Transcript SS Review for Final

Unit 1-3
Review
1
Ft = 50N
Mass = 4 kg, acceleration = 5m/s2 →
Find the weight - Fg (N)
2
Ft = 50N
Mass = 4 kg, acceleration = 5 m/s2
Fg = 40 N
What is the normal Force?
3
Ft = 50N
Mass = 4 kg, acceleration = 5 m/s2
Fg = 40 N
What is the net Force?
4
Ft = 50N
Mass = 4 kg, acceleration = 5 m/s2
Fg = 40 N, Fnet = 20 N
What is the frictional Force?
5
Ft = 50N
Mass = 4 kg, acceleration = 5 m/s2
Fg = 40 N, Fnet = 20 N, Ff = 30N
What is µ?
6
nd
2
and
rd
3
Law
Cannon and Cannonball
F=F
Ma = mA
7
Velocity is to speed as
displacement is to
(A) acceleration
(B) momentum
(C) time
(D) distance
Convert 50.1 km to m
9
An airplane travels at an average speed
of 400 mile/hour. How many hours will
it take the plane to fly 1200 miles?
10
A car accelerates from a position of
rest to 50 m/s in 20 seconds.
Determine the rate of acceleration in
2
m/s
11
A car accelerates from a position of
rest to 50 m/s in 20 seconds.
Determine the rate of acceleration in
2
2.5 m/s
Calculate the speed (m/s) of the car
at the end of the first 6 seconds.
12
The diagram shows a resultant vector,
R. Which diagram best represents
a pair of component vectors, A and B, that
would combine to form resultant vector R?
A person is standing on a bathroom scale
in an elevator car. If the scale reads a
value greater than the weight of the
person at rest, the elevator car could be
moving
(A) downward at constant speed
(B) upward at constant speed
(C) downward at increasing speed
(D) upward at increasing speed
The diagram represents the path of an object
after it was thrown. What happens to the
object’s acceleration as it
travels from A to B?
(A) It decreases.
(B) It increases.
(C) It remains the same.
A 0.2-kg red ball is thrown horizontally at a
speed of 4 m/s from a height of 3 meters. A 0.4kg green ball is thrown horizontally from the
same height at a speed of 8 m/s. Compared to
the time it takes the red ball to reach the
ground, the time it takes the green ball to reach
the ground is
(A) one-half as great
(B) the same
(C) twice as great
(D) four times as great
The acceleration due to gravity on the surface
of planet X is 19.6 m/s2. If an object on the
surface of this planet weighs 980 Newtons, the
mass of the object in kilograms is
The acceleration due to gravity on the surface
of planet X is 19.6 m/s2. How far will an object
fall in 3 seconds?
A basketball player jumped straight up to grab
a rebound. If she was in the air for 0.80
second, how long did it take to reach the top of
her jump?
A basketball player jumped straight up to grab
a rebound. If she was in the air for 0.80
second, how high did she jump?
The force required to start an object sliding across a
uniform horizontal surface is larger than the force
required to keep the object sliding at a constant
velocity. The magnitudes of the required forces are
different in these situations because the force of
kinetic friction
(A) is greater than the force of static friction
(B) is less than the force of static friction
(C) increases as the speed of the object relative to
the surface increases
(D) decreases as the speed of the object relative to
the surface increases
A man is pushing a baby stroller. Compared to
the magnitude of the force exerted on the
stroller by the man, the magnitude of the force
exerted on the man by the stroller is
(A) zero
(B) smaller, but greater than zero
(C) larger
(D) the same
A constant unbalanced force is applied to an
object for a period of time. Which graph best
represents the acceleration of the object as a
function of elapsed time?
The diameter of a United States penny is
closest to
(A) 100 m
(B) 10–1 m
(C) 10–2 m
(D) 10–3 m
During a 5.0-second interval, an object’s
velocity changes from 25 meters per
second east to 15 meters per second east.
Determine the magnitude of the object’s
acceleration in m/s2.
A projectile has an initial horizontal
velocity of 15 meters per second and an
initial vertical velocity of 25 m/s.
