### Forces Review - Turning Point

```Forces Review
Which of the following is the cause of an
acceleration or a change in an object’s motion?
speed
inertia
force
velocity
0%
ve
lo
cit
y
e
0%
fo
rc
a
0%
in
er
ti
0%
sp
ee
d
1.
2.
3.
4.
Which of the following forces is an
example of a field force?
gravitational force
frictional force
normal force
tension
m
n
0%
te
ns
io
al
fo
rc
e
0%
no
r
fri
ct
io
na
lf
or
fo
rc
e
na
l
tio
vit
a
0%
ce
0%
gr
a
1.
2.
3.
4.
A cart is pushed with an acceleration
of 2 m/s2. If µ = 0.5, what does the net
force equal?
FA
FFr
FA – FN
FA – FFr
0
–F
0%
0
FN
–
FA
0%
Fr
0%
FA
0%
FF
r
0%
FA
1.
2.
3.
4.
5.
An army ranger is lifted by a cable to a
helicopter at a constant velocity?
FT
Fg
FT – Fg
Fg – FT
0
–F
Fg
FT
0%
0
0%
T
0%
–F
g
0%
Fg
0%
FT
1.
2.
3.
4.
5.
A bike is coasting to a stop. What is
the net force equal to?
Gravitational Force
Zero
Frictional Force
Normal Force
0%
0%
ce
al
Fo
r
m
No
r
lF
or
c
e
Ze
ro
0%
Fr
ict
io
na
ta
t
io
na
lF
or
c
e
0%
Gr
av
i
1.
2.
3.
4.
Which of the following is the tendency of
an object to maintain its state of motion?
acceleration
inertia
force
velocity
0%
ve
lo
cit
y
e
0%
fo
rc
a
0%
in
er
ti
tio
n
0%
ac
ce
le
ra
1.
2.
3.
4.
An object with a mass of 100kg has
what weight in Newtons?
25%
25%
50
0
25%
0
25%
98
0
9.8
980
0
500
9.
8
1.
2.
3.
4.
With a constant applied force, mass is
directly proportional to acceleration.
This statement describes which of
Newton’s Laws?
0%
0%
b.
..
ea
th
of
No
ne
0%
3r
d
0%
2n
d
1st
2nd
3rd
None of the above
1s
t
1.
2.
3.
4.
If a nonzero net force is acting on an
object, then the object is definitely
1. at rest.
2. moving with a
constant velocity.
3. being accelerated.
4. losing mass.
as
s.
0%
lo
s in
gm
te
d.
0%
cc
el
er
a
ga
be
in
a
co
n
sta
n
at
wi
th
ng
ov
i
m
0%
t.
..
re
st
.
0%
Which are simultaneously equal but opposite
forces resulting from the interaction of two
objects?
1. net external forces
2. field forces
3. gravitational forces
4. action-reaction pairs
pa
io
n
re
ac
t
ac
t io
n-
tio
vit
a
0%
irs
fo
rc
es
0%
na
l
fie
ld
fo
rc
es
0%
gr
a
ne
te
xt
er
na
lf
or
ce
s
0%
What is not true regarding action
reaction forces?
on
ct
Th
ey
a
tru
e.
0%
ar
e
Al
l
sa
m
th
e
on
ct
Th
ey
a
0%
di
f fe
re
nt
e
t io
n
ica
ap
pl
an
re
Th
ey
a
0%
ob
...
..
0%
ob
. ..
1. They are an application of
Newton’s 3rd Law.
2. They act on the same
object.
3. They act on different
objects.
4. All are true.
The magnitude of the force of
gravity acting on an object is
frictional force.
weight.
inertia.
mass.
as
s.
0%
m
a.
0%
in
er
ti
ei
gh
t.
0%
w
io
na
lf
or
ce
.
0%
fri
ct
1.
2.
3.
4.
In the terminology “a 500-N
block”, the 500-N refers most
specifically to the block's:
0%
ei
gh
bo
ve
.
t.
0%
ea
th
of
No
ne
e.
0%
fo
rc
as
s.
0%
w
mass.
force.
weight.
None of the above.
m
1.
2.
3.
4.
It is generally easier to overcome
friction when an object is moving than
at rest because …
0%
0%
he
n
an
o.
