ATEST Attempt 1 62 minutes 68 out of 75
Correct answers are hidden.
Score for this quiz: 68 out of 75
Submitted Jan 26 at 8:40am
This attempt took 62 minutes.
Question 1
2 / 2 pts
Starting from rest, a 20,000-kg aircraft being launched from an aircraft carrier goes from 0 to 90
m/s in 2 seconds. The net force acting on the aircraft is
3,600,000 N.
1,800,000 N.
900,000 N.
450,000 N.
275,000 N.
Rationale:
F = ma; a = change in velocity/change in time = 90 m/s / 2 seconds = 45 m/s2 F = 20,000 kg x 45
m/s2 = 900,000 N
Question 2
2 / 2 pts
Starting from rest, a 2-kg body acquires a speed of 8 m/s in 2 seconds. The net force acting on
the body is
2 N.
4 N.
8 N.
16 N.
6 N.
Question 3
2 / 2 pts
Planetary orbits are
parabolas.
ellipses.
circles.
none of the above.
Question 4
2 / 2 pts
If object A has more mass than object B,
A will weigh more than B.
A will be harder to accelerate than B.
A will be harder to keep moving in a circle.
all of the above
Question 5
2 / 2 pts
Two identical airplanes are executing identical turns around a pylon. One of them is moving at
200 mph, and the other is moving at 100 mph. The centripetal force acting on the airplane
moving at 200 mph is __________ the value of the centripetal force acting on the airplane
moving at 100 mph.
one quarter
one half
the same as
twice
four times
Rationale:
Centripetal force = mv2 / r; since v1 = 2v2 ; the force is (2)2 or 4 times as great.
Question 6
2 / 2 pts
You throw a ball straight up, it peaks out, and then comes back down to you. During this motion,
the velocity and acceleration
always point in the same direction.
always point opposite to each other.
sometimes point in the same direction, and other times point opposite to each other.
depend on the way the ball is thrown.
depend on the mass of the ball.
Question 7
2 / 2 pts
An aircraft weighs 1,500 N, its mass is
1,500 kg.
750 kg.
153 kg.
mass cannot be determined
Rationale:
m = w/g = 1500 kg m/s2 / 9.8 m/s2 = 153.06 kg
Question 8
2 / 2 pts
Two cars crash head on. At any given time during the crash, the magnitudes of the collision
forces exerted on each car are exactly equal. This is an example of Newton’s
first law.
second law.
third law.
no law.
Question 9
2 / 2 pts
During the period of one day, the number of high tides at a given point is about
one.
two.
three.
four.
none of the above.
Question 10
2 / 2 pts
For this situation, I push on a heavy chair.
Suppose I push moderately on the chair, and this time the chair does move. Then the strength of
the force the chair exerts on me is
less than the force I exert on the chair.
equal to the force I exert on the chair.
greater than the force I exert on the chair.
zero.
Question 11
2 / 2 pts
Tides are influenced by
the Moon.
the Sun.
the uneven surface of the Earth.
all of the above.
none of the above.
Question 12
2 / 2 pts
Isaac Newton’s contributions to physics include
the laws of motion.
the law of universal gravitation.
invention of the calculus.
the invention of the reflecting telescope.
all of the above.
Question 13
2 / 2 pts
You whirl a 2-kg body attached to a 1-meter cord around your head in a nearly horizontal circle
with a speed of 4 m/s. The tension in the cord is
2 N.
4 N.
8 N.
16 N.
32 N.
Question 14
2 / 2 pts
As a body falls through air starting from rest, its velocity
stays constant.
continuously decreases.
continuously increases.
gets larger and larger, eventually reaching a constant value.
gets smaller and smaller, eventually approaching zero.
Question 15
2 / 2 pts
The vertical acceleration of a projectile
equals g pointing downwards.
equals g pointing upwards.
equals g pointing sometimes upwards and other times downwards.
is zero.
continuously increases.
Question 16
2 / 2 pts
To hold a 5 lb bag of sugar in your hand, you must push upwards on it with a force of 5 lb. This
is an example of Newton’s third law.
True
False
Question 17
2 / 2 pts
A body is oscillating up and down at the end of a spring. Let’s consider when the body is at the
top of its up-and-down motion.
The displacement vector from the equilibrium position has its largest magnitude.
True
False
Question 18
2 / 2 pts
You push on a wall, and the wall pushes back on you with the same force. This is an example of
Newton’s third law.
True
False
Question 19
2 / 2 pts
A ball on a string is being whirled around overhead when the string breaks. The ball will move
in the direction of the centripetal force the moment the string breaks.
True
False
Rationale:
False, the ball will move in the direction of the velocity vector when the string breaks.
Question 20
2 / 2 pts
Gravity acts over a limited distance range.
True
False
Question 21
2 / 2 pts
A body is oscillating up and down at the end of a spring. Let’s consider when the body is at the
top of its up-and-down motion.
The net force on the body has its largest magnitude.
True
False
Question 22
2 / 2 pts
All forces have specific directions associated with them.
True
False
Question 23
2 / 2 pts
With a fixed force, you will impart the same acceleration to a body on the Earth and on the
Moon.
True
False
Question 24
2 / 2 pts
As you go from a point where a gravitational field is strong to a point where the gravitational
field gets weaker, the gravitational field lines get farther apart.
True
False
Question 25
2 / 2 pts
A body is oscillating up and down at the end of a spring. Let’s consider when the body is at the
top of its up-and-down motion.
The acceleration is zero.
True
False
Question 26
15 / 15 pts
Select the closest matching pairs possible. 3 pts for each response.
Newton's First Law
An object remains in motion or at rest unless acted upon by an exterior Force
Newton's 2nd Law
F=ma
Newton's 3rd Law
If object A causes a force on object B, then object B exerts an equal force in the opposite
direction on A
Newton's Law of Universal Gravitation
Every object exerts a gravitational pull on every other object.
Hooke's Law
F=-kd
Question 27
3 / 10 pts
From 2 King 6:1-6, one of the disciples of Elisha was cutting a tree and the ax head fell into the
water. While we do not know how high the ax head was when it fell into the water, we will work
through a physics example of the ax head's vertical motion as if it were dropped into the water.
Write your name and due date for this quiz. The due date of this assignment multiplied by 2 is
the height the ax head falls from in meters into the water. For example, if the due date is July 15,
then the ax head fell 30 meters to the water. Unless the due date is the 15th of the month do not
use 30 for the height of the ax head.
Write Newton’s three laws in no more than 3 sentences.
Given the ax head mentioned in the opening portion with the height being equal in numerical
value of the due day of this assignment multiplied by 2. How long does it take for the ax to fall
to the river surface?
Compute the final speed of the ax head when it hits the water.
What was the average speed of the ax head?
Newton's Laws Quiz Q25.jpeg
units for 54 missing meters. Parts 3-5 incorrect.
Quiz Score: 68 out of 75
