Science 9 - Fourth Quarter Assessment

What is the momentum of the two cars after collision if its momentum before collision is 50 kg/s?

• A) 50 kg/s for each car

• B) 0 kg/s for one car and 50 kg/s for the other car

• C) 100 kg/s for one car and 0 kg/s for the other car

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

• One billiard ball will come to a stop, while the other will continue moving with the same speed and direction.

• Both billiard balls will rebound off each other at the same angle with the same speed.

• 
  

  Both billiard balls will come to a complete stop after the collision.

Which of the following is an example of work being converted into heat?

• Heat engine

• Hand rubbing

• Gas stove

• Hot air balloon

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

• A. Hyperbolic path

• B. Circular path

• C. Straight path

• D. Parabolic path

When the work is done upon the object, that object gains energy. What type of energy is acquired by the objects upon which work is done?

• Electrical energy

• Heat energy

• Mechanical energy

• Work energy

Which of the following scenarios involves an object undergoing projectile motion?

• A. A ball thrown through the air.

• B. A swimmer pushing off from the wall

• C. A runner moving forward in a straight line

• D. A volleyball being spiked straight down

Which of the following happens to the energy of a coconut that falls freely?

• Loses potential and gains kinetic energy

• Loses both potential and kinetic energy

• Gains potential and loses kinetic energy

• Gains both potential and kinetic energy

At which point in the pendulum’s motion where the kinetic energy is at its maximum?

• e

• c

• d

• b

When you drop an object, it falls towards the ground. What force is responsible for this?

• A. Frictional Force

• B. Gravitational Force

• C. Magnetic Force

• D. Tension Force

Which law states that the total amount of energy in a closed system remains constant?

• A. Law of Conservation of Momentum

• B. Law of Definite composition

• C. Law of Conservation of Energy

• D. Law of Conservation of Mass