The document contains 22 multiple choice questions testing knowledge of physics concepts like motion, forces, gravity, and kinematics. The questions assess understanding of topics such as perpetual motion machines, Galileo's experiments, velocity and acceleration of falling objects, projectile motion, and the effects of varying gravitational acceleration on mass and weight.

1. Test 1
1.The inventor of a perpetual motion machine consults four scientists about
his invention. Here are their statements. Which statement is definitely wrong?
a. I do not understand how it works.
b. There is almost no chance that it will work.
c. It is scientifically proven that such machines never work. correctchoice{}
d. I'm busy. Go away.
2 Galileo arrived at conclusions about nature by
a. pure reason alone.
b. a combination of reason and passive observation.
c. appeal to religious authority.
d. active experimentation. correctchoice{}
3 Galileo asserted that a moving object
a. requires a force to keep moving.
b. does not require a force to keep moving. correctchoice{}
c. always come to rest eventually.
4 A ball is thrown straight up. It turns out to be convenient to measure
distance upward from the launch point. Which of the following
values might describe the position of the ball when it starts its trip?
a. h=+2m.
b. h=0. correctchoice{}
c. h=-2m.
5 A ball is thrown straight up. It turns out to be convenient to measure time
from the instant that it starts. Which of the
following values might describe the instant that it starts its trip?
a. t= 0 s.
b. t= -2s
c. t = +2s. correctchoice{}

2. 6. A submarine is at a depth of 400 feet below sea level at 2:02 PM and at 700 feet below sea level
at 2:08 PM. Its upward velocity component is
a. 500 ft/min
b. 200 ft/min
c. -300 ft/min
d. -50 ft/min. correctchoice{}
e. 50 ft/min.
7. An object is thrown upwards from the edge of a desk. The object travels for 5 meters upwards,
stops, and then falls on the floor which is 3 meters below the desk. Assume the vertical positive axis
to point downwards and the origin of the coordinates to be at the surface of the desk (i.e., at the
launching point). Under this assumption, the coordinates of the point where the object stops in mid-
air before starting falling and where it lands are
a. +5m, -3m.
b. -5m, -3 m.
c. +5m, +3 m.
d. -5m, +3m. correctchoice{}
8. A cannon shoots a shell up with an initial vertical velocity component of
400m/s and an initial horizontal component of 500m/s. Neglecting air
resistance and the curvature of the Earth, how far away from the cannon will
the shell hit?
a. 50,000m.
b. 20,000m.
c. 40,000m. correctchoice{}
d. 80,000m.
9. A bomber is approaching its target in straight and level flight. The
altitude of the bomber is such that a bomb will take four minutes to fall.
The bombardier should release the bombs
a. at the instant that the plane is passing over the target.
b. one minute before the plane passes over the target.
c. two minutes before the plane passes over the target.
d. three minutes before the plane passes over the target.
e. four minutes before the plane passes over the target. correctchoice{}

3. 10. Find the weight in Newtons of an 8 kilogram object on the surface of the Earth.
a. 80 N correctchoice{}
b. 800 N
c. 0.16 N
d. 8 N.
e. 8000 N
11 Consider two stones, one with twice the mass of the other.
If you throw each stone equally hard,
a. The more massive stone will accelerate more.
b. The less massive stone will accelerate more. correctchoice{}
c. Both stones will be accelerated to the same speed.
12. If the acceleration of an object is zero, its velocity
a. must be zero.
b. will not change. correctchoice{}
c. will increase.
d. will decrease.
13. Assume that a car is traveling on a road. The coefficient of friction µ between the tires and the
asphalt depends on
a. The type of rubber making up the tires.
b. The weather conditions.
c. The weight of the car.
d. The type of asphalt
e. All of the above. correctchoice{}
14. If air resistance is neglected, how long will it take for an object falling from rest
to reach a speed of 100m/s ?
a. 1s.
b. 10s. correctchoice{}
c. 20s.
d. 100s.

4. 15. A man is trying to push a railroad car along a level track. He is able to
exert a horizontal force of about 1000N and the friction force is
negligible. If the mass of the railroad car is 100,000 kg, it will accelerate along the track at
a. 0 m/s2
b. 100 m/s2
c. 0.01 m/s2
correctchoice{}
d. 0.009 m/s2
e. 90 m/s2
.
16. The following quantities relate to the rate of change of position. Which pair will always have
the same magnitude?
a. Average speed and average velocity.
b. Average speed and instantaneous speed.
c. Average velocity and instantaneous velocity.
d. Instantaneous speed and instantaneous velocity. correctchoice{}
17. A bullet is fired straight down from a hovering helicopter. If we neglect air friction, then the
velocity of the bullet
a. is a constant.
b. increases at 10 m/s each second. correctchoice{}
c. decreases at 10 ft/s during the flight.
d. is zero.
18. The gravitational acceleration is different on Earth and the Moon.
On Earth, g = 10 m/s2
. On the Moon, g is reduced. Assume you transport a 1 kg mass from Earth to
the Moon. What would happen to the mass? To the weight?
a. Mass changes, weight remains the same.
b. Mass remains the same, weight decreases. correctchoice{}
c. Mass remains the same, weight increases.
d. Mass increases, weight increases.
19. A cannon shoots a shell straight up at an initial speed of 300m/s. If air resistance can be
neglected, which speed will it have when it comes back down?
a) 20m/s.
b) 30m/s.
c) 300m/s.
d) 600m/s.
e) 500m/s.

5. 20. A ball is thrown upwards (vertically). What is its velocity at the top of the trajectory?
a) Donnow.
b) Undetermined since you did not specify the launch velocity.
c) Zero. correctchoice{}
21. A ball is thrown upwards and the launch direction forms an angle of 45
degrees with the horizontal. What is its speed at the top of the trajectory?
a) Donnow.
b) Undetermined since you did not specify the launch velocity. correctchoice{}
c) Zero.
22. The gravitational acceleration is different on Earth and the Moon.
On Earth, g = 10 m/s2 . On the Moon, g is reduced. Assume you transport a 1 kg mass from Earth
to the Moon. What would happen to the mass? To the weight?
a) Mass changes, weight remains the same.
b) Mass remains the same, weight decreases.
c) Mass remains the same, weight increases.
d) Mass increases, weight increases.

6. 20. A ball is thrown upwards (vertically). What is its velocity at the top of the trajectory?
a) Donnow.
b) Undetermined since you did not specify the launch velocity.
c) Zero. correctchoice{}
21. A ball is thrown upwards and the launch direction forms an angle of 45
degrees with the horizontal. What is its speed at the top of the trajectory?
a) Donnow.
b) Undetermined since you did not specify the launch velocity. correctchoice{}
c) Zero.
22. The gravitational acceleration is different on Earth and the Moon.
On Earth, g = 10 m/s2 . On the Moon, g is reduced. Assume you transport a 1 kg mass from Earth
to the Moon. What would happen to the mass? To the weight?
a) Mass changes, weight remains the same.
b) Mass remains the same, weight decreases.
c) Mass remains the same, weight increases.
d) Mass increases, weight increases.