MC (Part 3) - Review (Amos)

A moving truck suddenly brakes to avoid hitting a pedestrian. Which factor most effectively reduces the truck’s momentum safely?

• Reducing its mass

• Increasing road friction

• Increasing braking time

• Turning the steering wheel sharply

Why are modern cars designed to crumple upon impact during collisions?

• To make repairs easier

• To absorb momentum

• To increase the force experienced by passengers

• To extend the impact time, reducing force

A ball bounces off the wall with the same speed it hit. Compared to a ball that sticks to the wall, what can be said about the impulse it experiences?

• Same impulse

• Less impulse

• Greater impulse

• No impulse at all

A boxer "rides" a punch by moving backward as it lands. Physically, what’s being minimized here?

• Time of impact

• Mass of the punch

• Momentum of the punch

• Force felt due to increased impact time

During a collision, airbags inflate. What role do airbags primarily play in the physics of the crash?

• They change the vehicle’s momentum

• They transfer momentum to the seatbelt

• They increase impact time, reducing force

• They reduce the car’s speed before impact

A student drops a raw egg and a boiled egg from the same height. The raw egg breaks while the boiled one doesn’t. What best explains the difference?

• The raw egg has more momentum

• The boiled egg is heavier

• The shell of the raw egg is weaker

• The internal fluid in the raw egg doesn't absorb impact force effectively

In a crowded train, a passenger standing feels a sudden jolt when the train halts. Which concept best explains the sensation?

• Inertia of motion

• Conservation of energy

• Static equilibrium

• Force of friction

Two skaters push off each other. One is significantly heavier. Who moves faster and why?

• Heavier skater, due to greater strength

• Lighter skater, to conserve momentum

• Both equally, due to Newton’s Third Law

• Neither, because total force is balanced

Why is it safer to fall on a gym mat than on concrete?

• Gym mats absorb all momentum

• Gym mats reduce weight

• Gym mats increase the impact time

• Concrete increases gravity's effect

A person jumps off a boat and the boat move backward. This best illustrates:

• Law of universal gravitation

• Law of inertia

• Conservation of energy

• Conservation of momentum