Energy Basics

1) Temperature is the same thing as heat.

True    False

2) Force is a form of energy.

True    False

3) When touching an object, the sensation of hot and cold is a measure of object's overall temperature.

True    False

4) Running a ceiling fan in an enclosed room during the summer will slowly raise the room’s temperature (assuming no heat transfer in or out).

True    False

5) When a person uses a simple machine, such as a lever or a pulley, the work or energy output from the simple machine can never be higher than the work or energy input by the person using the simple machine (neglect any potential energy that may have been previously stored in the machine).

True    False

6) If there were no energy losses due to friction or unwanted heat transfer, an internal combustion engine could be built for an automobile which would be capable of converting 100% of the combustion energy in gasoline into energy used for moving the car. (Assume 100% of the fuel is burned during combustion.)

True    False

7) To produce heat, the Sun burns hydrogen in a combustion reaction.

True    False

8) Energy is the ability to do work. In other words, if Ben needed 1000 joules of energy to move a box 5 meters across the floor it would make no difference whether he had 1000 joules of thermal energy or the same amount of mechanical energy. He could still do the work required to get the job done.

True    False

Gravity

9) If a feather and hammer are dropped on the Moon at the same time from the same height they will hit the Moon’s surface at virtually the same time.

True    False

10) The Moon has no gravity.

True    False

11) Mass and weight have essentially the same meaning. To increase the weight of an object requires an increase in the mass of the object.

True    False

12) Susan jumps off a chair. As she is falling, the Earth’s gravitational force on her is higher than her gravitational force on the Earth.

True    False

13) An astronaut orbits the Earth 500 miles above its surface. She appears to be weightless because there is virtually no gravitational force on her.

True    False

14) When a person on Earth stands on a floor, of the two external forces acting on her, her perception or sensation of weight directly depends on the upward force the floor exerts on her feet, not the downward force of gravity.

True    False

Basic Kinematics

15) When an object has negative acceleration, the object has to be slowing down.

True    False

16) Juan drives around a corner at constant speed. His car accelerates.

True    False

17) Shanda drives around a circular track exactly 12 times in 2 hours. Her speedometer constantly reads exactly 15 miles per hour during this time. Her average velocity is zero for the trip.

True    False

The Nature of Fluids and Pressure

18) The force between your feet and the floor is greater while standing on your tiptoes than while standing flat on your feet.

True    False

19) The pressure at the bottom of a 10-meter-deep, 20-kilometer-wide lake is higher than the pressure at the bottom of a 10-meter-deep well which is only 1 meter across. (Assume all things are equal except the parameters mentioned.)

True    False

20) If an object is placed in water and sinks, it is because it has no buoyancy force acting on it.

True    False

Newton’s Laws

21) An insect flying through the air smacks into the windshield of a rapidly-moving train. The force the windshield exerts on the insect is higher than the force the insect exerts on the windshield.

True    False

22) Susan throws a ball in the air. After the ball leaves her hand, the ball accelerates in the upward direction as it is moving upward and accelerates in the downward direction as it is moving downward.

True    False

23) Friction provides the force which "pushes" a car forward as it accelerates down the road. (Assume a flat road.)

True    False

24) If a car hits a tree, the car’s occupants (assume no seat belts or air bags) will be violently thrown forward at the time of the accident due to a force created by the car seats.

True    False

25) A table resting on the floor pushes downward on the floor. The floor likewise pushes upward on the table.

True    False

26) Ben travels to a distant planet. In outerspace, with essentially no gravity, he can throw a baseball (mass = 0.5 kg) and a shot put (mass = 4 kg) at the same speed with no discernable difference in effort.

True    False

The Nature of Matter

27) 1000 liters of water is more dense than 10 liters of water. (Ignore the container. Assume water is incompressible and all conditions are equal except the ones stated.)

True    False

28) Iron can exist as a gas.

True    False

29) A cloud's mass consists primarily of water vapor.

True    False

30) An atom is just like a tiny solar system in which the nucleus is like the Sun and electrons are like tiny planets orbiting the nucleus in elliptical paths.

True    False

31) Under typical conditions, ice melts and water freezes at the same temperature.

True    False

32) A solid object like a rock is almost entirely filled with empty space and only feels solid due to electrical repulsion forces.

True    False

Electricity

33) If lightning strikes a car, the people inside it will most likely be electrocuted, assuming that the car’s tires are wet from rain and hence do not act as insulators.

True    False

34) Voltage is the force which pushes electrons through wires.

True    False

35) Jane reads that passing a current of 100 milliamps through a person’s body from one hand to the other can be fatal. She accidentally grabs the positive terminal of her car’s battery in one hand and the negative in the other. Her car has a 12-volt battery rated for 100 amps. Jane would most likely be electrocuted by her careless action.

True    False

36) A light bulb is connected with a battery to form a simple circuit. A stream of electrons flows through the light bulb from the positive terminal of the battery to the negative terminal.

True    False

Units

37) There are 100 cubic centimeters in a cubic meter.

True    False

38) A milliliter is exactly the same size as a cubic centimeter.

True    False

39) Two 90-decibel sound sources are turned on at the same time. Together they create a 180-decibel sound level.

True    False

40) A mole of helium gas has exactly the same number of atoms as a mole of lead.

True    False