# Physics 101 Exam 1

42 Questions  I  By Qtkhmerqueen143
Final exam

Changes are done, please start the quiz.

 1 Science is a body of knowledge that
 A. Condenses knowledge into testable laws
 B. Describes order in nature
 C. Is an ongoing activity of humans
 D. All of the above choices are correct
 E. None of the above choices are correct
 2 As an object freely falls downward, its
 A. Acceleration increases
 B. Velocity increases
 C. Both of these
 D. None of these
 3 A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that
 A. The milk carton has inertia
 B. The milk carton has no acceleration
 C. There is an action-reaction pair of forces
 D. Gravity tends to hold the milk carton secure
 E. None of these
 4 The gain in speed each second for a freely-falling object is about
 A. 0
 B. 20 m/s
 C. 5 m/s
 D. 10 m/s
 E. Depends on the initial speed
 5 A package falls of a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is
 A. More than 30 m/s
 B. Zero
 C. Less than 30 m/s but larger than zero
 6 According to Newton's law of inertia, a rail road train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains.
 A. Are much too heavy
 B. Move too slowly
 C. Must go up and down hills
 D. Always have forces that oppose their motion
 7 A scientific statement that can never be changed is a scientific
 A. Principle
 B. Theory
 C. Hypothesis
 D. Law
 E. None of the above choices are correct
 8 If no external forces are acting on a moving object it will
 A. Continue moving at the same velocity
 B. Move slower and slower until it finally stops
 C. Continue moving at the same speed
 9 Galileo's use of inclined planes allowed him to effectively
 A. Eliminate the acceleration of free fall
 B. Increase the acceleration beyond that of free fall
 C. Slow down the acceleration of free fall
 D. Eliminate friction
 10 The two measurements necessary for calculating average speed are
 A. Distance and acceleration
 B. Velocity and distance
 C. Acceleration and time
 D. Velocity and time
 E. Distance and time
 11 A horse gallops a distance of 10 kilometers in a time of 30 minutes. It's average speed is
 A. 15 km/h
 B. 30 km/h
 C. 20 km/h
 D. 40 km/h
 12 A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval it acceleration is
 A. Zero
 B. 1000 km/hr
 C. 110 km/hr
 D. 10 km/hr
 13 A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected the force required to keep the puck sliding at constant velocity is
 A. Equal to its weight divided by its mass
 B. Zero
 C. Equal to the product of its mass times its weight
 D. Equal to its weight
 14 Twelve seconds after starting from rest, an object falling freely will have a speed of
 A. 50 m/s
 B. 100 m/s
 C. 10 m/s
 D. More than 100 m/s
 15 If an object moves with constant acceleration, its velocity must
 A. Be constant also
 B. Change by the same amount each second
 C. Always decrease
 D. Change b varying amounts depending on its speed
 16 A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always
 A. Opposite its velocity
 B. Directed downward
 C. In the direction of motion
 D. Directed upward
 17 If a car accelerates form rest at 2 meters per second per second, its speed 3 seconds later will be about
 A. 2 m/s
 B. 6 m/s
 C. 4 m/s
 D. 3 m/s
 18 At on instant an object in free fall is moving downward at 50 meters per second. One second later is speed should be about
 A. 25 m/s
 B. 100 m/s
 C. 55 m/s
 D. 60 m/s
 E. 50 m/s
 19 Starting from rest, the distance a freely-falling object will fall in 1.0 second is about
 A. 10 m
 B. 2.00 m
 C. 5.0 m
 D. None of the above
 20 An object falls freely from rest on a planet where the acceleration due to gravity is 20 meters per second squared. After 5 seconds, the object will have a speed of
 A. 20 m/s
 B. 10 m/s
 C. 50 m/s
 D. 5 m/s
 E. 100 m/s
 21 If you drop an object, it will accelerate downward at a rate of 9.8 meters per second per second. If you instead throw it downwards, its acceleration (in the absence of air resistance and after it leaves your hand) will be
 A. Greater than 9.8 meters per second per second
 B. Less than 9.8 meters per second per second
 C. 9.8 meters per second per second
 22 If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about
 A. 2 seconds
 B. 20 seconds
 C. 10 seconds
 D. 1 second
 E. Not enough information to estimate
 23 When a rock thrown straight upwards gets tot he exact top of its path, its
 A. Velocity is zero and its acceleration is zero
 B. Velocity is about 10 m/s and its acceleration is zero
 C. Velocity is zero and its acceleration is about 10 meters per second per second
 D. Velocity is about 10 m/s and its acceleration is about 10 meters per second per second
 E. None of these
 24 A ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 10 seconds?
 25 Which has a greater mass?
 A. An automobile battery
 B. A king-size pillow
 C. Neither- both have the same
 26 Strange as it may seem, it is just as hard to accelerate a car on a level surface on the oon as it is here on the Earth. This is because
 A. The weight of the car is independent of gravity
 B. The mass of the car is independent of gravity
 C. Nonsense! a car is much more easily accelerated on the moon than on the Earth
 27 The newton is a unit of
 A. Force
 B. Inertia
 C. Density
 D. Mass
 28 A rock weighs 30 N on Earth. A second rock weighs 30 N on the moon. Which of the two rocks has the greater mass? (gravity on the moon is one-sixth of that on Earth)
 A. The one on the moon
 B. The one on Earth
 C. They have the same mass
 D. Not enough information to say
 29 A 10-kg brick and 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick is
 A. Zero
 B. The same as the force on the 1-kg book
 C. One-tenth as much
 D. 10 times as much
 30 The force of friction on a sliding object is 10 newtons. The applied force needed to maintain a constant velocity is
 A. Less than 10 N
 B. More than 10 N
 C. 10 N
 31 Whenever the net force on an object is zero, its acceleration
 A. Is zero
 B. May be less than zero
 C. May be more than zero
 32 A 1-kg mass at the earth's surface weighs
 A. 1 N
 B. 4.9 N
 C. 10.8 N
 D. 9.8 N
 E. None of these
 33 A 10-N falling object encounters 4 N of air resistance. The net force on the object is
 A. 4 N
 B. 10 N
 C. 6 N
 D. 0 N
 E. None of these
 34 An object is propelled along a straight-line path by a force. If the net force were doubled, the object's acceleration would be
 A. Four times as much
 B. Half as much
 C. Twice as much
 D. The same
 E. None of these
 35 An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration
 A. Halves
 B. Doubles
 D. Stays the same
 E. None of these
 36 Hang from a pair of gym rings and the upward support forces of the rings will always
 A. Each be equal to your weight
 C. Each be half your weight
 37 A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car?
 A. 1500 kg
 B. 500 kg
 C. 1000 kg
 D. 3000 kg
 E. None of these
 38 An object following a straight-line path at constant speed
 A. Has zero acceleration
 B. Has a net force acting upon it in the direction of motion
 C. Has no forces acting on it
 D. None of these
 39 Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction from the first force. The particle with both forces acting on it
 A. Theoretically tends to accelerate toward the speed of light
 B. Decelerates gradually to a halt
 C. Is brought to a rapid halt
 D. Continues at the speed it had when it encountered the second force
 E. None of these
 40 The brakes of a speeding truck are slammed on and it skids to a stop. If the truck were heavily loaded so that it had twice the total mass, the skidding distance would be
 A. 4 times as far
 B. 2 times as far
 C. 1/2 as far
 D. 1 1/2 times as far
 E. The same
 41 If you are driving at 20 m/s and slam on your brakes and skid at 0.5 g (5m/s/s) to a full stop, the skidding time in seconds is