physics rev 6.2 Flashcards
(16 cards)
For instance, a small and big car collided. After their collision, given that they experience the same acceleration, which of them experience greater amount of force?
a. Small car
b. Big car
c. Both cars
d. None
EXPLANATION: With the formula at hand, F=ma, it can be elucidated that the car with higher mass will experience greater force if its acceleration is equal to the small car.
ANSWER: B
Inside a train in LRT 1, passengers who are not holding onto the railings usually move forward or lose their balance when the train suddenly stops. Which Newton’s Law explains why passengers try to remain in place?
a. Inertia
b. Acceleration
c. Deceleration
d. Interaction
EXPLANATION: Always take note that the first law explains that an object has a tendency to maintain its state of rest in uniform velocity in a straight line.
ANSWER: A
Which scenario depicts that there is a work done on the object?
a. Mike pushes a wall, but it doesn’t move
b. Cholo carry two bags in your hands and are not
moving
c. Cherry sits on a chair for hours
d. Joshua pulls the door as he go in the classroom
EXPLANATION: A work is done on an object when the force applied and the displacement have the same direction. In this case, all of the choices except D implies that there is no work done. When Joshua pulled the table towards himself, both the force and the door is also directed to him.
ANSWER: D
Consider that Vehicle A is traveling at 100 kph with a mass of 10,000 kg. Meanwhile, Vehicle B is traveling at 10kph with the same mass to Vehicle A. Which of them experiences greater momentum?
a. Vehicle A
b. Vehicle B
c. Both Vehicles
d. No momentum exhibited
EXPLANATION: Keep in mind that a fast-moving vehicle has more momentum than a slow-moving vehicle even of the same mass.
ANSWER: A
Object A and Object B collided together and they both stick together and travelled in one direction. What is the type of collision and is KE conserved?
a. Elastic Collision; KE is conserved
b. Elastic Collision; KE is not conserved
c. Perfectly Inelastic Collision; KE is conserved
d. Perfectly Inelastic Collision; KE is not conserved
EXPLANATION: Remember the clue term, which is stick. It means that the two objects exhibit a perfectly inelastic collision. In this case, the KE is always not conserved.
ANSWER: D
In increasing the volume of the music or sounds we listen to, we aim at increasing which part of a sound wave?
a. Amplitude b. Frequency c. Wavelength d. Period
EXPLANATION: To increase the volume of sounds, we have to increase the amplitude of the sound wave. Thus, we use amplifiers to increase the loudness of sound.
ANSWER: A
Choose the best among the following scenarios that exhibit a longitudinal wave.
a. Cindy is texting her mom to pick her up
b. Ryann is listening to his favorite music
c. Jacob is heating his food in the microwave
d. Ace is reading a manga during his free time
EXPLANATION: A transverse wave is observed in electromagnetic waves; meanwhile, longitudinal waves are exhibited by sound waves. In this case, the scenario that depicts longitudinal waves or uses sound waves is Ryann.
ANSWER: B
Which of the following EM waves is applied in medicine for targeting tumors and treating cancer to deliver a large dose of radiation and kill cancer cells?
a. Infrared rays
b. Ultraviolet rays
c. Xrays
d. Gamma rays
EXPLANATION: Gamma rays have the shortest wavelength and highest energy. In fact, they can penetrate deep into the body; hence, they are used for cancer treatment.
ANSWER: D
In electricity, what is the force that pushes the electric current to travel continuously in a conductor? What inhibits its flow?
a. Current; Resistance
b. Voltage; Current
c. Voltage; Resistance
d. Resistance; Current
a. Current; Resistance
b. Voltage; Current
c. Voltage; Resistance
d. Resistance; Current
EXPLANATION: Voltage is the force that pushes the electric current, while resistance inhibits its flow.
ANSWER: C
Which of the circuits has the lowest and highest total resistance?
a. Series: R1 = 5; R2 = 3; R3 = 8; R4 = 1; R5 = 2
b. Parallel: R1 = 5; R2 = 3; R3 = 8; R4 = 1; R5 = 2
c. Series: R1 = 5; R2 = 4; R3 = 3; R4 = 7; R5 = 2
d. Parallel: R1 = 5; R2 = 4; R3 = 3; R4 = 7; R5 = 2
EXPLANATION: Keep in mind that the total resistance for a series circuit is just the summation of the resistors, while in a parallel circuit, it is the reciprocal of the summation of the reciprocal of each resistor.
ANSWER: Highest (C) & Lowest (B)
Airplanes utilize low-velocity air flow, which has a relatively higher pressure as compared to the high-velocity airflow. This concept explains why airplanes are capable of air flight.
a. Torricelli’s law
b. Pascal’s law
c. Bernoulli’s principle d. Dalton’s law
EXPLANATION: The image by a convex mirror is independent of object position. It always appears erect and behind the mirror (virtual). Thus, the nature of the image formed by the convex mirror is virtual, erect, and diminished.
ANSWER: C
It is a type of heat transfer exhibited by both boiling water and the earth’s mantle layer. This is where hot rises and cold sinks.
a. Conduction b. Convection c. Radiation d. Induction
EXPLANATION: Convection is the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat
ANSWER: B
Judy combines two materials with water in her laboratory. She noticed that Solid Particle A, even though they are solid, started floating. On the other hand, Solid Particle B started sinking. Arrange the materials according to ascending density
a. Solid B < water < Solid A
b. water < Solid A < Solid B
c. Solid A < water < Solid B
d. Solid A < Solid B < water
EXPLANATION: Notice that Solid A floats on water, this implies that Solid A is less dense than the water. On the other hand, Solid B sinks signifying that it has higher density than the water.
ANSWER: C
Is the geographic north pole similar with magnetic north pole? Likewise, which of them is pointed by a magnetic compass?
a. Yes; geographic north pole
b. No; geographic north pole
c. Yes; magnetic north pole
d. No; magnetic north pole
EXPLANATION: A magnetic compass points to the earth’s magnetic poles, which arenot the same as earth’s geographicpoles. Geographicpolesarefixedandisknown as the true poles of the earth. Meanwhile, magnetic poles may sometimes switch from time to time, known as magnetic reversal.
ANSWER: D
Which material has the highest refractive index?
a. Air
b. Water
c. Diamond
d. Ice
EXPLANATION: Diamond has the highest refractive index due to its high density aside from being solid unlike the other options. Similarly, it greatly slows the speed of light, leading to a higher refractive index.
ANSWER: C
