Unit 3 - Causes of Motion Activity 4 - Force, Mass and Acceleration
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1 Unit 3 - Causes of Motion Activity 4 - Force, Mass and Acceleration Background: The simulation forces-1d allows you to explore the relationship between force, mass and acceleration. The simulation allows you to select different objects (each with a different mass) to which a horizontal force can be applied (by a fellow named Joe). Different aspects of the objects motion can then be measured. Part 1: Explore the Sim A screenshot of the simulation is shown below. Spend 5 minutes exploring the sim. Find out the following and record your answers below: How do you select an object? How do you change the mass of the object? How do you apply a push? How do you change the force of the push? How do you determine the total (net) force being applied to the object? Can you turn the free body diagram on? How can you find out about the motion of the object? Modeling Instruction AMTA U3 Causes of Motion Activity 4 NC v.1
2 Can you quantify the acceleration of the object? Can you turn friction off? How do you reset the sim? What other settings can you change? Are you able to record your experiments so you can review what happened? Part 2: Explore the effect of force on acceleration (with no friction) Now you have had a chance to explore the sim, let s see if you can figure out the relationship between the total force applied and the motion of an object. Prediction: What effect will increasing the force have on the motion of an object? You will complete 5 trials. Start by turning friction off. Select an object for Joe to push. Record the mass of the object. Have Joe push the same object with different magnitudes of force, record the acceleration of the object for each force. Calculate the quotient of force and mass (force mass) Table 1: Part 2 Results Mass of object (kg) Total force (N) Acceleration (m/s 2 ) Keep this constant F m Modeling Instruction AMTA U3 Causes of Motion Activity 4 NC v.1
3 What did you notice about the magnitude of acceleration and the quotient of force and mass? Write a rule to describe the relationship between force and acceleration. Part 3: Explore the effect of mass change on acceleration (with no friction) Now you have had a chance to explore the sim, let s see if you can figure out the relationship between the mass and the motion of an object. Prediction: What effect will increasing the mass have on the motion of an object? You will complete 5 trials. Start by turning friction off. Select an object for Joe to push. Record the mass of the object. With each trial change the mass of the object. Have Joe push object with the same amount of force, record the acceleration of each of the object. Calculate the quotient of force and mass (force mass) Modeling Instruction AMTA U3 Causes of Motion Activity 4 NC v.1
4 Table 2: Part 3 Results Mass of object (kg) Total force (N) Keep this constant Acceleration (m/s 2 ) F m What did you notice about the magnitude of acceleration and the quotient of force and mass? Write a rule to describe the relationship between mass and acceleration. Part 4: Using what you have learned Modeling Instruction AMTA U3 Causes of Motion Activity 4 NC v.1
5 Now let s see if you can apply what you have learned. Some of the cells in the table below have been left blank. Predict what the answer should be, then use the simulation to find out if you were correct. Total Force (N) Mass (kg) Acceleration (m/s 2 ) ? Predicted answer Simulation answer ?? 50 10? ? ? 20? ? And finally... What do you now understand about the relationship between Force, Mass and Acceleration? Extension: Explore the effect of force on acceleration (with friction) Repeat the experiment from part 2, but this time have friction turned on. Will you be able to use the rule you developed in part 2? Why or why not? Modeling Instruction AMTA U3 Causes of Motion Activity 4 NC v.1
6 How will adding friction effect your results? Table 3: Extension Results Mass of object (kg) Total force (N) Acceleration (m/s 2 ) Keep this constant F m How did your results from part 2 compare to your results from this extension? Explain the relationship between the force applied to an object, the mass of an object and the acceleration of the object. This activity is a modification of a lesson submitted to phet by Patricia Martinez of Greeley Central High School Modeling Instruction AMTA U3 Causes of Motion Activity 4 NC v.1
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