# Science 9 : 4th quarter questions

## Quiz by Liz Go

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- Q1
A body moves in a plane with constant acceleration in a direction from the initial velocity. The path of the body will be

an ellipse

a straight line

an arc of a circle

a parabola

30s - Q2
If you throw a baseball straight up, what is its vertical velocity at the highest point?

0 m/s

9.8 m/s

0 m/s

^{2}-9.8 m/s

^{2}30s - Q3
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?

Changes continuously

Remains the same

Gradually decreasing

Gradually increasing

30s - Q4
What is its acceleration when a horizontal force equal to its weight is applied to an object on a frictionless surface?

acceleration due to surface

acceleration due to force

acceleration due to gravity

acceleration due to friction

30s - Q5
Two objects are released from the same height. Object A falls straight down from a cliff, and object B follows a curved parabolic path. Which of the statements is true?

Object A hits the ground first if it is heavier than Object B

Object A hits the ground before Object B

both Objects A and B will hit the ground at the same time

Object B hits the ground before Object A

30s - Q6
What factor(s) affect (s) how far a projectile will land?

both angle of launch and initial velocity

none of the choices

initial velocity only

angle of launch only

30s - Q7
Consider a plane moving with 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.

None of the choices

Directly below the plane

Behind the plane

In front of the plane

30s - Q8
A baseball player throws a ball horizontally ( at an angle of 0

^{0}). Which statements best describe the ball's motion after it is thrown? (Neglect air resistance)its vertical speed remains the same, and its horizontal speed remains the same

its vertical speed increases and its horizontal speed remains the same

its vertical speed increases, and its horizontal speed increases

its vertical speed increases and its horizontal speed decreases

30s - Q9
Which has more momentum, a heavy truck moving at 30 kph or a light truck moving at 30kph, or a light truck moving at 30 kph?

cannot be determined

both have the same momentum

a heavy truck

light truck

30s - Q10
Two billiard balls approach each other at equal speed. If they collide in a perfectly elastic collision, what would be their velocities after collision?

different in magnitude and opposite in direction

zero

same in magnitude but opposite in direction

same in magnitude and direction

30s - Q11
Which of the following statements describes momentum?

It is the product of the body's mass and velocity

It is the sum of body's mass and acceleration

It is the product of body's mass and acceleration

It is the sum of body's mass and velocity

30s - Q12
What word can best describe the total momentum in an isolated system?

converted

lost

changed

conserved

30s - Q13
What is the momentum of two cars after a collision if its momentum before the collision is 50 kg m/s?

15 kgm/s

50 kgm/s

5 kgm/s

30 kgm/s

30s - Q14
The total mechanical energy of the object at the highest point compared to its total mechanical energy at the lowest point is _______.

not related

greater

equal

lesser

30s - Q15
Mechanical energy is defined as the sum of both the potential energy and the kinetic energy of an object. According to the law of conservation of energy, what happens to mechanical energy if the potential energy of an object decreases?

Mechanical energy increases

Mechanical energy increases then decreases

Mechanical energy remains unchanged

Mechanical energy decreases

30s