Please mark the correct answer for each question on the bubble sheet. Fill in the dot completely with a #2 pencil.

Problem 1 :

You are riding your bicycle fast on a level road. A deer crosses in front of you and you slam on the brakes, locking your wheels so that you skid to a stop. During this skidding stop, the kinetic energy you had while you were moving forward

Problem 2 :

When you drop a bouncy ball on a concrete floor, it bounces for a long time because it has difficulty getting rid of which conserved quantity?

Problem 3 :

For tomorrow's scuba diving trip, you pick up a full tank of air at the dive shop. You leave the tank in the hot sun and its temperature increases substantially. As a result of this temperature increase,

Problem 4 :

To save space, you hang some shelves from the back of your door and fill them with objects. Neglecting friction or air resistance, these objects make it harder

Problem 5 :

You take your eyes off the road to read a text message on your cell phone and drive into a car stopped at the intersection. Neither car has its brakes on, so both cars coast into the intersection after the collision. The total momentum of the two cars after the collision is

Problem 6 :

As you fill your hanging birdfeeder with seed, you notice that its supports bend downward slightly. When you add 1 pound of seed, it bends downward 1 inch. When you add 1 more pound of seed, it bends downward a total of

Problem 7 :

A toy helium balloon is full when it arrives, but deflates steadily over the next several days. This deflation occurs because the number of helium atoms in the balloon

Problem 8 :

You are standing on the tip of a pointed fence post, trying not to fall off. Each time you start to tip, some wild arm motions return you to your precarious position. Your upright position on the post is

Problem 9 :

You are at the county fair and are trying to knock over a stack of heavy blocks by throwing something at it. You have a choice of various 1 kilogram projectiles, which you can throw at 80 kilometers/hour. To have the best chance of knocking the stack over, you should chose the projectile that

Problem 10 :

If you hold a properly filled glass bottle of soda or beer upright in your hand and strike the cap hard with a rubber mallet, the

Problem 11 :

A child is riding in a wagon tied to the family dog with a string. As the dog walks steadily forward on the level sidewalk, the wagon follows perfectly. Suddenly the dog leaps forward to chase a squirrel and the string snaps. The loaded wagon breaks the string because the loaded wagon has such a large

Problem 12 :

Many high-rise buildings have water tanks on their roofs. Water stored in such a tank ensures good water pressure throughout the building because it has more than enough

Problem 13 :

The silvery Mylar bags used for long-lasting helium balloons barely stretch at all. Once you have filled such a balloon to the point where it is taut, it becomes counterproductive to add any more helium atoms. If you add more helium to a taut Mylar balloon, its weight will

Problem 14 :

The tumble dryer in the laundry room spins its drum about a horizontal axis. The clothes in this drum rise part way up the side of the drum as it turns and then fall back toward the bottom of the drum, over and over again. If the drum turned too fast, this tumbling effect wouldn't work because the

Problem 15 :

At equilibrium, the surface of a lake is smooth and level. That's because bumps or dips in the water's surface would

Problem 16 :

You are living in an old house with aged plumbing. The pressure in the water main outside the house is good and steady, but the shower spray is surprisingly weak. And when other people are running water at the same time, the shower barely sprays at all. The reason that the shower spray is so weak while other people are running water is that

Problem 17 :

You have just added sugar to your coffee and are about to mix the two together with 10 swirls of a teaspoon. If you move the spoon very slowly during these swirls, it won't be nearly as effective as if you move the spoon fast. Rapid motion is important because you want the coffee to experience

Problem 18 :

During the spin-dry cycle, the drum of a standard, top-loading washing machine spins rapidly about a vertical axis and flings water out of the wet clothes. This water flows out of the spinning drum through holes and goes into the air. Ignoring gravity, this water then travels at constant

Problem 19 :

When a skater pulls in her arms while spinning on the tip of her skate, she begins spinning faster. That's because pulling in her arms decreases her

