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Physical Science: Chapter 5 Practice Test

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1.
2 points
If no external forces acting on a system are equal in magnitude but opposite in direction there is no net force acting on it because the forces are balanced.
2.
2 points
Newton's third law applies to all objects regardless of their condition of motion.
3.
2 points
The results of an unbalanced force on a system is a change in _________.
4.
2 points
Which of the following is an aspect of dynamics?
5.
2 points
Which of the following are the result of a field force?
6.
2 points
Who discovered that matter naturally resist a change in motion, also known as a inertia?
7.
2 points
Why are hot air balloons floating at a constant attitude not considered to be in free fall?
8.
2 points
If one of the external forces acting on a system is greater in magnitude and still opposite in direction the forces are unbalanced and there will be a net force acting in the direction of the ___________ force.
9.
2 points
Physicists refer to pushes or pulls on systems as ________.
10.
2 points
Galileo tested Aristotle's theory of gravity by actual experiments dealing with balls on wooden _______.
11.
2 points
Which of the following field forces surrounds anything made of matter and affects everything?
12.
2 points
Newton's first law describes an object's motion when no net forces are exerted on it.
13.
2 points
Both compression and tension forces act in ______________ directions on a system.
14.
2 points
The gravitational force between two objects depends on their ________ and the distance between them.
15.
2 points
Contact forces cause all observed changes in motion.
16.
2 points
Which of the following situations involves friction?
17.
2 points
According to the action reaction principle, a force in one direction will always produce a corresponding motion in the opposite direction.
18.
2 points
There are four fundamental forces and gravity is the weakest of them all.
19.
2 points
If you drop a pebble down a well 10 meters deep, it will reach the bottom and half the time that it would take to reach the bottom of a well 20 meters deep.
20.
2 points
Which of the following are not directly proportional?
21.
2 points
Which of the following are included in the main field forces?
22.
2 points
A rotating bicycle tire experiences _______ friction.
23.
2 points
An object weight is directly proportional to
24.
2 points
You can tell when the forces acting on a system are balanced when there is no ______________.
25.
2 points
The SI unit of force is the
26.
2 points
Field forces grow stronger with distance from the source, but contact forces do not change with distance.
27.
2 points
Scientists and engineers properly call contacts forces
28.
2 points
Object experiencing free fall do not fall at a constant speed.
29.
2 points
All that is necessary to cause a change in motion of a system is to have a balanced force acting on that system.
30.
2 points
______________ forces cause an object, if it is in motion, to maintain its motion.
31.
2 points
Susceptible objects are those that
32.
2 points
Which of the following are types of friction?
33.
2 points
Every object in the universe has more than _____ force acting on it, but not everything is in continual motion.
34.
2 points
Forces are __________ because they cause objects to be pushed or puled in a single direction and with a certain magnitude.
35.
2 points
Air resistance is a form of __________.
36.
2 points
Modern physics studies the effects of extreme friction and the unusual behavior of things that are extremely fast or extremely small.
37.
2 points
Friction acts only on objects in motion.
38.
2 points
Everything in the universe is susceptible to gravity.
39.
2 points
Newton's third law of motion explains how your chair is supporting your weight as you sit at your computer right now.
40.
2 points
Who took Galileo's discovery of matter naturally resisting a change in motion and called it inertia?
41.
2 points
A microscopic organism like a protozoan can exert a gravitational force.
42.
2 points
Objects that are falling under the influence of gravity alone are experiencing ___________.
43.
2 points
Newton's first law describes an object's motion when no net forces are exerted on it.
44.
2 points
Who was the first person to write about the causes of motion?
45.
2 points
An object must be _______________ another in order to exert a contact force on it.
46.
2 points
A force in one direction will always produce a force in the opposite direction but motion may not always occur.
47.
2 points
Forces that act between objects that are not touching are called ________ forces.
48.
2 points
If the mass of a system is constant its acceleration will change when the force exerted on it changes.
49.
2 points
Which of the following is the result of a contact force?
50.
2 points
An astronaut floating in orbit around the Earth has weight.
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