science ch6
Terms
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copy deck
- Free fall
- When gravity is pulling an object down and no other forces are acting on it
- Give three examples of objects in projectile motion.
- Leaping frogs, balls, and arrows
- Give three examples of objects that orbit.
- Spaceships, satalites, and moons
- How does gravity affect the acceleration of falling objects in space?
- It pulls it towards the nearest orbit.
- How does gravity affect the acceleration of falling objects on Earth?
- Gravity matches air resistance and the object falls at a terminal velocity. Gravity pulls the objects towards the earths center.
- How gravity affect the acceleration of falling objects on the moon?
- It pulls it toward the moons center but slowly because there is no air resistance
- How is intertia related to mass and how is momentum related to mass?
- Mass is a measure of inertia and momentum depends on mass
- Inertia
- The tendancy of all objects to resist changes in motion
- Momentum
- A property of a moving object depending on its mass and velocity
- Projectile Motion
- The curved path an object follows when thrown or propelled near the earth's surface
- Terminal velocity
- When air resistance matches the force of gravity and the object falls at a constant velocity
- What is 9.8 m/s/s?
- The rate at which objects accelerate towards Earth
- What is Newton's first law?
- An object at rest remains at rest and an object in motion remains at a constant speed and in a straight line unless acted on by an unbalanced force.
- What is Newton's second law?
- The acceleration of an object depends on the mass of the object and the amount of force applied.
- What is Newton's third law?
- Whenever one object exherts a force on a second object, the second object exherts an equal and opposite force on the first.
- What is the difference between projectile motion and orbit?
- Projectile motion is close to the Earth's surface
- Who was Newton and what was he famous for?
- He was an Italian scientist famous for his laws of motion.
- Why do objects in orbit seem to be weightless?
- They are in freefall?