to the ball s gravitational energy if it is knocked off the shelf and falls to the floor? 2. Think and discuss: Objects in motion have kinetic energy. As objects fall, their potential energy is converted into kinetic energy through work. How much kinetic energy do you think the ball would have just before it hit the floor if it were dropped from a 2-m shelf? Explain your answer.
4 Name: Date: Gravitational Energy using Calculations & a Gizmo Using your Gizmo app, open the Potential energy on shelves Gizmo Vocabulary: gravitational energy, work NOTE: The gizmo labels Eg as PE, sad but true. Activity B: Calculating E g You will need a calculator to complete this activity. Introduction: An object s gravitational energy depends on two factors: its height (h) and its weight (w). The equation for gravitational energy (Eg) is: Eg = w h Goal: Use the gravitational energy equation to determine the weight, mass, and gravitational energy of various objects. 1. Record: Position all three objects on the 1-m shelf and fill in the third column of the table. Object Height (m) Eg (J or N m) Weight (N) Ball Clips Paper 2. Calculate: For each object, substitute the values you know into the gravitational energy (Eg) equation to solve for weight. Record each object s weight in the fourth column. 3. Predict: Suppose the clips were placed on the 5-m shelf. What would their gravitational energy be? (Show your work.) Use the Gizmo to check your answer. 4. Calculate: An object s weight is determined by its mass (m) and the acceleration due to gravity (g) affecting that object: w = mg. On Earth, g = 9.8 m/s 2. A. What are the masses (in kilograms) of the three objects on the Gizmo? (Note: 1 N = 1 kg m/s 2 ) Ball: Clips: Paper: B. Suppose a 4,000-kg elephant is hoisted 20 m above Earth s surface. What will the elephant s gravitational energy be? (Show your work in the space below.)
5 Activity C: Work and GPE Place the ball, clips, and paper at 0 m. Introduction: Whenever you lift an object to place it on a shelf, you are doing work. Work occurs anytime a force causes an object to move. Question: How much work is done to lift the ball, clips, and paper? 3. Observe: How much gravitational energy do the ball, clips, and paper have now? 4. Calculate: The amount of work (W) done on an object is equal to the force (F) needed to lift the object (the object s weight) multiplied by the distance (d) the object is lifted: W = F d. Use the weight of the ball that you calculated in activity B to determine how much work would be required to lift the ball 2 meters above the zero position: 5. Analyze: Move the ball to the 2-m shelf. A. How much gravitational energy does the ball have now? B. How does the ball s gravitational energy relate to the amount of work needed to place the ball on the 2-m shelf? C. How much work would be needed to lift the ball from the 2-m shelf to the 5-m shelf, and how much gravitational energy would it have on the 5-m shelf? 6. Predict: What do you think would happen to the ball s gravitational energy if it is knocked off the shelf and falls to the floor? 7. Think and discuss: Objects in motion have kinetic energy. As objects fall, their gravitational energy is converted into kinetic energy. How much kinetic energy do you think the ball would have just before it hit the floor if it were dropped from a 2-m shelf? Explain your answer.
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