Concept Quiz 9.1-9.3 (Impulse-Momentum, Conservation)

The momentum of an object depends upon the object's ________. Pick two quantities.

• mass - how much stuff it has

• acceleration - the rate at which the stuff changes its velocity

• weight - the force by which gravity attracts the stuff to Earth

• velocity - how fast and in what direction it's stuff is moving

• position - where the stuff is at

Momentum is a ________ .

(a)  

• vector
• scalar
• type of energy
• type of force

Which are complete descriptions of the momentum of an object? Circle all that apply.

• 2.0 kg•m/s, east

• 7.2 kg•m/s, right

• 6.1 kg•m/s^2, down

• 4.2 m/s, east

• 1.9 kg•m/s, west

The two quantities needed to calculate an object's momentum are ________ and ________.

• mass and speed

• mass and acceleration

• mass and velocity
• velocity and force

Consider the mass and velocity values of Objects A and B. Compared to Object B, Object A has ​ (a)   momentum.​

• more
• less
• the same

Calculate the momentum value of a 2.0-kg brick moving through the air at 12 m/s with a force of 20 N on it from gravity.

• 6 kg*m/s
• 24 kg*m/s
• 240 kg*m/s

• 10 kg*m/s

Calculate the momentum value of a 3.5-kg wagon moving along the sidewalk at 1.2 m/s after a force of 6 N is applied.

• 4.2 kg*m/s

• 7.2 kg*m/s

• 2.91 kg*m/s

• 21 kg*m/s

With what velocity must a 0.53-kg softball be moving to equal the momentum of a 0.31-kg baseball moving at 21 m/s?

• 3.45 m/s

• 12.3 m/s

• 21 m/s

• 27.8 m/s

Insert words into the four blanks of the sentence: In a collision, an object experiences a(n) ​ (a)   acting for a certain amount of ​ (b)   , and which is known as a(n) ​ (c)   ; it serves to change the ​ (d)   of the object.​

• force
• time
• impulse
• momentum
• mass
• acceleration
• impact
• weight

A(n) ______ causes and is equal to a change in momentum.

• force

• impact

• impulse

• collision