Exam 4: Why Things Move As They Do

Mary pushes horizontally on a large, heavy table, which is standing alone in the middle of a room, and notes that the table does not move despite the fact that she is pushing on it (see the figure). Why doesn't the table move?

Regarding the relation between acceleration, force, and mass, an object's acceleration is

Jet planes operate by

You push your 2 kg physics book along a tabletop, pushing it with 10 newtons of force. The frictional force on it is 4 newtons. The book's acceleration is

Suppose that we wish to find the "net force" on an automobile, in order to apply Newton's law of motion to the motion of the automobile. As part of the net force, do we need to include "internal frictional forces" due to internal gears, bearings, etc.?

When you pull an object, such as a table, across the floor, the forward force by you on the table is equal but opposite to the backward force by the table on you. It seems as though these two forces should balance out, so that the table can't be moved. But the table does move, because

An apple weighing 3 newtons hangs, motionless, from a tree branch. What are the forces by the environment that act on this apple?

A "force" could be best described as

The "drive force" that pushes a car forward is

You hold a 2 newton apple, having a mass of 0.2 kg, at rest in your hand. The net force on the apple is then

A 39- kg girl standing at rest on slippery (frictionless) ice catches a 1- g ball moving at 10 m/s. Just afterward, the girl is

You would be richest if your hunk of gold weighed 10 newtons

A car weighing 5000 N is traveling along a straight level road powered by a forward drive force of 500 N. The force of air resistance is 200 N, and rolling resistance is 100 N. The car's acceleration is

Marcia places a lead block and an iron block on the table, and hits both of them with the same force. The lead block is twice as massive as the iron block. The acceleration of the lead block is

One newton is about equal to

An apple weighing 3 newtons hangs, motionless, from a tree branch. The net force on the apple is

An auto weighing 3000 newtons has a forward drive force of 1000 newtons. Air resistance on the car is 100 newtons, and road resistance is 100 newtons. The auto moves along a straight level road. The force due to gravity acting on the auto is

Which of the following is the basic [and most accurate] meaning of "mass"? An object's "mass" is

The law of inertia says that

An object's "momentum" is defined as