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Transcript
Physics
Newton’s First Law
Name ___________________________________
Period _____
Use the following site to answer the questions below.
http://www.glenbrook.k12.il.us/gbssci/phys/Class/newtlaws/n
ewtltoc.html
HTTP://WWW.GLENBROOK.K12.IL.US/GBSSCI/PHYS/CLASS/NEWTLAWS/N
EWTLTOC.HTML
Lesson One
1.
Newton’s First Law States
An object at rest tends to stay at rest and an object in motion tends to stay
in motion with the same speed and in the same direction _____________
____________________________________________________
2.
____________ = the resistance an object has to a change in its state of motion.
3.
If a ball rolls down a hill without friction how high
will it roll up a second hill? Diagram 2 sets of
hills.
4.
Who is responsible for the idea in 3? ______________
5.
If friction could be eliminated and a ball rolled down
a hill onto a level surface the ball would ___________
_________________________________________________________________
6.
____________________ built on this idea about motion, and said
________________________________________________________
7.
Diagram a book sliding across a table show the direction of book and direction of
friction.
8.
Imagine a place in the cosmos far from all
gravitational and frictional influences. Suppose
that an astronaut in that place throws a rock. The
rock will
a.
gradually stop.
b.
continue in motion in the same direction at constant speed.
9.
An 2-kg object is moving horizontally with a speed of 4 m/s. How much net force
is required to keep the object moving at this speed and in this direction?
_________________
10.
Mac and Tosh are arguing in the cafeteria. Mac says that if he flings the jello with
a greater speed it will have a greater inertia. Tosh argues that inertia does not depend
upon speed, but rather upon mass. Who do you agree with? Explain why?
_________________________________________________________________
11.
If you were in space in a weightless environment, would it require a force to set an
object in motion?
_________________________________________________________________
12.
Mr. Wegley spends most Sunday afternoons at rest on the sofa, watching pro
football games and consuming large quantities of food. What effect (if any) does this
practice have upon his inertia? Explain.
_________________________________________________________________
13.
Ben Tooclose is being chased through the woods by a bull moose which he was
attempting to photograph. The enormous mass of the bull moose is extremely
intimidating. Yet, if Ben makes a zigzag pattern through the woods, he will be able to use
the large mass of the moose to his own advantage. Explain this in terms of inertia and
Newton's first law of motion.
_________________________________________________________________
_________________________________________________________________
14.
Two bricks are resting on edge of the lab table. Shirley Sheshort stands on her
toes and spots the two bricks. She acquires an intense desire to know which of the two
bricks are most massive. Since Shirley is vertically challenged, she is unable to reach
high enough and lift the bricks; she can however reach high enough to give the bricks a
push. Discuss how the process of pushing the bricks will allow Shirley to determine
which of the two bricks is most massive. What difference will Shirley observe and how
can this observation lead to the necessary conclusion?
_________________________________________________________________
_________________________________________________________________
15.
The state of motion of an object is defined by its ____________ - the speed with a
direction.
16.
_____________ = tendency of an object to resist changes in its velocity.
17.
The GBS physics teachers are taking some time off for a
little putt-putt golf. The 15th hole at the Hole-In-One PuttPutt Golf Course has a large metal rim which putters must
use to guide their ball towards the hole. Mr. Schmidgall
guides a golf ball around the metal rim When the ball
leaves the rim, which path (1, 2, or 3) will the golf ball
follow? ____________
18.
A 4.0-kg object is moving across a friction-free surface with a constant velocity of
2 m/s. Which one of the following horizontal forces is necessary to maintain this
state of motion?
a.
0N
b.
0.5 N
c.
2.0 N
d.
8.0 N
e.
depends on speed
19.
Above the diagram shows a book with equal and balanced forces acting on the
book. The book is said to be in ________________________.
20-22. Luke Autbeloe drops a 5.0 kg box of shingles (weight = ~50.0 N) off the
barn house roof into a haystack below. Upon encountering the haystack, the box
of shingles encounters a 50.0 N upward restraining force. Use this description to
answer the following questions. Depress the mouse on the "pop-up menus" to
view the correct answers.
20.
Which one of the velocity-time graphs best describes the motion of the shingles?
Support your answer with sound reasoning.
_____________________________________________________________
_____________________________________________________________
21.
Which one of the following ticker tapes best describes the motion of the falling
shingles from the time that they are dropped to the time that they hit the ground? The
arrows on the diagram represent the point at which the shingles hit the haystack. Support
your answer with sound reasoning.
_____________________________________________________________
_____________________________________________________________
22.
Several of Luke's friends were watching the motion of the falling shingles. Being
"physics types", they began discussing the motion and made the following comments.
Indicate whether each of the comments are correct or incorrect? Support your answers.
a.
Once the shingles hit the haystack, the forces are balanced and the
shingles will stop.
_____________________________________________________________
b.
Upon hitting the haystack, the shingles will accelerate upwards because
the haystack applies an upward force.
_____________________________________________________________
c.
Upon hitting the haystack, the shingles will bounce upwards due to the
upwards force.
_____________________________________________________________
23.
