SCIENCE 9 Q4

At what axis in the cartesian coordinate system is horizontal motion usually associated?

x-axis

If a stone is horizontally launched at a certain height, how do you describe the magnitude of its vertical velocity as it approaches the ground?

Gradually Increasing

A stone is just released from the window of a train moving along a horizontal straight track. The stone will the ground following:

Parabolic Path

A sepak takraw is kicked from a height of two meters follow a path that is ______.

Parabolic

Which of the ff. statements BEST shows horizontal motion?

Running in a 100-yard dash

Vertical motion is a type of motion that is affected by gravity. which of the ff. satisfies an object moving in vertical motion?

fruit falling from a tree

What is referred to as an object that is given by an initial velocity and is then acted solely upon by gravitational force?

Projectile

A bomb is dropped from an airplane moving horizontally at a constant speed. When air resistance is taken into consideration, the bomb _______.

falls to earth behind the plane

Which of the ff. composed the two linear motions of a projectile?

horizontal and vertical motion

A projectile is launched at an angle of 300 degrees above the horizontal. Neglecting air resistance, what are the projectile’s horizontal and vertical acceleration when it reaches its maximum height?

The horizontal acceleration is zero and the vertical acceleration is -9.81 m/s2

If you throw a baseball straight up, what will its vertical velocity be at the highest point?

0m/s

What happens to the horizontal velocity of an object as it travels through the air?

Remains the same

What is commonly used as refrigerant for most refrigirators?

gas that is easy to liquefy

The product of force and distance

work

Our electrical energy usage consumption is measured in

kilowatt-hour

The rate of doing work

power

Power generated from power stations is measured in

megawatt

The capacity to do work

energy

Which of these is quantity of matter in an object?

mass

What do you call the path followed by an object under projectile motion?

trajectory

What is impulse?

the change in momentum of an object

A ball is thrown at an angle of 380 with respect to the horizontal. What happens to the magnitude of the ball’s vertical velocity during the time interval that the ball is in the air?

it decreases, then increases

What is the impulse of an object moving with constant momentum?

0

Which of the ff. is true?

The principle of the conservation of mechanical energy states that the total mechanical energy in a system remains constant as long as the only forces acting are conservative force.

Which best describes potential energy?

stored energy

What factors affecting how far a projectile will land?

both angle and initial velocity

Consider a plane moving with a constant speed at an elevated height above the Earth’s surface. During its flight, the plane drops a package from its luggage compartment. Where will the luggage land with respect to the plane?

directly below the plane

Which example best represents kinetic energy?

a flying kite

A car collided with a bus that has greater mass and velocity. Which of these best describe the change of the momentum of the bus and the car?

the change of momentum of the bus is greater than the car

Which illustrates the direct transformation of potential to kinetic energy?

Kathy’s arrow is released from its bow

How do air bags help protect a driver or passenger in a car accident?

they reduce the force of impact by increasing the time of impact

A mini dump truck full of abaca fiber collides with a motorcycle or habal-habal. The velocity of the truck and motorcycle is the same. Which has a greater impulse and why?

The mini dump truck bc it has larger change in momentum

A stand hold two balls, A and B. At the same instant, ball A is dropped straight down, and ball B is shot straight out. Which ball will hit the ground first? (neglect air resistance)

both balls will reach the ground at the same time

2 marbles of equal mass are rolling towards each other. One is rolling at 7m/s and the other at 10m/s. The one rolling faster has ______ momentum and _____ impulse. It wll surely knock the other one backwards.

greater, greater

Which of the ff. describes momentum?

mass times its velocity

What is the energy of a motorcycle moving down the hill?

entirely kinetic

The initial velocity of Manuel playing luksong tinik has horizontal and vertical components that are equal in magnitude. What angle does his velocity make with the horizontal?

45

It is a form of energy that flows from a region of high temperature to a region to low temperature.

heat

Shane turned on a lamp switch in her room. Which is the correct path of electronical power that can be traced back to the source?

Power plant-transmission substation-distribution substation-residence

How does water from the deep well move upward?

it uses water heat pump

What is the function of heat engine?

converts thermal energy to mechanical energy

Why is heat not 100% efficient?

bc engines needs to be cooled down

What happens to the vertical velocity of an object as it travels through the air?

changes continuously

Which of the ff. would describe the momentum?

p=mv

What is the energy of a motorcycle going fast midway down a hill?

both kinetic and potential

Which of the ff. about conservation of momentum is NOT correct?

momentum is not conserved when two or more interacting objects in a head on conclusion

How can you increase the momentum of an object?

by increasing its mass or velocity

A Batang Pinoy athlete from your school throws a javelin, always at the same speed, at four different angles (30, 40, 60 ,and 80) above the horizontal. Which two throws cause the javelin to land the same distance?

30 and 60

What force enables objects to fall on to the ground?

Gravitational Force