Momentum and Impulse

The purpose of airbag in an automobile is to __________________.

• prolong the time of impact for a given change in momentum thereby reducing the force of impact

• deliver a greater force to the car occupant upon impact

• shorten the time of impact

• reduce the momentum of the vehicle

Two identical cars are traveling along EDSA. Which of the two cars would have greater monentum?

• slower car

• faster car

• both have the same momentum

• cannot be easily determined

The law of conservation of momentum states that the total amount of momentum of a group of objects does not change unless ___________.

• outside forces acts on the objects

• the objects are not moving

• the objects have different masses

• the objects exert forces on their surroundings

The momentum of a 15kg rock rolling at 3 m/s is ________.

• 18 kg.m/s

• 5 kg.m/s

• 45 kg.m/s

• 10 kg.m/s

Momentum is a product of _______ and velocity.

• weight

• mass

• direction

• acceleration

If an eagle and a bumblebee are both travelling at 10 km/h, which has greater momentum?

• eagle

• bumblebee

• both

• neither

Which has more momentum: a 5 kg fish swimming at 100 km/h or a 25 kg fish at rest?

• the 5 kg fish

• the 25 kg fish

• both

• neither

The impulse momentum relationship is a direct result of ______________.

• Newton's 1st law

• Newton's 2nd law

• Newton's 3rd law

• Newton's law of gravity

Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting the dashboard encounter ____________.

• lengthened the time of contact

• shorter time of contact

• decreased impulse

• increased momentum

When a truck comes to stop by crashing into a haystack or a brickwall, the stopping force is _______________.

• greater with haystack

• greater with brickwall

• both the same

• none of these