Astronomy 101 08-12

Ion rocket engine produces 1 Newton of thrust, what acceleration can it give to a space probe with a mass of 1000kg?

0.001 m/s2 A=F/m 1/1000=0.001

You lift an object by exerting up ward 12 Newton, gravity exerts 10 newton, what is the force on object

2 newton

Newton's explanation of Kepler's Laws relied upon a force that?

Acts on all objects

Kepler's Law

Are explained by a force that attracts each planet to the sun

Who discovered Newton's first law of motion?

Galileo

Freely falling objects with different masses fall with the same acceleration because?

Gravity exerts more force on then more massive object.

Magnitude of the acceleration was?

Inversely proportional to the the square of the distance from the sun.

The gravitational attraction of the earth for other objects, such as moon, apples and space shuttles

Is smaller for objects farther from the earth but never vanishes entirely

Galileo said that a moving object with nothing pushing or pulling on it will always?

Keep moving at the same speed

Law of inertia states that a moving object will?

Keep moving if no force acts on it

Unit of mass is the?

Kilogram

Unit of force is the

Newton

When an arrow is fired from a bow, the arrow keeps moving after it leaves the bow because?

No force stops it

Aristotle said mundane object with nothing pushing or pulling on it will aways?

Slow down and stop

Compared to the object on earth, the moon's acceleration is?

Smaller

Aristotle said that the amount of force on a moving earthly object determines its?

Speed

According to Galileo, thrown spear keeps moving after it has left the spear thrower's hand because?

The force of friction with the air is not enough to stop the spear

A horse is pulling a cart along a road. What's the action reaction pair?

The force of horse on the road and the force of the road on horse

According to Aristotle, a thrown spear keeps moving after it has left the hand because?

The force of the air disturbed by the spear keeps it in motion

Aristotle said 2 objects drops from the same height, and without air resistance the heavier object will?

The heavier object would hit the ground long before the lighter one

Newton's theory of gravity, everything was attracted to?

To every other object in the universe

Direction of the acceleration for a planet that was following Kepler's law, that the direction of the acceleration was?

Toward the sun

Direction of the acceleration of earth' moon?

Towards earth?