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PHY 102 MOD 4 Exam
- Which of the following activities best illustrates the practices of the scientific method? a. Deciding on the materials necessary to build a terrarium.
b. Following the instructions to construct an electric generator.
c. Measuring the time for an object to fall from different heights.
d. Designing an electric circuit for a radio.
- What cannot be the outcome of a science experiment? a. A theory is supported.
b. A theory is disproven.
c. A theory is proven.
d. A theory is further refined.
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- A truck makes a sharp turn and a box falls out of the truck bed. This is best explained using:
a. the law of inertia.
b. Newton’s second law of motion.
c. the law of action and reaction.
d. Newton’s third law of motion.
- If an object increases its speed by the same amount each second, its acceleration: a. also increases each second.
b. is constant.
c. decreases each second.
d. can either increase or decrease depending on the circumstances
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- The acceleration of an object is caused by: a. a change in speed.
b. a change in velocity.
c. a change in direction.
d. an unbalanced force.
- Which of the following describes an accelerated motion? a. Driving uphill at a constant speed.
b. Driving downhill at a constant speed.
c. Driving around a circle at a constant speed.
d. Driving on a straight road at a constant speed.
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- A ball is placed at the top of a hill and then released. After 5 seconds it has a speed of 20 m/s. What is the average acceleration of the ball? a. 10 m/s^2
b. 0 m/s^2
c. 100 m
d. 5 m/s^2
e. 4 m/s^2
- A circus performer with a weight of 700 N hangs from the middle of a bar supported by a vertical rope at each end. What is the tension force in each rope? a. 700 N
b. 1400 N
c. 350 N
d. 1050 N
e. 0 N
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- A 12 kg box is pulled across the floor with a 48 N horizontal force. If the force of friction is 12 N, what is the acceleration of the box? a. 3 m/s
b. 5 m/s
c. 10 m/s
d. 1 m/s
e. 4 m/s
- A satellite orbits the earth in a circle with constant speed. Which of the following is true? a. The net force on the satellite is zero because the satellite is not accelerating.
b. The net force on the satellite is directed forward, in the direction of travel.
c. The net force on the satellite is directed straight down, toward the Earth.
d. The net force on the satellite is directed outward,
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away from the Earth.
- Power is: a. the same as energy.
b. the same as work.
c. the rate at which a force is applied.
d. the rate at which work is done.
- What is the purpose of airbags in modern cars? a. They alert the police that a collision happened.
b. They decrease the time of impact in a collision.
c. They protect the car from being damaged during a collision.
d. They decrease the force of impact on the driver and the passengers during the collision.
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d. When the basketball is thrown high into the air.
- A 3 kg cart moving with a speed of 4 m/s collides with a 1 kg cart at rest. If the carts stick together after the collision, with what speed will they move after the collision? a. 3 m/s
b. 4 m/s
c. 2 m/s
d. 1 m/s
- A 50 kg man is stepping to the right out of a 20 kg boat that has not yet been tied to the dock. He is thinking he will step onto the dock. What is most likely to happen?
a. The man will move a small distance to the right and the boat will move a larger distance to the left.
b. The man will move to the right while the boat will stay in place.
c. The boat will move to the left while the man will stay in place.
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d. The boat will move the same distance to the left as the man will move to the right.
e. The boat will move a small distance to the left and the man will move a larger distance to the right.
- When we say an appliance uses up energy, which of the following actually happens? a. Electrons are removed from the circuit and placed elsewhere.
b. Kinetic energy of the electrons is converted to heat and other forms of energy.
c. Electric charges are used and will disappear as a result.
d. The voltage of the outlet is lowered. e. Electric current is disappearing in the circuit.
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a. The atoms in the wood vibrate faster than the atoms in the metal.
b. Wood, in general, is not a good insulator.
c. Metals, in general, are good heat conductors.
d. Metals, in general, have higher heat capacities than wood.
e. Metals are just colder than wood when left in the same environment.
- When a comb is charged negatively by running it through your hair, the hair is a. neutral.
b. charged negatively, too.
c. charged positively.
d. grounded.
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- Consider a 50W light bulb and a 100W light bulb connected to a household outlet. Which of the following statements is true? a. The 50W light bulb has more current and less resistance.
b. The 100W light bulb has more current and less resistance.
c. The 50W light bulb has more current and higher resistance.
d. The 100W light bulb has more current and higher resistance.
- What is the basic purpose of a generator? a. To convert electrical energy to mechanical energy.
b. To convert electrical energy to thermal energy.
c. To convert thermal energy to mechanical energy.
d. To convert mechanical energy to electrical energy.
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a. greater
b. smaller
c. the same
d. sometimes less and sometimes more
- The purpose of a fuse or a circuit breaker is: a. to limit the amount of current in a circuit.
b. to increase the amount of current in a circuit.
c. to limit the amount of voltage in a circuit.
d. to measure the amount of current and voltage in a circuit. e.
