Momentum and Collisions

Two cars collide, lock bumpers and move together after the collision. What kind of collision is this?

• Elastic collision

• Inelastic collision

• perfectly inelastic collision

• Partially inelastic collision

Tags

NGSS.HS-PS2-2

In what kind of collision is kinetic energy always conserved?

• Elastic

• Inelastic

• Perfectly inelastic

• Partially inelastic

When two objects collide, not all of the energy remains in the form of motion. Some of it may be transformed into sound, heat, or deformation of the objects involved. These are signs that kinetic energy has been lost or converted into other forms. However, the motion of individual objects after the collision doesn’t always indicate energy loss—what matters is the total kinetic energy of the system before and after the collision.

Which of the following is not evidence that kinetic energy has been lost in a collision?

• The collision produces a sound

• At least one object is deformed

• One object is at rest after the collision

• One object increases in temperature

An object at +2.34 m/s collides with a stationary object of equal mass. After an elastic collision, object 1 is at rest. What is object 2’s speed?

• • + 2.34 m/s

• • - 2.34 m/s

• • + 1.17 m/s

• • - 1.17 m/s

Tags

NGSS.HS-PS2-2

A bowling ball has 9.0 kg·m/s momentum at 6.0 m/s. What is its mass?

• 54 kg

• 15 kg

• 3.0 kg

• 1.5 kg

Tags

NGSS.HS-PS2-1

An object’s momentum is calculated by multiplying velocity by what?

• Time

• Mass

• Acceleration

• Displacement

Tags

NGSS.HS-PS2-2

Which has more momentum: a stationary truck or a moving bicycle?

• Truck

• Bicycle

• Neither

• Same

Tags

NGSS.HS-PS2-2

__________ is a change in momentum.

• Impulse

• Gravity

• Mass

• Inertia

Tags

NGSS.HS-PS2-2

When a golf club hits a ball, the club’s momentum change is _____ the ball’s.

• Less than

• Greater than

• Equal and opposite to

• Equal in magnitude and direction

Tags

NGSS.HS-PS2-2

What is the momentum of a 225 g softball moving at 35 m/s?

• 7.9 kg·m/s

• 3.5 kg·m/s

• 5.0 kg·m/s

• 2.1 kg·m/s

Tags

NGSS.HS-PS2-2