If the forces acting upon an object are balanced, then the object
a. must not be moving.
b. must be moving with a constant velocity.
c. must not be accelerating.
d. none of these
Physics
Newton’s First Law
Name ___________KEY_____________
Period _____
Use the following site to answer the questions below.
http://www.glenbrook.k12.il.us/gbssci/phys/Class/newtlaws/n
ewtltoc.html
Lesson One
1.
Newton’s First Law States
An object at rest tends to stay at rest and an object in motion tends to stay
in motion with the same speed and in the same direction unless acted upon
by an unbalanced force.
2.
Inertia = the resistance an object has to a change in its state of motion.
3.
If a ball rolls down a hill without friction how high
will it roll up a second hill? Diagram 2 sets of
hills.
4.
Who is responsible for the idea in 3? Galileo
5.
If friction could be eliminated and a ball rolled down
a hill onto a level surface the ball would roll almost forever in an
effort to reach the original height.
6.
Isaac Newton built on this idea about motion, and said that a force is not needed
to keep an object in motion.
7.
Diagram a book sliding across a table show the direction of book and direction of
friction.
8.
Imagine a place in the cosmos far from all
gravitational and frictional influences. Suppose
that an astronaut in that place throws a rock. The
rock will
a.
gradually stop.
b.
continue in motion in the same direction at constant speed.
9.
An 2-kg object is moving horizontally with a speed of 4 m/s. How much net force
is required to keep the object moving at this speed and in this direction?
_________________
10.
Mac and Tosh are arguing in the cafeteria. Mac says that if he flings the jello with
a greater speed it will have a greater inertia. Tosh argues that inertia does not depend
upon speed, but rather upon mass. Who do you agree with? Explain why?
_________________________________________________________________
11.
If you were in space in a weightless environment, would it require a force to set an
object in motion?
_________________________________________________________________
12.
Mr. Wegley spends most Sunday afternoons at rest on the sofa, watching pro
football games and consuming large quantities of food. What effect (if any) does this
practice have upon his inertia? Explain.
_________________________________________________________________
13.
Ben Tooclose is being chased through the woods by a bull moose which he was
attempting to photograph. The enormous mass of the bull moose is extremely
intimidating. Yet, if Ben makes a zigzag pattern through the woods, he will be able to use
the large mass of the moose to his own advantage. Explain this in terms of inertia and
Newton's first law of motion.
_________________________________________________________________
_________________________________________________________________
14.
Two bricks are resting on edge of the lab table. Shirley Sheshort stands on her
toes and spots the two bricks. She acquires an intense desire to know which of the two
bricks are most massive. Since Shirley is vertically challenged, she is unable to reach
high enough and lift the bricks; she can however reach high enough to give the bricks a
push. Discuss how the process of pushing the bricks will allow Shirley to determine
which of the two bricks is most massive. What difference will Shirley observe and how
can this observation lead to the necessary conclusion?
_________________________________________________________________
_________________________________________________________________
15.
The state of motion of an object is defined by its velocity - the speed with a
direction.
16.
Inertia = tendency of an object to resist changes in its velocity.
17.
The GBS physics teachers are taking some time off for a
little putt-putt golf. The 15th hole at the Hole-In-One PuttPutt Golf Course has a large metal rim which putters must
use to guide their ball towards the hole. Mr. Schmidgall
guides a golf ball around the metal rim When the ball
leaves the rim, which path (1, 2, or 3) will the golf ball
follow? ____________
18.
A 4.0-kg object is moving across a friction-free surface with a constant velocity of
2 m/s. Which one of the following horizontal forces is necessary to maintain this
state of motion?
a.
0N
b.
0.5 N
c.
2.0 N
d.
8.0 N
e.
depends on speed
19.
Above the diagram shows a book with equal and balanced forces acting on the
book. The book is said to be in equilibrium.
20.
Luke Autbeloe drops a 5.0 kg box of shingles (weight = ~50.0 N) off the
barn house roof into a haystack below. Upon encountering the haystack, the box
of shingles encounters a 50.0 N upward restraining force. Use this description to
answer the following questions. Depress the mouse on the "pop-up menus" to
view the correct answers.
20.
Which one of the velocity-time graphs best describes the motion of the shingles?
Support your answer with sound reasoning.
_____________________________________________________________
_____________________________________________________________
21.
Which one of the following ticker tapes best describes the motion of the falling
shingles from the time that they are dropped to the time that they hit the ground? The
arrows on the diagram represent the point at which the shingles hit the haystack. Support
your answer with sound reasoning.
_____________________________________________________________
_____________________________________________________________
22.
Several of Luke's friends were watching the motion of the falling shingles. Being
"physics types", they began discussing the motion and made the following comments.
Indicate whether each of the comments are correct or incorrect? Support your answers.
a.
Once the shingles hit the haystack, the forces are balanced and the
shingles will stop.
_____________________________________________________________
b.
Upon hitting the haystack, the shingles will accelerate upwards because
the haystack applies an upward force.
_____________________________________________________________
c.
Upon hitting the haystack, the shingles will bounce upwards due to the
upwards force.
_____________________________________________________________
23.
If the forces acting upon an object are balanced, then the object
a. must not be moving.
b. must be moving with a constant velocity.
c. must not be accelerating.
d. none of these