physics quiz 1

The force of friction on a sliding object is 20 N. The applied force needed to maintain constant velocity is

20 N

a man weighing 950 Newton stands at rest on to bathroom scales that his weight is distributed evenly over both scales so that his weight is distributed evenly over both scales. The reading on each scale is

475 N

An object in mechanical equilibrium is an object a. at rest. b. moving with constant velocity. c. having no acceleration. d. all of these.

all

Science, art, and religion do not contradict one another because

all three have different domains

If no external forces are acting on a moving object, it will

continue moving at the same velocity

Science is a body of knowledge that

describes order in nature is an ongoing activity of humans condenses knowledge into testable laws

A sailboat is moving at constant velocity, probably under motor. Inside the storage compartment, a wine bottle is dropped from the midpoint of the ceiling and strikes the floor below. The bottle hits the floor

exactly below the midpoint of the ceiling

Whirl a rock at the end of a string. If the string breaks, the tendency of the rock is to

follow a straight line path

The scientific method is most effective in

gaining, organizing, and applying new knowledge

If your automobile runs out of fuel while you are driving, the engine stops but you coast down to a gradual stop. The concept that most explains why is

inertia

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that

inertia tends to resist movement of the milk carton

Whereas Aristotle relied on logic in explaining nature, Galileo relied on

testing ideas by experiment

Which of the following is a scientific hypothesis?

the moon is made of unidentified elements

A scientific hypothesis may turn out to be right or it may turn out to be wrong. If it is a valid hypothesis, there must be a test for proving it

wrong