NEWish Amazing Unit 3 flashcardziz

Front

What is momentum?

Back

Momentum (p) is the product of an object's mass (m) and its velocity (v). It is a vector quantity, meaning it has both magnitude and direction. Formula: p = mv.

Front

How is impulse defined?

Back

Impulse is the change in momentum of an object when a force is applied over a period of time. It is calculated as Impulse = Force (F) x Time (t).

Front

What happens to force if the time of an impact is increased while keeping impulse constant?

Back

If the time of impact is increased, the force exerted during the impact decreases. This is because Impulse = Ft, so if t increases, F must decrease to keep impulse constant.

Front

Why do airbags reduce injury during a car crash?

Back

Airbags increase the time over which the car comes to a stop, reducing the force experienced by the occupants. This decreases the risk of injury.

Front

What is the relationship between mass, velocity, and momentum?

Back

Momentum is directly proportional to both mass and velocity. If either mass or velocity increases, momentum increases.

Front

If a car has a momentum of 10 kg m/s and its mass is 2 kg, what is its velocity?

Back

Velocity (v) can be calculated using the formula p = mv. Rearranging gives v = p/m. Thus, v = 10 kg m/s / 2 kg = 5 m/s.

Front

What is the effect of a brick wall versus a haystack on a car's force during a crash?

Back

A brick wall will exert a greater force on the car during a crash compared to a haystack, as the wall provides a much shorter stopping time.

Front

What is the formula for calculating impulse?

Back

Impulse (J) = Force (F) x Time (t). It can also be expressed as the change in momentum: J = Δp.

Front

If a car's speed doubles, what happens to its momentum?

Back

If the speed of a car doubles, its momentum also doubles, assuming mass remains constant. This is because momentum is directly proportional to velocity.

Front

What is the principle of conservation of momentum?

Back

The principle of conservation of momentum states that in a closed system, the total momentum before an event (like an explosion or collision) is equal to the total momentum after the event.