Download Forces Webquest Focus Questions

Motion and Force Focus Questions
The answers to the following questions will be found in your textbook on pages 380-382 and 384.
1.
Define force.
2.
What are the four fundamental forces in nature?
Force
Description of force
The strongest of all forces. A nuclear force that holds the nucleus of an atom
together. This force causes protons and neutrons to attract to one another. You
do not experience them directly. This force acts over a very short distance.
About ten trillion times weaker than the strong nuclear force, it affects some
kinds of nuclear decay. This force acts over a very short distance.
The weakest force even though it works over longer distances than any of the
other forces. It is the force of attraction that every object in the universe exerts
on every other object in the universe. This force acts over long distances and
pulls objects toward one another. It is an important force in shaping the
structure of our galaxy and the universe. You feel this force everyday.
This force can act over long distances and are about 1% of the strength of the
strong nuclear force. These forces hold electrons near the nucleus of an atom
and hold molecules together. A force that produces friction, magnetism, and
static electricity.
3.
Fill in the blank spaces in the table
Type of Force
Description
Examples
Contact force
Field force
3.
Both contact and field forces can cause an object to ______________________
4.
Define net force.
5.
How does a net force affect the motion of an object?
6.
An object will not accelerate if the net force on it is _______________.
7.
Define balanced forces.
8.
Balanced forces do not cause an object at rest to _______________.
9.
Balanced forces do not cause a change in the motion of a _________________.
10.
Forces are balanced when the net force is ___________.
11.
Give an example of balanced forces when an object is at rest.
12.
Give an example of balanced forces when an object is in motion.
13.
Unbalanced forces do not _________________________________.
14.
Define unbalanced forces.
15.
When forces are unbalanced, the net force acting on the object will cause the object to
_____________________________________________________.
16.
Give an example of an unbalanced force.
17.
If one person pushes an object with 8 N of force to the right, and another person pulls on an
object with 8 N of force to the right, the net force on the object is __________. The force on the
object is said to be _______________.
18.
If one person pushes an object with 8 N of force to the right, and another person pulls on an
object with 8 N of force to the left, the net force on the object is __________. The force on the
object is said to be _______________.
19.
An unbalanced force is necessary to change the motion of an object that is already
____________.
20.
Balanced forces cause _______ change in the motion of an object whether it is
____________________________.
21.
An object moves at a constant speed along a circular path. Is the object experiencing balanced
or unbalanced forces? Explain your answer.
22.
What force always opposes motion?
23.
If there was no friction between a match and the match box surface, would the match light?
Explain your answer.
24.
When is friction necessary?
25.
When is friction unwanted?
The answers to the following questions will be found in your textbook on pages 400-408.
1.
What is Newton’s second law of motion?
2.
When does Newton’s second law of motion apply?
3.
The unbalanced force on an object determines ___________________________
____________________________________________.
4.
Newton’s second law equation:
5.
For equal forces, a larger mass _______________________________.
6.
Force is measured in ________________.
7.
One newton is the force that gives ____________________________________
___________________________________________________.
8.
Acceleration depends on __________________ and ____________________.
9.
Newton’s second law: The acceleration of an object is ____________________ proportional to
the net force on the object and ___________________ proportional to the object’s mass.
10.
This means that if the mass is unchanged, an increase in force means an _________________ in
acceleration. Further, it means that if acceleration is unchanged, an increase in mass means a
_________ in acceleration.
11.
The force on an object due to gravity is called ________________.
12.
Weight is simply the amount of _________________________________ exerted on you by
Earth.
13.
Near Earth’s surface, the free-fall acceleration, ________, is about __________.
14.
Weight equation:
15.
Weight is measured in ___________________.
16.
Weight is different from _____________.
17.
Mass and weight are __________________________ to each other.
18.
Mass definition:
19.
Weight of an object depends on ______________________________________,
________________________________________________________________.
20.
Mass on the moon and Earth are the __________________.
21.
Weight is ___________ on the moon than on Earth.
22.
All objects in the universe attract each other through ______________.
23.
Newton’s law of universal gravitation equation:
24.
This equation states that ________________________________________
______________________________________________________________
_______________________________________________________
25.
Gravitational force between objects is noticeable only when the ____________ are large.
26.
Gravitation force __________________ as mass __________________. This means
_________________________________________________________
_______________________________________________________________.
27.
Gravitational force ________________ as distance _______________. This
means_________________________________________________________
_____________________________________________________________.
28.
Define free fall.
29.
In the absence of air resistance, _____________________________________
______________________________________________________________.
30.
Why do all objects have the same free-fall acceleration?
31.
Define terminal velocity.
32.
Give an example of terminal velocity.
33.
Astronauts in orbit are in _______________.
34.
Can one truly be weightless? Why or why not?
35.
Why do astronauts and their vehicle appear to be weightless?