Physics Review-1

Which object has more momentum?

• Baseball in the pitchers hand

• baseball, lost, in a messy room

• baseball in flight

• baseball in a catchers mitt

Which object has more momentum?

• motorcycle at 15 mph?

• bike at 15 mph

• car at a stoplight

• runner at 10 mph

If an object has a velocity of 15 m/s and a momentum of 30 kg.m/s, what is its mass?

• 450 kg

• 2 kg

• 4,500 kg

• 0.5 kg

If an object has a mass of 20 kg and a velocity of 4 m/s, what is the momentum of the object?

• 80 kgm/s

• 4 kgm/s

• 5 kgm/s

• .2 kgm/s

The impulse experienced by a body is equivalent to the body's change in

• velocity

• kinetic energy

• momentum

• force

Two skaters stand facing each other. One skater's mass is 60 kg, and the other's mass is 72 kg. If the skaters push away from each other without spinning,

• the lighter skater has lees momentum

• their momenta are equal but opposite

• their total momentum doubles

• their total momentum decreases

In a two-body collision,

• momentum is always conserved

• kinetic energy is always conserved

• neither momentum nor kinetic energy is conserved

• both momentum and kinetic energy are always conserved

The law of conservation of momentum states that

• the total initial momentum of all objects interacting with one another usually equals the total final momentum

• the total initial momentum of all objects interacting with one another does not equal the total final momentum

• the total momentum of all objects interacting with one another is zero

• the total momentum of all objects interacting with one another remains constant regardless of the nature of the forces between the objects

Two objects stick together and move with a common velocity after colliding. Identify the type of collision.

• elastic

• perfectly elastic

• inelastic

• perfectly inelastic

Two objects with different masses collide and bounce back after an elastic collision. Before the collision, the two objects were moving at velocities equal in magnitude but opposite in direction. After the collision,

• the less massive object had gained momentum

• the more massive object had gained momentum

• both objects had the same momentum

• both objects lost momentum