General Physics 1B Flashcards
(100 cards)
1
Q
can be described by the horizontal and vertical components of motion
A
Projectile Motion
2
Q
an object thrown horizontally or at an angle other than 90 degrees with the horizontal which follows a curved path and moves under the sole influence of gravity
A
Projectile
3
Q
Projectile Motion is a combination of free fall and horizontal motions which are ______________ of each other
A
independent
4
Q
highest point attained by a body
A
Maximum Height (dy)
5
Q
horizontal distance covered by the body
A
Range (R/dx)
6
Q
the time that the object is in the air
A
Time of flight (t/ ‘t)
7
Q
The characteristics path followed by a projectile is
A. its trajectory
B. a range
C. Both
D. Neither
A
A
8
Q
the body that follows a curve path
A
Projectile
9
Q
An arrow that leaves the bow moves
A. in a curved path toward the target
B. in a straight horizontal path toward the target
C. Both
D. Neither
A
A
10
Q
In projectile motion,
A. the horizontal and vertical motions are both accelerated
B. the horizontal and vertical velocities are independent of each other
C. Both
D. Neither
A
B
11
Q
The projectile motion refers to the
A. vertical motion of an object
B. horizontal motion of an object
C. Both
D. Neither
A
C
12
Q
The time of flight
A. is the time that the projectile is in the air
B. can be calculated using the first equation d = 1/2gt^2
C. Both
D. Neither
A
C
13
Q
The horizontal velocity in PM 1 is __________.
A
constant
14
Q
What is the acceleration of the projectile motion at the maximum height?
A
9.8 m/s^2
15
Q
vertical distance is called ____.
A
Maximum Height (dy)
16
Q
velocity at the vertical motion _______.
A
varies
17
Q
path traced by an object acceleration only in the vertical direction while moving at constant horizontal velocity (vx)
A
Parabolic
18
Q
What is the vertical velocity at the maximum height?
A
0
19
Q
If the object goes up its…
A. velocity is decreasing and has positive constant (9.8m/s^2)
B. velocity is increasing and has positive constant (9.8m/s^2)
C. velocity is increasing and has negative constant (9.8m/s^2)
D. velocity is decreasing and has negative constant (9.8m/s^2)
A
D
20
Q
If object goes down its…
A. velocity is decreasing and has negative constant (9.8m/s^2)
B. velocity is decreasing and has positive constant (9.8m/s^2)
C. velocity is increasing and has positive constant (9.8m/s^2)
D. velocity is increasing and has negative constant (9.8m/s^2)
A
C
21
Q
motion of an object in a circle with constant speed
A
Uniform Circular Motion (UCM)
22
Q
Forces found in the UCM
A
Centripetal Force and Centrifugal Force
23
Q
pull on the body
A
Centripetal Force (Fc)
24
Q
not a real force
A
Centrifugal Force
25
force that moves toward the center of the circle
Centripetal Force (Fc)
26
feeling due to inertia
Centrifugal Force
27
force that moves away from the center of the circle
Centrifugal Force
28
velocity tangent to the circle at a point in time
Linear Velocity or Tangential Velocity (v)
29
An acceleration that is pointing towards the center of the circle.
Centripetal Acceleration (Ac)
30
In UCM, speed is ___________.
constant
31
In UCM, direction of the vector is ______________.
not constant
32
In UCM, velocity is ___________.
not constant
33
Centripetal Force and Centripetal Acceleration points _____________.
toward the center
34
In a uniform circular motion, how does the velocity change?
A. It changes its speed
B. It changes its direction
C. It changes both speed and direction
D. It does not change speed or direction
B
35
On a curve, why is the outer rail of a railroad track higher than the inner rail?
A. Because the centripetal force must be higher than the centrifugal force.
B. Because the centripetal force must be lower than the centrifugal force.
C. Because the centripetal force must be equal to the centrifugal force.
D. Insufficient data
C
36
What is the direction of the force that acts on the clothes in the spin cycle of a washing machine?
