4th Mid-Quarter Examination

What does an object have when moving that it does not have when at rest?

• energy
• impulse
• inertia
• momentum

For any object to undergo an acceleration, which of the following must be considered?

• Object must loose energy.
• Object must gain energy.
• Object must have a zero net force.
• Object must be acted by an unbalanced force.

After running you took a rest, your momentum of 375 kg●m/s decrease to 0kg●m/s. What causes your momentum to become zero?

• inertia
• impulse
• mass
• velocity

Assuming that you are running in an oval field, what should you do to increase your momentum?

• stopping suddenly.
• slowing down.
• running faster.
• maintain your velocity.

When an unbalanced force is applied to an abject, it will make the object to accelerate, what term describes the effect of unbalanced force to the object?

• energy
• impulse
• inertia
• momentum

How can we describe the relationship of momentum to mass and velocity?

• The momentum of the object is directly proportional to both mass and velocity.
• The momentum of the object is inversely proportional to both mass and velocity.
• The momentum of the object is directly proportional to mass and inversely to velocity.
• The momentum of the object is inversely proportional to mass and directly to velocity.

Which of the statements is correct between the momenta of a tennis ball and a baseball thrown with the same horizontal velocity?

• The momentum of baseball is greater than the tennis ball because the baseball has greater mass.
• The momentum of tennis ball is greater than the baseball because the tennis ball has greater mass.
• both of the two balls have the same momenta.
• both of the two balls have zero momenta.

Padded dashboards in cars are safer in an accident than non-padded ones. How can padded dashboards help the person inside during an accident?

• It can increase time of impact.
• It can decrease impact force.
• Both A and B
• None of the above

Which of the following traffic violation usually causes vehicular collision?

• Over speeding and beating the red light.
• Slippery road and use of phones while driving.
• Driving when drunk and reckless driving.
• All the above

(2points) Suppose an accident is happening and spotted by Superman between a truck with 15,000 kg moving at 25 m/s and a train with 150,000 kg moving at 5 m/s. Which of the two vehicles needs a lesser time to be stopped?

• train
• truck
• both vehicles
• cannot be determined