Momentum & Collisions

If a particle’s kinetic energy is zero, what is the

momentum?

• zero

• $1\ kg\cdot\frac{m}{s}$

• $15\ kg\cdot\frac{m}{s}$

• negative

What is the momentum of a 0.148 kg baseball

thrown with a velocity of 35 m/s toward home plate?

• 5.1 kg∙m/s toward home plate

• 5.1 kg∙m/s away from home plate

• 5.2 kg∙m/s toward home plate

• 5.2 kg∙m/s away from home plate

After being struck by a bowling ball, a 1.5 kg bowling

pin slides to the right at 3.0 m/s and collides head-on

with another 1.5 kg bowling pin initially at rest.

What is the final velocity of the second pin if the first

pin moves to the right at 0.5 m/s after the collision?

• 2.5 m/s to the left

• 2.5 m/s to the right

• 3.0 m/s to the left

• 3.0 m/s to the right

For a given change in momentum, if the net force

that is applied to an object increases, what happens

to the time interval over which the force is applied?

• The time interval increases.

• The time interval decreases.

• The time interval remains the same.

• It is impossible to determine the answer from the information given.

Which equation expresses the law of conservation

of momentum?

• $p=mv$

• $m_1v_{1,i}+m_2v_{2,i}=m_1v_{1,f}+m_2v_{2,f}$

• $\frac{1}{2}m_1v_{1,i}^2+m_2v_2=\frac{1}{2}\left(m1+m2\right)v_f^2$

• $KE=p$

Two shuffleboard disks of equal mass, one of which

is orange and one of which is yellow, are involved in

an elastic collision. The yellow disk is initially at rest

and is struck by the orange disk, which is moving

initially to the right at 5.00 m/s. After the collision,

the orange disk is at rest. What is the velocity of the

yellow disk after the collision?

• zero

• 5.00 m/s to the left

• 2.50 m/s to the right

• 5.00 m/s to the right

Cart A is pulled with a 2 Newton force for 2 seconds, and Cart B is pulled with a 1 Newton force for 3 seconds.  Which cart experiences the greatest impulse?

• Cart B
• Cart A
• they are the same

A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.

Calculate the impulse on the ball.

• 1 N·s

• 6 N·s

• 66 N·s

• None of these

Tags

NGSS.HS-PS2-1

The purpose of crumble zones on a car is to

• decrease time of impact.
• increase force of impact.
• increase the time of impact.
• decrease the impulse during impact.

Tags

NGSS.HS-PS2-3

The difference between a car hitting a wall vs. a car hitting a hay stack is

• the Impulse on the car hitting the wall is greater
• the change in momentum of the car hitting the wall is greater
• the force on the car hitting the hay stack is greater
• the collision time of the car hitting the hay stack is greater

Tags

NGSS.HS-PS2-2