A. The force is towards the clothes.
B. The force is away from the clothes.
C. The fore is towards the center.
D. Both B and C
A
37
Which of the following statements holds TRUE for an object in uniform circular motion?
A. Its acceleration is uniform.
B. Its velocity is uniform.
C. The force acting on it is uniform.
D. It is continuously acted upon by a net central force.
D
38
When a car turns around a curve and doubles its speed, what can be said about the forces between its wheels and the road?
A. They will become double.
B. They will increase fourfold.
C. They will be reduced to one-half.
D. They will be reduced to one-fourth.
B
39
A stone tied to a string is whirled along a horizontal circle with a uniform speed. If the string suddenly breaks, how will the stone move?
A. It will fall vertically downward.
B. It will move along a trajectory.
C. It will continue to move along a circular path.
D. It will move in a straight line tangent to its circular path.
D
40
Centripetal force is equal to the centrifugal force.
Sometimes
41
If the velocity of the object is high, the centripetal force is also high.
Always
42
Centripetal force and centrifugal force move in opposite directions.
Always
43
If period is great, the frequency is high.
Never
44
Centripetal force and centrifugal force push against each other.
Never
45
The velocity of a whirling object is constant
Never
46
indicates that whatever an object accelerates, there must be a net fore to create acceleration.
Newton's Second Law of Motion
47
provided by the friction force between the tires and the road
Required Force
48
are forces that intersect at a single point
Concurrent Forces
49
the point where the weight of a body seems to be concentrated
Center of Gravity
50
at rest
Static
51
balanced
Equilibrium
52
a condition in which the body is at rest because there is no net force acting on it
Static Equilibrium
53
a solid body in which deformation is zero or so small can be neglected
Rigid Body
54
When the resultant of all forces acting on a body is zero?
A. When the body has constant velocity.
B. When the body has a constant acceleration.
C. When the body is in equilibrium condition.
D. When the body is at rest.
C
55
Why are doorknobs placed near the edge of a door than at the center?
A. To increase the amount of force in opening the door.
B. To lessen the amount of force in opening the door.
C. To increase the lever arm of the door.
D. To make the door look better
B
56
Montagne is lighter than Jeremiah. When can they balance themselves on a seesaw?
A. Montagne sits nearer the center than Jeremiah.
B. Jeremiah sits nearer the center than Montagne.
C. Montagne and Jeremiah sit at opposite ends of the seesaw.
D. Montagne and Jeremiah sit on the same side of the seesaw.
B
57
Condition/s to be satisfied for static equilibrium
A. The sum of the torques at any point must be zero
B. The sum of the clockwise torques must be equal to the sum of the counterclockwise torques
C. Both
D. Neither
C
58
Concurrent forces...
A. Lines of action do not meet at a common point
B. Can cause rotation of objects
C. Both
D. Neither
D
59
Lever arm refers to...
A. Any distance of the force from the pivot point
B. Measure in meters
C. Both
D. Neither
C
60
Parallel forces...
A. Act in the same or opposite direction
B. Produces linear motion
C. Both
D. Neither
C
61
Torque...
A. Equal to the product of the magnitude of the force and the length of the lever arm on which its acts
B. Its unit is (N)(m)
C. Both
D. Neither
C
62
If the net force acting on a body is zero, the net torque is also zero.
Always
63
If an object is at rest, no forces are acting on it.
Never
64
Weight is directed downward.
Always
65
The normal force exerted by a surface is equal to the weight of an object.
Sometimes
66
Unequal weights may not be balanced on a seesaw
Sometimes
67
State of equilibrium that cannot be flopped down easily.
Stable Equilibrium
68
State of equilibrium that can be easily flopped down.
