Conceptual Physics Chapter 4 Newton's First Law of Motion
Terms in this set (15)
The amount of matter in an object is called its weight
The SI unit of force is called the kilogram
If a hockey puck slides on a perfectly frictionless surface, it will eventually slow down because of its inertia
Inertia is the reluctance any material object has to change in its state of motion
The combination of all the forces that act on an object is called the net force
The astronomer Copernicus was the first person to publicly state that the earth
revolves around the sun
Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to
follow a straight line path
Galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane?
to nearly the same height as where it originally started
The law of inertia states that an object
at rest will remain at rest unless acted on by an outside force, will continue moving at the same velocity unless an outside force acts on it,will continue moving in a straight line unless an outside force acts on it (all of the above)
The law of inertia applies to
both moving and nonmoving objects
After a cannon ball is fired into frictionless space, the amount of force needed to keep it going equals
zero, since no force is necessary to keep it moving
Which has more mass, a kilogram of feathers or a kilogram of iron?
Neither. The masses are equal
A 10 N force and a 30 N force act on an object in opposite directions. What is the net force on the object?
How much does a 2 kg bag of nails weigh?
Suspend a heavy weight by two pieces of rope. Tensions in the ropes is greatest when the ropes
the widest angle