Determine the projectile’s horizontal
displacement (in m) if the total time of
flight is 5.0 seconds.
A projectile has an initial horizontal
velocity of 15 meters per second and an
initial vertical velocity of 25 m/s.
Determine the maximum height of the
projectile (in m) if the total time of flight
is 5.0 seconds.
A net force of 25 Newtons is applied
horizontally to a 10-kilogram block resting on
a table. What is the magnitude of the
acceleration of the block?
(A) 0.0 m/s2
(B) 0.40 m/s2
(C) 0.26 m/s2
(D) 2.5 m/s2
The speed of a car is increased uniformly from
20 meters per second to 30 meters per second
in 4.0 seconds. The magnitude of the car’s
average acceleration in this 4.0-second interval
is
(A) 0.40 m/s2
(B) 10 m/s2
(C) 2.5 m/s2
(D) 13 m/s2
A box is at rest on an inclined plane. Which
vector best represents the direction of the
normal force acting on the box?
(A) A
(B) B
(C) C
(D) D
If the magnitude of the gravitational force
of Earth on the Moon is F, the magnitude
of the gravitational force of the Moon on
Earth is
(A) smaller than F
(B) larger than F
(C) equal to F
Which term represents a scalar
quantity?
(A) distance
(B) force
(C) displacement
(D) weight
An apple weighing 1 Newton on the
surface of Earth has a mass of
approximately
(A) 1×10–1 kg
(B) 1×100 kg
(C) 1×101 kg
(D) 1×102 kg
In which situation is the net force on the object
equal to zero (mechanical equilibrium)?
(A) a satellite moving at constant speed around
Earth in a circular orbit
(B) an automobile braking to a stop
(C) a bicycle moving at constant speed on a
straight, level road
(D) a pitched baseball being hit by a bat
A 10.0-kilogram mass are held at rest on a
frictionless 30.0° incline by force F. What is the
approximate magnitude of force F?
(A) 9.81 N
(B) 85.0 N
(C) 49.1 N
(D) 98.1 N
The graph shows the velocity of a race car
moving along a straight line as a function of
time. What is the magnitude of the
displacement of the car
from t = 2.0 seconds to
t = 4.0 seconds?
(A) 20 m
(B) 40 m
(C) 60 m
(D) 80 m
36
Which vector diagram represents the greatest
magnitude of displacement for an object?
A child is flying a kite, K. A student at point B, located
100. meters away from point A (directly underneath the
kite), measures the angle of elevation of the kite from
the ground as 30°. Determine the height, AK, in meters
of the kite.
A child is flying a kite, K. A student at point B, located
100. meters away from point A (directly underneath the
kite), measures the angle of elevation of the kite from
the ground as 30°. A small lead sphere is dropped from
the kite. Calculate the amount of time required for the
sphere to fall to the ground.
A car traveling on a straight road at
15.0 m/s accelerates uniformly to a speed
of 21.0 m/s in 12.0 seconds. What is the
acceleration in m/s2?
A golf ball is hit with an initial velocity of 15
m/s at an angle of 35 degrees above the
horizontal. What is the vertical component of
the golf ball’s initial velocity in m/s?
A golf ball is hit with an initial velocity of 15
meters per second at an angle of 35 degrees
above the horizontal. What is the horizontal
component of the golf ball’s initial velocity?
Goofy the clown is working in Lost
Wages & wants to jump off the top of
the Bellagio which is 155-m tall and
land in the pool which is 21-m away
from the base of the hotel.
How many seconds will Goofy be
falling?
Goofy the clown is working in Lost Wages
& wants to jump off the top of the Bellagio
which is 155-m tall and land in the pool
which is 21-m away from the base of the
hotel.
t = 5.6 s
How fast will Goofy need to run (m/s) so
he does not hit the concrete between the
hotel and the pool?
•For his next stunt, Goofy wants to
be shot out of a cannon and land in a
barrel of water. Goofy will leave the
cannon at 100 m/s at an angle of 45o.
What is Goofy’s vertical velocity as
he leaves the cannon?
