Physics Test #1

The number of forces that act on a bag of sugar suspended by a weighing scale are

2

A pair of parallel forces 8N and 12N can have a resultant of

4 or 20

T/F A scalar quantity has both magnitude and direction, whereas a vector quantity is described by only its direction

False

T/F A scientific fact is something that is absolute and unchanging

False

Nellie Newton can hang from the middle of 2 ends of a rope in such a way that the tension in the rope can greatly exceed her weight

True

A theory is

a synthesis of a large collection of information including well-tested guesses

A hypothesis is

an educated guess that has yet to be proven by experiment

A scientific fact is

close agreement between competent observers of observations of the same phenomena.

Suzie holds an apple at rest in her outstretch hand. The force she applies in holding it still

equals the weight of the apple

When Nellie Newton hangs by a pair of vertical ropes, the tension in each rope will be

half her weight

When you stand on 2 bathroom scales, one foot on each scale with weight distributed equally, each scale will read

half your weight

The equilibrium rule, EF = 0, applies to

objects or systems at rest, and objects or systems in uniform motion in a straight line

The equilibrium rule EF = 0, applies to

vector quantities

Physics is the most basic science because

you can better understand science in general if you understand physics, the ideas of physics extend into more complex sciences, underneath biology is chemistry and underneath chemistry is physics

T/F An object can be in equilibrium whether it is at rest or moving steadily at a constant speed in a straight line

True (bc STRAIGHT LINE)

Which problem would not be a part of physics

identifying all of the bones in the human body

The difference between a hypothesis and a theory is that a hypothesis

is a guess that has not been well-tested whereas a theory is a synthesis of well-tested and verified guesses

Which is a scientific hypothesis

Atoms are the smallest particle of matter that exist

What is the scientific method

1. recognize problem 2. make hypothesis 3. predict what will happen 4. design/conduct experiment 5. record data 6. share results 7. revise experiment

An airplane in an acrobatic loop the loop is in dynamic equilibrium if the speed is constant

False (has to be in a straight line)

What is not part of the scientific method

Repeat the experiments until the answers match the predictions

Which is not true

Science and technology exclude the human factor (Only science excludes the human factor)

T/F A hypothesis is scientific if there exists a test for proving it wrong

True

T/F The net force on an object is the combination of all of the forces that act on it

True

T/F The synthesis of a large collection of information that encompasses well-tested and verified hypotheses about certain aspects of the natural world is known as a scientific theory

True

T/F When scientific findings are expressed mathematically, they are easier to verify or disprove by experiment

True

T/F: In science, an educated guess about the answer to a scientific question is called a hypothesis

True

To test a scientific hypothesis you would

set up many experiments and look at the results

When you press a coiled spring downward, the spring presses upward on your hand with

the same amount of force