Problem 20 :

You are building a decorative mobile and the first thing you do is hang a long stiff rod from a string attached to the ceiling. When you have properly centered the string on the rod, the rod experiences zero torque about its center of mass. With zero net torque acting on it, the rod

Problem 21 :

You have joined the rodeo and are in the midst of riding an angry bull. Amazingly enough, you remain in the saddle as the bull leaps up and down, and you feel alternately very heavy and very light. You feel heaviest when the bull is

Problem 22 :

You and a friend are having a tug-of-war: you are pulling on opposite ends of a rope, each trying to pull the other one into a mud puddle that lies between you. You successfully pull your friend into the puddle and win. In doing so, you do

Problem 23 :

You are rearranging the furniture and are moving your desk to the other side of the room. To keep your desk sliding across the level floor at constant velocity, you have to keep pushing it forward. The net force on the desk is

Problem 24 :

You're watching a decorative fountain spray water straight up. As the water rises from its source, the water's velocity is

Problem 25 :

You are lying motionless in a hammock at its equilibrium point when a friend gives you a strong push sideways. Now you are swinging back and forth about that equilibrium. As you swing, your acceleration is greatest when you

Problem 26 :

A rubber bouncy ball won't bounce on loose sand, but a beach ball will. The difference is that only the

Problem 27 :

A rocking chair recovers automatically from any tip. When it is upright, the chair is clearly in a stable equilibrium. As you tip this chair away from this equilibrium, you can be sure that its center of gravity

Problem 28 :

You're riding in a horse-drawn carriage in New York City . As each of the cart's wheels turns against the pavement without slipping, the ground exerts a static frictional force on that wheel. This frictional force does

Problem 29 :

You are stocking shelves in the grocery store. You can lift 12 containers of milk onto a high shelf either all together or one at a time. If you lift them all together, the work you do in raising them onto the shelf will be

Problem 30 :

Your shampoo bottle is almost empty, so you tighten its cap and swing it rapidly in a circle with its cap end pointing outward. The remaining shampoo collects just inside the cap and you are able to squeeze out one more dollop. This technique works because

Problem 31 :

You have just leapt off the high diving board and are falling. Neglecting any effects due to air, which of the following quantities can't change while you are above the water?

Problem 32 :

You kick a stationary soccer ball and it flies off into the distance. At the moment the ball stops touching your foot, it is traveling

Problem 33 :

A 4-story apartment building is fed by a single water pipe that runs up one corner of the building. The pipe has a constant diameter all the way up. As water rises in this pipe toward the upper floors,

Problem 34 :

An arrow is heading toward its target after leaving the archer's bow. Neglecting any effects due to air, the net force on the arrow

Problem 35 :

A log floats motionless at the surface of a still lake. The log's weight is exactly equal to the weight of

Problem 36 :

Your friend is wearing roller-skates on a bus that is stopped at a traffic light. The light turns green. He is standing motionless in the aisle as the bus starts forward and he finds himself moving rapidly toward the back of the bus. He is heading toward the back of the bus because

Problem 37 :

You roll a ball directly up a ramp. It travels up the ramp, comes to a stop, and rolls back to its starting point. Neglecting friction or air resistance, the ball accelerates

Problem 38 :

Your friend is running in a long race and you are watching from the sidewalk. To encourage her as she runs swiftly past you, you reach out and pat her on the back. During that pat, you push her forward with a force of 10 newtons (about 2 pounds). She pushes back on you with a force of

Problem 39 :

Two identical balls roll off a horizontal desk at exactly the same moment. One ball is traveling horizontally twice as fast as the other at the moment the two leave the desk. Compared to the slower ball, the faster ball hits the ground

Problem 40 :

You are pounding nails into the floor with a steel hammer. To reduce the noise, you wrap a thick layer of rubber around the hammer. Although you swing the hammer at just the same speed as before, it's unable to push the nails into the wood. That's because the wrapped hammer transfers