Momentum and Impulse (Alternative for page 102 )

A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s. The impulse on the ball is ______ N s.

• -2.5

• -10

• -18

• -45

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

A force of 221 N is applied to a 10 kg object for 0.4 seconds. Calculate the impulse experienced by the object.

• 88.4 Ns

• 4 Ns

• 2210 Ns

• 22.1 Ns

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

Check ALL that apply.

Impulse is:

• The force that creates an acceleration.

• The change in momentum.

• the change in velocity that can be caused by a constant force over some discrete amount of time.

• A vector

• NOT a vector

Tags

NGSS.HS-PS2-2

A 60-kg student jumps down from the library counter. At the instant he lands on the floor his speed is 3 meters per second. If the student stops in 0.2 seconds, what is the average force of the floor on the student? Which formula do you use?

• Imp=F*t

• F= (mvf-mvi)/t

• p=mv

• vf - vi = (F*t)/m

A mother pushes her 120-Newton child in a swing. If the mother exerts a 10-Newton force on the child for half a second, what is the magnitude of the impulse imparted to the child by the mother? What formula do you use:

• p=mv

• mvf-mvi=Ft

• Imp=Ft

• F=(mvf-mvi)/t

If a ball that 2kg is dropped and hits the floor with a velocity of 10m/s in 1 second, then what is the change in momentum? Choose the right formula:

• p=mv

• mvf-mvi=/\p

• Imp=Ft

• F=(mvf-mvi)/t

How do the following variables change if you drop an egg on a pillow rather than cement?

• constant impulse, increasing time, decreasing force
• increasing impulse, increasing time, increasing force
• constant impulse, increasing time, increasing force
• decreasing impulse, decreasing force, increasing time

Tags

NGSS.HS-PS2-1

If you jump from an elevation, you bend your knees to allow for

• you to catch your breath.

• extend the time it takes to decrease your momentum.

• decrease the time it takes to decrease your momentum.

• increase the Force your knees experience.