..
ob
.. .
ea
se
sw
he
n
de
cr
in
cr
Fg
0%
an
ha
n
ea
se
sw
gr
ea
te
rt
is
µs
µk
is
gr
ea
te
rt
ha
n
µs
µk
0%
Fg
1. µk is greater than µs
2. µs is greater than µk
3. Fg increases when
an object moves
4. Fg decreases when
an object moves
As a car coasts on a level road yet slows down,
the net force acting on the tires is:
fo
r
al
fo
rc
e
m
al
no
r
th
e
no
rm
th
e
o
lt
eq
ua
0%
ze
ro
.
0%
..
.. .
al
m
no
r
th
e
n
gr
ea
te
rt
ha
0%
ce
. ..
0%
tim
es
t
1. greater than the normal
force times the coefficient
of static friction.
2. equal to the normal force
times the coefficient of
static friction.
3. the normal force times the
coefficient of kinetic
friction.
4. zero.
If an object changes its direction of
motion:
0%
...
ha
ve
he
ce
m
us
t
of
t
sp
ee
d
0%
be
en
ob
je
ct
ob
je
ct
. ..
.. .
0%
he
th
e
in
th
e
th
e
m
as
er
ti
a
so
ft
of
t
he
ob
je
ct
h.
.
0%
af
or
1. the mass of the object
2. the inertia of the
3. the speed of the object
stays the same.
4. a force must have been
applied to the object.
If no forces are acting on an object,
its motion will:
1. continue in the same
direction with the same
speed.
2. slow down and eventually
stop.
3. continue at the same
speed but could change
direction.
4. continue in the same
direction but could change
speed.
0%
0%
0%
ue
co
n
tin
ue
in
at
di
r..
.
th
e
th
e
sa
m
sa
m
e
e
sp
...
l..
ev
en
tu
al
tin
co
n
w
slo
co
n
tin
ue
do
w
n
in
an
d
th
e
sa
m
e
di
r..
.
.
0%
If the net force is negative and the
speed is positive:
ed
i
im
m
sp
ee
d
w
ill
st
a
ill
w
sp
ee
d
th
e
0%
at
e.
.
...
yt
cr
ea
se
in
ill
w
sp
ee
d
th
e
0%
he
.. .
de
cr
ea
se
ill
w
sp
ee
d
th
e
0%
ov
..
0%
th
e
1. the speed will decrease
over time.
2. the speed will increase
over time.
3. the speed will stay the
same.
4. the speed will immediately
drop to zero.
Which of the following will not change
as you increase the slope of a ramp?
1. Normal Force
2. Fgx
3. coefficient of
friction
4. Fgy
0%
Fg
y
of
fri
ct
io
en
t
co
ef
fic
i
No
r
0%
n
Fg
x
0%
m
al
Fo
r
ce
0%
Which of the following about an object
on a ramp will increase if you decrease
the slope of a ramp?
lF
io
na
ta
t
Gr
av
i
0%
fF
r ic
t io
n
e
or
c
or
c
lF
0%
Fg
x
0%
e
0%
Co
ef
fic
ie
nt
o
Frictional Force
Gravitational Force
Fgx
Coefficient of
Friction
Fr
ict
io
na
1.
2.
3.
4.
What happens to the normal force as
the angle of a ramp increases?
0%
co
.. .
ns
re
m
m
al
fo
rc
e
No
r
No
r
m
al
fo
rc
e
de
cr
in
cr
al
fo
rc
e
m
No
r
0%
ea
se
s
ea
se
s
0%
ai
1. Normal force
increases
2. Normal force
decreases
3. Normal force
remains constant
What happens to the coefficient of
friction as the angle of a ramp
increases?
1. µ increases
2. µ decreases
3. µ remains constant
0%
ns
c
de
cr
ea
s
on
st
an
t
es
0%
µ
re
m
ai
µ
µ
in
cr
ea
se
s
0%
The gravitational force on an object is
98N. What is the object’s mass in kg?
98
9.8
980
10
0%
10
0%
98
0
0%
9.
8
0%
98
1.
2.
3.
4.
Fg
Fg sin10
Fg cos10
Fg tan10
FFr
0%
FF
r
an
10
0%
Fg
t
Fg
c
Fg
s
0%
os
10
0%
in
10
0%
Fg
1.
2.
3.
4.
5.
A 1000kg car is at rest on a slope of
angle 10o. What equals the normal
force?
A 1000kg car is at rest on a slope of
angle 10o. What equals the frictional
force?
Fg
Fg sin10
Fg cos10
Fg tan10
FFr
0%
FF
r
an
10
0%
Fg
t
Fg
c
Fg
s
0%
os
10
0%
in
10
0%
Fg
1.
2.
3.
4.
5.
```