Unit 4 Sem A Review

In a perfectly inelastic collision, what happens to the kinetic energy of the system?

• The kinetic energy of the system decreases.

• The kinetic energy of the system remains the same.

• The kinetic energy of the system is converted to potential energy.

• The kinetic energy of the system increases.

Describe the difference between elastic and inelastic collisions in terms of momentum and kinetic energy.

• Elastic collisions do not conserve momentum; inelastic collisions do.

• Both elastic and inelastic collisions conserve kinetic energy but not momentum.

• Elastic collisions conserve both momentum and kinetic energy; inelastic collisions conserve momentum but not kinetic energy.

• Elastic collisions result in a loss of total energy; inelastic collisions do not.

How do you calculate the total momentum before and after a 1D inelastic collision?

• Momentum is only conserved in elastic collisions.

• You calculate momentum by adding the masses of the objects involved.

• Total momentum is always zero in inelastic collisions.

• Total momentum is conserved: p_initial = p_final.

What is the principle of conservation of momentum?

• In a closed system, momentum can change over time.

• Momentum can be created or destroyed.

• In a closed system, total momentum remains constant.

• Total momentum is always equal to zero.

In a 2D elastic collision, how is momentum conserved in both x and y directions?

• Momentum is only conserved in the x direction during a 2D collision.

• Momentum can be lost in the y direction if the collision is perfectly elastic.

• Momentum is conserved in both x and y directions due to the conservation of momentum principle applied separately to each direction.

• Momentum conservation applies only to the total system, not individual directions.

What is the relationship between impulse and momentum change?

• Impulse is equal to the change in momentum.

• Impulse decreases momentum.

• Impulse is unrelated to momentum change.

• Momentum is the cause of impulse.

If two objects collide elastically in 1D, how do their masses affect the final velocities?

• The masses affect the final velocities by determining how momentum and kinetic energy are distributed between the objects.

• The final velocities are always equal regardless of the masses.

• The final velocities are solely determined by the initial speeds of the objects.

• Masses have no effect on the final velocities in elastic collisions.

Explain how to determine the angle of deflection in a 2D elastic collision.

• The angle of deflection can be calculated using only the initial velocities of the objects.

• The angle of deflection is solely determined by the mass of the colliding objects.

• The angle of deflection is irrelevant in elastic collisions and can be ignored.

• The angle of deflection in a 2D elastic collision can be determined by analyzing the conservation of momentum and kinetic energy, leading to the calculation of final velocities and angles.

What is the significance of the coefficient of restitution in collisions?

• It determines the angle of impact during a collision.

• It measures the speed of the objects before collision.

• It indicates the mass of the colliding objects.

• The coefficient of restitution indicates the elasticity of a collision and helps predict post-collision behavior.

How do you calculate impulse when given the change in momentum?

• Impulse is the product of mass and velocity.

• Impulse is equal to the change in momentum.

• Impulse is half the change in momentum.

• Impulse is calculated by dividing momentum by time.