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Ty Phy Sci Chpt 6
Forces in Motion
| Question | Answer |
|---|---|
| the constant velocity of a falling object when the size of the upward force of air resistance matches the size of the downward force of gravity | terminal velocity |
| the condition an object is in when gravity is the only force acting on it | free fall |
| the curved path an object follows when thrown or propelled near the surface of the earth | projectile motion |
| How does air resistance affect the acceleration of falling objects? | it slows or stops them |
| Explain why an astronaut in an orbiting spaceship floats. | Both the astronaut and the spaceship are in free fall. Since they are both falling at the same rate, he floats. |
| How is an orbit formed? | combining a forward motion with a free fall toward earth results in a curve that matches the curve of the earth's surface |
| the tendency of all objects to resist any change in motion | inertia |
| a property of a moving object that depends on the object's mass and velocity | momentum |
| an object at rest remains at rest and an object in motion remains in motion at a constant speed and in a straight line unless acted on by an unbalanced force | Newton's first law of motion |
| the acceleration of an object depends on the mass of an object and the amount of force applied | Newton's 2nd law of motion |
| whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first | Newton's 3rd law of motion |
| Name 2 ways to increase the acceration of an object. | increase the force, reduce the object's mass |
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beth2244
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