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Phys - Unit 3 Dynamics Review
Phys - Unit 3 Dynamics Review
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physics
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32 cards
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Questions
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Answers
1
When drawing a free body diagram, what must be remembered?
The direction of the forces
All of the above
The magnitude of the forces
The total number of forces on an object
2
For a stationary object, the force of
gravity
is
opposed
by
Air resistance
Normal force
Friction
Weight
3
A 5 kg block is pulled with a constant force of 55 N. Find
ACC
.
11 m/s2
5 m/s2
10 m/s2
0 m/s2
4
If a 2000 kg truck collides with a 900 kg car...
The truck experiences a greater impact force
The car experiences a greater impact force
Both the forces cancel and are therefore 0
Both the forces are equal
5
What does “
sigma
” mean?
Greater than
less than
The product of
The sum of
6
What are the
units
of
acceleration
?
N
g
m/s2
Kg
7
One force is 71N to the West and the other force is 49N to the East. What is the
Σ FORCE
?
-22 N
71 N
-32 N
120 N
8
A puck that is sliding freely on ice. What direction is it moving; what force is labeled X?
Left; force applied
Right; Friction
Right; force applied
Left; friction
9
One force is 3 N to the
north
and the other force is 9N to the
north
. What is the
NET FORCE
?
3 N
27 N
12 N
6 N
10
Force
is a
scalar
.
True
False
11
With what
FORCE
does a boy push a 3 kg box at 8 m/s
2
?
3/8 N
11 N
24 N
8/3 N
12
Inertia
is
A universal constant
A force
Tendency to resist a change in motion
Tendency to produce a force
13
What DIRECTION is the
NORMAL force
on this ball?
straight down
down and to the left
up and to the right
straight up
14
If a box is being pulled with 50 N BUT DOES NOT ACCELERATE, which value CHANGES?
Distance traveled
Mass
Velocity
Gravity
15
Who is the “
father of physics
”?
Newton
Joule
Galileo
Chinskey
16
Which of Newton’s Laws states that the
net
force
equals
mass x acceleration
?
4th
2nd
1st
3rd
17
The unit for the
Normal force
is...
kg
N
m/s2
μ
18
What is the
NORMAL force
of a 14 N object on a table?
140 N
14 N
1.4 N
10 N
19
If acceleration is 4 m/s
2
and F=20 N, what is
MASS
?
5 kg
100 kg
10 kg
4 kg
20
A 4kg object is is pushed with a 24N RIGHT & a 32N LEFT. What's the
NET FORCE
?
56 N right
8 N left
4N left
2 N right
21
A 4.0 kg object is being acted on by a 8N force. What is the
ACCELERATION
of the object?
56 m/s2
2 m/s2
8 m/s2
4 m/s2
22
The coefficient of friction is 0.4 and Force of friction is 100 N. What's the
normal force
?
4000 m/s2
4000 N
250 N
0.004 N
23
What's the
weight
if the friction force is 50N & coefficient of friction is 0.33
151.5 N
16.5 N
1.7 N
1484.8 N
24
How much
FORCE
is required to move a 6 kg toy car, at rest to a velocity of 2 m/s in 4 s?
2.5 N
3 N
0 N
2 N
25
A 40N force to the right accelerates an object 10 m/s
2
. Find the
MASS
.
10 kg
1 kg
4 kg
7 kg
26
What is
μ
if a 44 N object has a force of friction of 27 N?
17
1188
1.6
0.6
27
Which of the following properties of an object is likely to
change on another planet
?
Hairiness
body odor
Mass
Weight
28
A 22 N force acts on an object of 1 kg. What is the magnitude of
ACCELERATION
?
120 m/s2
32 m/s2
71 m/s2
22 m/s2
29
What is the
force of gravity (g)
of a 1 kg ball?
9.8 N down
0 N
8.9 N down
1.1 N up
30
What is the
NORMAL force
of a 3 kg book sitting on a table?
3 kg
3 N
0 N
29.4 N
31
The direction of the acceleration vector is in the
OPPOSITE
direction of the net force.
False
True
32
What is the
WEIGHT
of a .005 kg quarter?
0.045 N
45 N
4.5 N
0.45 N
