Newton's First Law of Motion- Inertia (Ch 3)

The astronomer Copernicus publically states in the 1500s that the Earth 

• The ball would not roll up the other plane at all. 
• gravitational acceleration
• revolves around the sun
• is the center of the solar system

Galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane?

• The ball would not roll up the other plane at all.

• nearly the original height.

• to nearly twice the original height.

• to nearly half its original height

Friction is a force that always acts

• in the opposite direction of an object's motion

• gravitational acceleration

• in the same direction as motion

The law of inertia states that on object...

• will continue moving at the same velocity unless na outside force acts on it
• will continue moving in a straight line unless an outside force acts on it
• at rest will stay at rest unless acted on by an outside force
• all of these

After a cannonball is fired into frictionless space, the amount of force needed to keep it going equals

• twice the force with which it was fired
• the same amount of force with which it was fired
• 1/2 the force with which it was fired
• zero, since no force is requires to keep it moving. 

If the force of gravity suddenly stopped acting on the planets they would

• spiral slowly toward the sun
• continue in their orbits for a short time
• move in straight lines tangent to their orbits
• fly straight away from the sun

An object following a straight-line path at a constant speed 

• has zero acceleration
• has no forces acting on it
• has a net force acting in the direction of motion
• none of these

One object has twice as much mass as another object. The first object also has also twice as much...

• velocity
• gracitational acceleration
• inertia
• all of these

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

Compared to its weight on Earth, a 10kg object on the moon is 

• the same
• less
• more

Which has more mass, a kilogram of feathers or a kilogram of iron? 

• feathers 
• iron
• neither