Question

1. momentum depends on mass and:

a. weight
b. speed
c. direction
d. height

1. if no net force acts on a system, momentum is:

a. lost
b. created
c. destroyed
d. conserved

1. a moving truck has more momentum than a car because it has

a. energy
b. mass
c. volume
d. temperature

1. when two objects collide, the total momentum after the collision:

a. changes randomly
b. is conserved
c. doubles
d. disappears

Explanation:

Question 41

Momentum is defined as \( p = mv \), where \( m \) is mass and \( v \) is velocity (speed with direction). But the formula's dependence here, in basic terms, relates to mass and speed (since velocity's magnitude is speed). Weight is force (\( F = mg \)), direction is part of velocity but the formula's primary factors are mass and speed (or velocity). Height and momentum are unrelated. So momentum depends on mass and speed.

The law of conservation of momentum states that if no net external force acts on a system, the total momentum of the system remains constant (conserved). So if no net force acts, momentum is conserved.

Momentum \( p = mv \). A truck typically has more mass than a car. Energy, volume, and temperature are not direct factors in momentum's comparison here (energy is related but not the reason for more momentum; volume and temperature are irrelevant). So a moving truck has more momentum than a car because it has more mass.

Answer:

B. Speed

Question 42