Question 1

When you are riding in a car then the driver suddenly steps on the gas pedal, why do you feel a jolt and push back?

Accepted Answer

It is caused by inertia which states that the body at rest will remain at rest unless an external force is applied.

Answer

The sudden step of the driver on the gas pedal maintains the forces acting on your body.

Answer

The applied force of the car disturbs the inertia of the body at rest regardless of the mass. The greater the mass of the person, the greater the inertia.

Answer

The pushback is caused by the inertia of your body that experiences an applied force from the car.

Question 2

Study the picture below. Why does the action and reaction forces from nail and hammer do not cancel out?

Accepted Answer

Since the external forces act on different objects therefore the magnitude equals to zero.

Answer

The direction of the forces is opposite from each other.

Answer

The hammer and the nails are interacting, and they follow action-reaction with equal magnitude of forces.

Answer

Both the hammer and the nail receive unbalanced forces exerted by each other.

Question 3

Solve for the potential energy of a 2 kg suitcase that is raised from 2 m above the ground. (Hint: PE=mgh ;where g=9.8m/s² )

Accepted Answer

39.20 Joules is the stored energy of the object due to the virtue of gravity.

Answer

39.20 is the resulting product following the formula PE=mgh.

Answer

39.20 is the computed product and joule as the unit upon calculating the potential energy.

Answer

39.20 kg m/s² is the potential energy of the 2 kg suitcase that is raised in 2 m.

Question 4

Why does sound travel faster in warmer air?

Accepted Answer

Because the air molecules move faster if the temperature is higher.

Answer

Because the molecules of air are tightly packed.

Answer

Because the molecules are active in hot surroundings.

Answer

Because air molecules gain more kinetic energy and vibrate faster.

Question 5

How would you describe the type of fault as illustrated in the diagram below?

Accepted Answer

The hanging wall slides down relative to the footwall due to the sudden release of energy.

Answer

It has a resulting obtuse angle on the surface after the movement.

Answer

It is considered normal fault wherein one side of the fault moves downward with respect to the other side.

Answer

The illustration shows the compressional type of stress that occurred in the inner layers of the earth.

Question 6

Marikina City is along the West Valley Fault which is classified as an active fault. If there is a magnitude 5 earthquake, what would be its impact on humans and their properties?

Accepted Answer

Most people are frightened due to the strong vibrations of the ground.

Answer

Buildings may collapse due to strong intensity of the earthquake.

Answer

Many people feel dizzy and may find it difficult to stand on the upper floors.

Answer

Heavy objects and furniture overturn and topple.

Question 7

How is wind speed used to classify tropical cyclones?

Accepted Answer

If warm moist air flows into a preexisting atmospheric disturbance, further development occurs, and it will be classified as the next category which is more destructive.

Answer

To be able to develop as a tropical cyclone, it must sustain the wind speed and requires a continuous flow of warm moist air.

Answer

The classification of tropical cyclones depends on its sustained wind speed.

Answer

When winds sustain its speed up to 61 kilometers per hour, it causes heavy rainfall in the inland and classifies it as typhoon.

Question 8

Which infer the illustration below?

Accepted Answer

On September 16, 2018, typhoon Ompong is already outside the PAR because it is located 19.8°N, 115.7°E.

Answer

The typhoon Ompong lasts from September 13 to15, 2018 but did not affect much the country because it traversed the uppermost part of Luzon.

Answer

Typhoon Ompong enters the PAR at 8 AM on September13, 2018, stays for three days, and moves in westward direction.

Answer

The typhoon Ompong enters the Philippine Area of Responsibility on September 13, 2018, at 8AM.

Question 9

Which characteristic is common among comets, meteoroids, and asteroids?

Accepted Answer

They are not usually seen in the sky because they do not follow a specific orbit.

Answer

They have the same chemical composition because comets and meteoroids are remnants of asteroids.

Answer

They vary in size and the meteoroids are the smallest.

Answer

They come in varied sizes, shapes, and compositions.

Question 10

Which statement is TRUE?

Accepted Answer

When meteoroid enters Earth’s atmosphere the air in front of it hits up causing materials to burn up

Answer

A meteoroid can be made of oxygen.

Answer

A meteoroid can be a small as a grain of sand or as big as a boulder.

Answer

A meteoroid never leave the asteroid belt.

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