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Physics Chp 10 Sec 3
Mr. Radeke pages 349-352
Question | Answer |
---|---|
inertia | Inertia is the tendency of an object to resist a change in motion. |
How is mass related to motion? | Mass is directly related to inertia. Greater mass causes greater inertia. |
What are two ways to increase force? | increase force or decrease mass |
What does Newton's first law of motion state? | Unless acted upon by an unbalanced force, an object at rest will stay at rest and an object in motion will continue moving at a constant velocity. |
Why is Newton's first law of motion sometimes called the law of inertia? | Inertia is a measure of an object's tendency to resist a change in motion, a statement that has the same meaning as Newton's first law of motion. |
Use what you know about inertia to explain why you feel pressed back into the seat of a car when it accelerates. | Because of your inertia, your body has a tendency to remain in place. The moving car causes you to accelerate by exerting force on your back. |
State Newton's second law of motion in your own words. | Greater force increases acceleration, greater mass decrease acceleration; Force/Mass |
How could you keep an object's acceleration the same if the force acting on the object doubled? | by doubling the objects mass |
Using what you know about Newton's second law, explain why a car with a large mass might use more fuel than a car with a smaller mass. Assume both cars drive the same distance. | A greater force is required to accelerate a more massive car, therefore, more engine power is required and more fuel is needed to produce that power. |