Unstable Equilibrium
69
State of equilibrium that roll from one side to the other side
Neutral Equilibrium
70
Type of static equilibrium that neither the body rotates or tilts at any direction
Rotational Equilibrium
71
Type of static equilibrium that remains at rest
Translational Equilibrium
72
the vector summation of all forces acting on the system must be zero
First Condition of Equilibrium
73
states that the sum of all torque must be equal to zero
Second Condition of Equilibrium
74
is the product of the force and its lever arm
Torque
75
clockwise
negative
76
counter-clockwise
positive
77
the energy transformed to or form an object via the application of force along a displacement
Work
78
the ability to do work
Energy
79
done on an object when a force causes a displacement of the object
Work
80
work done is _____ if the displacement is either zero or perpendicular to the force
zero
81
work done is _______ if the force and displacement have the same direction.
positive
82
work done is _______ if the force and displacement have the opposite direction.
negative
83
A stone is thrown horizontally at 15m/s from the top of the cliff 44m high.
a. How long does the stone take to reach the bottom of the cliff?
b. How far from the base of the cliff does the strike the ground?
a. t = 3.0s
b. dx = 45m
84
A ball is thrown with an initial velocity of 4.47 m/s at an angle of 66 degrees above the horizontal.
a. How long does it take the ball to land?
b. How high does the ball fly?
c. What is the range?
a. t' = 0.83s
b. dy = 0.85m
c. R/dx = 1.51m
85
A dart is projected upward at an angle of 20 degrees with the horizontal. It has an initial velocity of 20 m/s.
a. In how many seconds will it reach the target?
b. How far from the point of projection will it strike?
a. t' = 1.40s
b. R/dx = 26.31m
86
The barrel of a rifle is aimed directly at the bull's-eye of a target 50m away. If the bullet's speed is 350m/s, how far below the bull's-eye does the bullet strike the target?
dy = 0.098m
87
After closing a deal with a client, Eugene leans back on his swivel chair and spins around with a frequency of 0.5Hz. What is Eugene's period of spin?
T = 2s
88
Elvis' favorite disco record has a scratch 12cm from the center that makes the record skip 45 times each minute.
a. What is the frequency of the record?
b. What is the linear speed of the scratch as it turns?
a. f = 0.75Hz
b. v = 0.57m/s
89
Cess' favorite ride at EK is the rotor, which has a radius of 4.0m. The ride takes 2.0s to make one full revolution.
a. What is Cess' linear speed on the rotor?
b. What is Cess' centripetal acceleration on the rotor?
c. What is the force exerted by the rotor if Cess weighs 50 kg?
a. v = 12.57m/s
b. Ac = 39.50m/s^2
c. Fc = 1975 N
90
A gong is suspended by two ropes. One makes an angle of 30 degrees with the vertical and is under the tension of 95N. The other rope makes an angle of 50 degrees with the vertical. Find the weight of the gong and the tension in the second rope.
a. Weight of the gong
b. Tension of the second rope
a. Wy = 122.13N
b. T2 = 62.01N
91
A 30-ton uniformly paved bridge spans 1/4km. Twenty meters from one end of the bridge, a 5-ton truck is parked. Thirty meters from the other end is 3-ton car. How much force does the support at each end of the bridge exert?
FB = 176 792N ; FA = 195 608N
92
A car weighing 2000N on a bridge is 6m from one of the bridge piers and 4m from the other. How much force does each pier of the bridge exert to support the car?
FB = 1200N ; FA = 800N
93
A girl pushes a pencil box by applying force of 20N. Find the work done by this force as the pencil box is displaced through 25cm along the path.
W = 5J
94
If the work done by a force in moving a body through a distance of 15cm is 30 J, what is the magnitude of the force?
F = 200N
95
A rifle can shoot a 4.2g bullet at a speed of 965m/s. If the work on the bullet is done over a distance of 0.75m, what is the average force on the bullet?
F = 2607.43N
96
Projectile motion is a combination of vertical and horizontal motions that are completely dependent on each other.
TRUE or FALSE?
FALSE (independent)
97
The horizontal velocity in PM1 is constant.
TRUE or FALSE?
TRUE
98
Projectile motion is a body that is given an initial velocity and is allowed to move under the sole influence of gravity.
TRUE or FALSE?
FALSE (Projectile)
99
The range is the horizontal distance covered by the projectile.
TRUE or FALSE?
TRUE
100
Projectory is the path of a projectile.
TRUE or FALSE?
FALSE (Trajectory)
