NEWish Amazing Unit 3 flashcardziz

Front

What is the definition of force in physics?

Back

Force is an interaction that causes an object to change its velocity, which can include starting, stopping, or changing direction. It is measured in Newtons (N).

Front

What is impulse in physics?

Back

Impulse is the change in momentum of an object when a force is applied over a period of time. It is calculated as the product of force and the time duration over which the force acts.

Front

How does an airbag reduce injury during a car crash?

Back

An airbag increases the time over which the car comes to a stop, thereby reducing the force experienced by the occupants, which decreases the risk of injury.

Front

What happens to the impulse when a car crashes into a wall versus a haystack?

Back

The impulse is the same in both cases because impulse depends on the change in momentum, which is the same regardless of the object hit.

Front

What is the relationship between speed and impulse in a collision?

Back

Higher speed results in greater momentum, and thus a greater impulse is required to bring the object to a stop.

Front

What is the formula for calculating impulse?

Back

Impulse (J) = Force (F) × Time (t) or J = Δp (change in momentum).

Front

What is the difference between elastic and inelastic collisions?

Back

In elastic collisions, both momentum and kinetic energy are conserved. In inelastic collisions, momentum is conserved, but kinetic energy is not.

Front

What is the principle of conservation of momentum?

Back

The total momentum of a closed system remains constant if no external forces act on it.

Front

How does increasing the time of a collision affect the force experienced?

Back

Increasing the time of a collision decreases the average force experienced, as force is inversely proportional to the time over which the change in momentum occurs.

Front

What is the significance of the brick wall in a car crash scenario?

Back

A brick wall provides a sudden stop, resulting in a larger force and impulse compared to a haystack, which would allow for a more gradual stop.