If you are having trouble getting consistent results, send the marble around the track at a higher speed.ġ7 Make a barrier around your table with books and rulersĭon’t tell me you lost your marble. The path of the lower mass glass marble is more likely to be affected by forces applied to it after it leaves the track. Take your time with your observations.ġ6 Possible Pitfalls Irregularities on the table and any spin on the marble may cause the marbles to veer from its intended path. We will be making observations that do not include recording numbers or measuring distances or times. It is a word that describes the tendency of an object to keep moving on its current path and at its current speed. An object traveling in a straight line at a constant speed is moving (changing position), but in not changing its motion (not accelerating) because neither its speed nor its direction is changing.ġ1 Inertia Which type of car, a heavier or lighter one, needs more force to slow down with the same deceleration? A car with more mass needs more force to slow it down.īackground information: Inertia IS NOT a force. What is a change in motion? A moving object does not necessarily have a change in motion. In other words, with the same applied force, an object with a smaller mass will have greater acceleration.Īctivity 79 Title: Inertia Around a Curveĩ Read E-25 Problem: How does inertia affect how an object moves? When an object is subject to a force, there is an inverse relationship between its mass and its resulting acceleration. There is a direct relationship between the force applied to an object and its resulting acceleration. Since force, measured in newtons, is equal to mass times acceleration, the unit of force, must be equal to the unit of mass (kg) times the unit of acceleration (m/s2), which is known as the compound unit of kg- m/s2. Use your equation to explain why this makes sense. One newton of force is the same as 1 kg x 1 m/s2. Thus, for an object to obtain a higher acceleration with less force, it must have less mass.Ħ One newton of force is the same as 1 kg x 1 m/s2 Newton’s equation F = ma, can be rewritten as a = F/m, which shows that acceleration is the ratio of force to mass. Vehicle 2 can have a greater acceleration with less force if it has a lower mass than Vehicle 1. How can this be? Explain in terms of your equation.
Experiment 3 Force (N) Mass of Block (kg) Acceleration of Block (m/s2) 25 5 20 2 10 50 100 4 1,000 40ĥ In the first activity, Vehicle 2 has greater acceleration than Vehicle 1, but has a less forceful engine. Use your equation for force, mass, and acceleration to find the missing values in the table below. The slope on “Experiment 2” is steeper than the slope from “Experiment 1” because the mass is 4 kg in “Experiment 2” and the mass is 2 kg in “Experiment 1”. In this situation, force versus acceleration will always be a straight-line graph that goes through the origin and have a slope equal to the mass.ģ any differences The major differences in the graphs is that the second plot has a steeper slope.
This is a result of graphing the relationship F = ma when the mass is held constant. The similarities are that both plots show a direct relationship between force and acceleration, both have straight lines that go through the origin, and both have a positive slope. In this case the graph shows that the relationship between force and acceleration is linear because the best fit for the data set is a straight line.Ģ Compare the two lines, “Experiment 1” and “Experiment 2” on your graphĬompare the two lines, “Experiment 1” and “Experiment 2” on your graph. It does indicate a relationship because in both experiments, as the force increases, so does acceleration. 1 Activity 78 Analysis Look at your graphed line for “Experiment 1.” Explain why it does or does not indicate that there is a relationship between force and acceleration.
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