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 and how is it calculated?

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 x Time.

Front

Why do airbags reduce injury during a car crash?

Back

Airbags reduce injury by increasing the time over which the car comes to a stop, thereby decreasing the force experienced by the occupants.

Front

What is momentum and how is it calculated?

Back

Momentum is the product of an object's mass and its velocity, calculated as p = mv, where p is momentum, m is mass, and v is velocity.

Front

What happens to momentum in a perfectly inelastic collision?

Back

In a perfectly inelastic collision, momentum is conserved, but kinetic energy is not. The two objects stick together after the collision.

Front

What is the principle of conservation of momentum?

Back

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

Front

How does mass affect momentum?

Back

Momentum is directly proportional to mass; if mass increases while velocity remains constant, momentum increases.

Front

What is the relationship between speed and momentum?

Back

Momentum is directly proportional to speed; if speed increases while mass remains constant, momentum increases.

Front

What is the formula for calculating impulse?

Back

Impulse = Change in Momentum = Final Momentum - Initial Momentum.

Front

What is the effect of a longer stopping time on force during a collision?

Back

A longer stopping time reduces the average force experienced during a collision, as force is inversely proportional to time when impulse is constant.