Impulse &Momentum

 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?

• J=F*t
• F= (mvf-mvi)/t
• p=mv
• vf - vi = (F*t)/m

Cart A has a mass of 2 kilograms and a speed of 3 meters per second. Cart B has a mass of 3 kilograms and speed of 2 meters per second. Compared to the inertia and magnitude of momentum of Cart A, cart B has

• The same inertia and the same magnitude of momentum
• The same inertia and a smaller magnitude of momentum
• Greater inertia and the same magnitude of momentum
• Greater inertia and a smaller magnitude of momentum

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

A 1.5-kg lab cart is accelerated uniformly from rest in 4 m/s². What is the magnitude of the impulse producing this acceleration if it happened in 0.5 seconds? What formula do you use:

• p=mv
• mvf-mvi=Ft
• J=Ft
• F=(mvf-mvi)/t

Tags

NGSS.HS-PS2-1

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
• J=Ft
• F=(mvf-mvi)/t

A 0.1-kg model rocket’s engine is designed to deliver an impulse of 6.0 Newton*seconds. If the rocket engine burns for 0.75 seconds, what average force does it produce? Choose the right formula:

• p=mv
• mvf-mvi=Ft
• J=Ft
• F=(mvf-mvi)/t

Tags

NGSS.HS-PS2-1

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
• J=Ft
• F=(mvf-mvi)/t

When an accident happens, the truck hits the car with a force of 700 N in 0.25 seconds. What is the impulse? What formula do you use:

• p=mv
• mvf-mvi=/\p
• J=Ft
• F=(mvf-mvi)/t