Physical Science Momentum

What is momentum?

• A measure of motion defined as the mass times velocity of an object

• A measure of motion defined as the force times time of an object

• A measure of motion defined as the distance divided by time of an object

• A measure of motion defined as the acceleration times time of an object

What is the equation for momentum?

• p = m * v

• p = m / v

• p = m + v

• p = m - v

How is momentum impacted by mass and velocity?

(Directly proportional means as one thing increases, something else increases.

Inversely proportional means as one thing increases, something else decreases.)

• Momentum is directly proportional to mass and velocity

• Momentum is inversely proportional to mass and velocity

• Momentum is directly proportional to mass and inversely proportional to velocity

• Momentum is inversely proportional to mass and directly proportional to velocity

What is the law of conservation of momentum?

• The total momentum before a collision must equal the total momentum after the collision

• The total momentum before a collision is always greater than the total momentum after the collision

• The total momentum before a collision is always less than the total momentum after the collision

• The total momentum before a collision is unrelated to the total momentum after the collision

What are elastic collisions?

• Collisions in which both momentum and kinetic energy are conserved

• Collisions in which momentum is conserved but kinetic energy is not conserved

• Collisions in which kinetic energy is conserved but momentum is not conserved

• Collisions in which neither kinetic energy nor momentum is conserved

What are inelastic collisions?

• Collisions in which some of the kinetic energy is converted into other forms of energy

• Collisions in which both kinetic energy and momentum are conserved

• Collisions in which neither kinetic energy nor momentum is conserved

• Collisions in which momentum is conserved but kinetic energy is not conserved

What is thermal energy?

• Energy produced by the friction between objects involved in a collision

• Energy produced by the collision of objects when no heat is generated

• Energy produced by the transfer of thermal energy between two objects

• Energy produced by the permanent alteration of objects involved in a collision

What is the relationship between impulse and momentum?

• Impulse is equal to the change in momentum

• Impulse is equal to the force times time

• Impulse is equal to the mass times acceleration

• Impulse is equal to the velocity divided by time

What is the purpose of airbags in vehicles?

• To increase the time it takes for the driver's body to change from an initial velocity to zero

• To decrease the time it takes for the driver's body to change from an initial velocity to zero

• To increase the force applied to the driver's body during the change in momentum

• To decrease the force applied to the driver's body during the change in momentum

How do crumple zones in cars reduce the impact of momentum in a collision?

• By increasing the time it takes for the car exterior to crumple, thereby decreasing the force on the occupants

• By decreasing the time it takes for the car exterior to crumple, thereby decreasing the force on the occupants

• By increasing the force applied to the car occupants during the change in momentum

• By decreasing the force applied to the car occupants during the change in momentum