Transcript Newton`s Laws and Forces

Newton’s Laws
Forces and Motion
A force that is applied by gravity to an object
A.
B.
C.
D.
E.
F.
Normal Force
Weight
Natural Force
Friction
Tension
None of These
[Default]
[MC Any]
[MC All]
Any force applied to an object by a surface
A.
B.
C.
D.
E.
Tension
Weight
Normal force
Balanced force
None of These
[Default]
[MC Any]
[MC All]
A force that is applied to an object
through a string, rope, or chain is called…
A.
B.
C.
D.
E.
F.
Friction
Natural Force
Normal Force
Net Force
Tension
None of these
[Default]
[MC Any]
[MC All]
A force that resists the motion of an
object is called…
A.
B.
C.
D.
E.
F.
Natural force
Friction
Weight
Normal Force
Applied Force
None of these
[Default]
[MC Any]
[MC All]
Which direction does weight act?
A.
B.
C.
D.
E.
F.
G.
To the right
To the left
North
South
Up
Down
At some angle to the horizontal
[Default]
[MC Any]
[MC All]
What direction does the friction force act?
A. Perpendicular to the surface in the same
direction as the motion.
B. Parallel to the surface in the same direction
as the motion.
C. Perpendicular to the surface in the opposite
direction of the motion.
D. Parallel to the surface in the opposite
direction of the motion.
E. At some angle to the surface not related to
the motion.
What direction does the Normal force act?
A. Perpendicular to the surface pointing toward
the surface.
B. Perpendicular to the surface pointing away
from the surface.
C. Parallel to the surface pointing in the direction
of motion.
D. Parallel to the surface pointing opposite the
direction of motion.
E. At some angle to the surface unrelated to the
motion.
Net force can be calculated which of the
following ways. (Choose all that apply.)
A. Adding all of the force magnitudes
together
B. Adding all of the force vectors together
C. Multiplying mass times acceleration
D. Multiplying mass times velocity
E. Dividing mass by acceleration
F. Dividing mass by velocity
Friction depends on what factors?
Choose all that apply.
A.
B.
C.
D.
E.
F.
Weight
Normal force
Applied force
Surface textures
Surface Area
None of these
Newton’s 1st Law is best summarized as…
A.
B.
C.
D.
E.
Action-Reaction
Unbalanced Forces
Inertia
Gravity
None of these
Newton’s 3rd Law can be best
summarized as …
A.
B.
C.
D.
E.
Action-Reaction
Unbalanced Forces
Inertia
Gravity
None of these
What quantity ties forces acting on an object
and the motion of the object together?
A.
B.
C.
D.
E.
Velocity
Net force
Normal force
Mass
Acceleration
What happens to the acceleration of a given
object if the Net Force acting on it is doubled?
A.
B.
C.
D.
E.
Stays the same
Double the original
Quadruple the original
Becomes half of the original
Becomes one-quarter of the original
What happens to the acceleration if the Force
remains constant and the mass is doubled?
A.
B.
C.
D.
E.
Stays the same
Double the original
Quadruple the original
Becomes half of the original
Becomes one-quarter of the original
If Action-Reaction force pairs are equal
and opposite, are they balanced forces?
A. Yes, they cancel each other out
B. No, because they are acting on different
objects
C. The answer depends on the specific
problem
An object has a mass of 65 grams on Earth. How
much mass does it have on the moon? (g=1.6 m/s2)
A.
B.
C.
D.
E.
F.
G.
0.104 g
0.638 g
6.63 g
40.6 g
65 g
104 g
638 g
An object has a mass of 65 grams on
Earth. How much does it weigh?
A.
B.
C.
D.
E.
F.
G.
0.104 N
0.638 N
6.63 N
40.6 N
65 N
104 N
638 N
An object has a mass of 65 grams on Earth. How
much does it weigh on the moon? (g=1.6 m/s2)
A.
B.
C.
D.
E.
F.
G.
0.104 N
0.638 N
6.63 N
40.6 N
65 N
104 N
638 N
Which statements below are true if an object is
said to be in “equilibrium”? (Choose all that apply)
A. All of the horizontal forces are balanced
B. All of the vertical forces are balanced
C. Horizontal forces are balanced, but
vertical forces are not balanced
D. Vertical forces are balanced, but
horizontal forces are not balanced
E. Net Force is zero
F. None of these are true statements
A 6 kg bowling ball is given an acceleration of
2 m/s2. How much force was required?
A.
B.
C.
D.
E.
F.
2N
3N
6N
9.81 N
12 N
None of these
A large dog weighs 400 N. What is
the mass of the dog?
A.
B.
C.
D.
E.
9.81 kg
40.77 kg
400 kg
3924 kg
None of these
What is the Net Force on a 20N stone if
you apply an upward force of 27 N on it?
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
0N
7 N, up
7 N, down
20 N, up
20 N, down
27 N, up
27 N, down
47 N, up
47 N, down
None of these
What is the acceleration on a 20N stone if
you apply an upward force of 27 N on it?
A.
B.
C.
D.
E.
F.
0 m/s2
2.04 m/s2
2.54 m/s2
2.75 m/s2
3.43 m/s2
None of these
A race car with a mass of 1000 kg starts from rest
and travels 60 m in 4 second. What Net Force is
applied to the car?
A.
B.
C.
D.
E.
0N
7.5 N
133 N
7500 N
None of these
A 15 kg crate is pushed across a level floor by an
applied force of 100 N. If the coefficient of friction
between the crate and the floor is 0.35, what is the
normal force acting on the crate?
A.
B.
C.
D.
E.
F.
0N
1.5 N
35 N
51.5 N
147 N
None of these
[Default]
[MC Any]
[MC All]
Hint: Draw the force diagram!
15 kg
A 15 kg crate is pushed across a level floor by an
applied force of 100 N. If the coefficient of friction
between the crate and the floor is 0.35, what is the
force of friction acting on the crate?
A.
B.
C.
D.
E.
F.
0N
15 N
35 N
51.5 N
147 N
None of these
Hint: Draw the force diagram!
15 kg
A 15 kg crate is pushed across a level floor by an
applied force of 100 N. If the coefficient of
friction between the crate and the floor is 0.35,
what is the vertical net force acting on the crate?
A.
B.
C.
D.
E.
0N
35 N
48.5 N
51.5 N
147 N
Hint: Draw the force diagram!
15 kg
A 15 kg crate is pushed across a level floor by an
applied force of 100 N. If the coefficient of friction
between the crate and the floor is 0.35, what is the
horizontal net force acting on the crate?
A.
B.
C.
D.
E.
0N
35 N
48.5 N
51.5 N
147 N
Hint: Draw the force diagram!
15 kg
A 15 kg crate is pushed across a level floor by an
applied force of 100 N. If the coefficient of friction
between the crate and the floor is 0.35, what is the
acceleration on the crate?
A.
B.
C.
D.
E.
0 m/s2
0.33 m/s2
3.23 m/s2
3.43 m/s2
9.81 m/s2
Hint: Draw the force diagram!
15 kg