45
For his next stunt, Goofy wants to be
shot out of a cannon and land in a
barrel of water. Goofy will leave the
cannon at 100 m/s at an angle of 45o.
vv = 70.7 m/s
How many seconds will it take
Goofy’s to reach his maximum
height?
46
For his next stunt, Goofy wants to be
shot out of a cannon and land in a
barrel of water. Goofy will leave the
cannon at 100 m/s at an angle of 45o.
vv = 70.7 m/s, t = 7.1 s
What is the minimum height for the
tent so Goofy does not scrape the
top?
47
For his next stunt, Goofy wants to be
shot out of a cannon and land in a
barrel of water. Goofy will leave the
cannon at 100 m/s at an angle of 45o.
vv = 70.7 m/s, t = 7.1 s, y = 250 m
What is Goofy’s horizontal velocity
(m/s) as he leaves the cannon?
48
For his next stunt, Goofy wants to be
shot out of a cannon and land in a
barrel of water. Goofy will leave the
cannon at 100 m/s at an angle of 45o.
vv = 70.7 m/s, t = 7.1 s, y = 250 m
vH = 70.7 m/s
How far from the cannon does the
barrel of water need to be placed?
49
In a plane that goes 310 m/s the pilot
wants to fly directly north when the
wind is blowing at 155 m/s from the
east.
(a) In what direction must he head the
plane?
50
In a plane that goes 310 m/s the pilot
wants to fly directly north when the
wind is blowing at 155 m/s from the
east.
(a) In what direction must he head the
plane?
Angle = 30 degrees
(b) How fast will the plane be going
north?
51
An airplane descending to the runway
at 250 m/s is going at an angle of 22o
with the horizontal. Find
(a) Its horizontal velocity (m/s)
52
An airplane descending to the runway
at 250 m/s is going at an angle of 22o
with the horizontal. Find
(a) Its horizontal velocity
vh = 232 m/s
(b) Its vertical velocity
.
53
A rock is thrown horizontally at 25 m/s
from a roof that is 75 m high. How
many seconds does it take to hit the
ground?
54
A rock is thrown horizontally at 25 m/s
from a roof that is 75 m high. How long
does it take to hit the ground?
t = 3.9 s
How far does the rock go horizontally
before hitting the ground?
55
A football punter kicks a ball at 40 m/s at an
angle of 50o.
(a) What is the ball’s initial vertical velocity?
56
A football punter kicks a ball at 40 m/s at an
angle of 50o.
(a)What is the ball’s initial vertical velocity?
Vv = 30.6 m/s
(b) What is the ball’s initial horizontal velocity?
57
A football punter kicks a ball at 40 m/s at an
angle of 50o.
(a)What is the ball’s initial vertical velocity?
Vv = 30.6 m/s
(b)What is the ball’s initial horizontal velocity?
Vh = 25.7 m/s
(c) How long until it reaches the top of its flight?
58
A football punter kicks a ball at 40 m/s at an
angle of 50o.
(a)What is the ball’s initial vertical velocity?
Vv = 30.6 m/s
(b)What is the ball’s initial horizontal velocity?
Vh = 25.7 m/s
(c) How long until it reaches the top of its flight?
t = 3.1 s
(d) How high does it go?
59
A football punter kicks a ball at 40 m/s at an
angle of 50o.
(a)What is the ball’s initial vertical velocity?
Vv = 30.6 m/s
(b)What is the ball’s initial horizontal velocity?
Vh = 25.7 m/s
(c) How long until it reaches the top of its flight?
t = 3.1 s
(d) How high does it go?
y = 47m
(e) How long until it hits the ground?
60
A football punter kicks a ball at 40 m/s at an
angle of 50o.
(a)What is the ball’s initial vertical velocity?
Vv = 30.6 m/s
(b)What is the ball’s initial horizontal velocity?
Vh = 25.7 m/s
(c) How long until it reaches the top of its flight?
t = 3.1 s
(d) How high does it go?
y = 47m
(e) How long until it hits the ground?
t = 6.1 s
61
(f) What is the total distance that it travels?