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Forces Review
Which of the following is the cause of an acceleration or a change in an object’s motion?
speed
inerti
a fo
rce
velocit
y
0% 0%0%0%
1. speed2. inertia3. force4. velocity
Which of the following forces is an example of a field force?
gravit
ational force
fricti
onal force
normal
force
tensio
n
0% 0%0%0%
1. gravitational force2. frictional force3. normal force4. tension
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
0% 0% 0%0%0%
1. FA
2. FFr
3. FA – FN
4. FA – FFr
5. 0
An army ranger is lifted by a cable to a helicopter at a constant velocity?
FT Fg
FT –
Fg
Fg
– FT 0
0% 0% 0%0%0%
1. FT
2. Fg
3. FT – Fg
4. Fg – FT
5. 0
A bike is coasting to a stop. What is the net force equal to?
Grav
itational F
orce Zero
Fricti
onal Force
Norm
al Fo
rce
0% 0%0%0%
1. Gravitational Force2. Zero3. Frictional Force4. Normal Force
Which of the following is the tendency of an object to maintain its state of motion?
accelera
tion
inerti
a fo
rce
velocit
y
0% 0%0%0%
1. acceleration2. inertia3. force4. velocity
An object with a mass of 100kg has what weight in Newtons?
9.8 980 0500
25% 25%25%25%1. 9.82. 9803. 04. 500
With a constant applied force, mass is directly proportional to acceleration. This statement describes which of Newton’s Laws?
1st 2nd
3rd
None of t
he ab...
0% 0%0%0%
1. 1st2. 2nd3. 3rd
4. None of the above
If a nonzero net force is acting on an object, then the object is definitely
at rest.
moving w
ith a co
nstant ..
.
being acce
lerated.
losin
g mass.
0% 0%0%0%
1. at rest.2. moving with a
constant velocity.3. being accelerated.4. losing mass.
Which are simultaneously equal but opposite forces resulting from the interaction of two
objects?
net exte
rnal fo
rces
field force
s
gravit
ational force
s
action-re
action pairs
0% 0%0%0%
1. net external forces2. field forces3. gravitational forces4. action-reaction pairs
What is not true regarding action reaction forces?
They are an applic
ation ..
They act on th
e same ob...
They act on diff
erent ob...
All are tr
ue.
0% 0%0%0%
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
fricti
onal force
.
weigh
t.
inerti
a.
mass.
0% 0%0%0%
1. frictional force.2. weight.3. inertia.4. mass.
In the terminology “a 500-N block”, the 500-N refers most
specifically to the block's:
mass.
force
.
weigh
t.
None of t
he above.
0% 0%0%0%
1. mass.2. force.3. weight.4. None of the above.
It is generally easier to overcome friction when an object is moving than at rest because …
µk is
greater t
han µs
µs is g
reate
r than µk
Fg in
crease
s when an ob...
Fg d
ecrease
s when an o...
0% 0%0%0%
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:
greater t
han the norm
al ...
equal to th
e normal fo
rce...
the norm
al force
times t..
zero
.
0% 0%0%0%
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:
the m
ass of t
he object h..
the in
ertia of t
he object...
the sp
eed of the object
...
a force
must
have been ...
0% 0%0%0%
1. the mass of the object had to change.
2. the inertia of the object had to change.
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:
continue in
the sa
me dir...
slow down and eventu
all...
continue at t
he same sp
...
continue in
the sa
me dir...
0% 0%0%0%
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.
If the net force is negative and the speed is positive:
the sp
eed will
decrease
...
the sp
eed will
increase
ov..
the sp
eed will
stay t
he ...
the sp
eed will
immediat
e..
0% 0%0%0%
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?
Norm
al Fo
rce Fgx
coeffi
cient o
f fric
tion Fgy
0% 0%0%0%
1. Normal Force2. Fgx
3. coefficient of friction
4. Fgy
Which of the following about an object on a ramp will increase if you decrease the slope of a ramp?
Fricti
onal Force
Grav
itational F
orce Fgx
Coefficie
nt of F
riction
0% 0%0%0%
1. Frictional Force2. Gravitational Force3. Fgx
4. Coefficient of Friction
What happens to the normal force as the angle of a ramp increases?
Norm
al fo
rce in
crease
s
Norm
al fo
rce decre
ases
Norm
al fo
rce re
mains co...
0% 0%0%
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?
µ incre
ases
µ decrease
s
µ remains c
onstant
0% 0%0%
1. µ increases2. µ decreases3. µ remains constant
The gravitational force on an object is 98N. What is the object’s mass in kg?
98 9.8 980 10
0% 0%0%0%
1. 982. 9.83. 9804. 10
A 1000kg car is at rest on a slope of angle 10o. What equals the normal force?
Fg
Fg sin
10
Fg co
s10
Fg ta
n10 FFr
0% 0% 0%0%0%
1. Fg 2. Fg sin103. Fg cos104. Fg tan105. FFr
A 1000kg car is at rest on a slope of angle 10o. What equals the frictional force?
Fg
Fg sin
10
Fg co
s10
Fg ta
n10 FFr
0% 0% 0%0%0%
1. Fg 2. Fg sin103. Fg cos104. Fg tan105. FFr