HW4.3 Impulse and Momentum

An object that has momentum can be described as _________

• changing its velocity

• moving fast

• resisting changes in its state of motion

• having its mass in motion

• encountering a net force

Which one of these objects has the greater amount of momentum?

• A turtle that slowly crosses a road

• A parked car

• A stop sign

Which one of the following units represents the standard metric units of momentum

• Newtons * meter / second

• Kilograms * meter / second²

• meter / second

• Kilograms * meter / second

Which one of the following units represents the standard metric units of impulse

• Kilograms * meter / second²

• Newton * meter

• meter / second²

• Newton * second

During a collision. an object experiences an impulse. How can this impulse be calculated?

• Multiplying force by time

• Multiplying mass by velocity

• Dividing velocity by time

• Multiplying mass by acceleration

During a collision. an object experiences an impulse. The impulse causes and is equal to the _____ of the object

• energy change

• kinetic energy change

• force

• momentum

• momentum change

When a cannon fires a cannon ball, it recoils backwards. This occurs because of...

• Energy in the system is conserved

• Energy in the system is increased

• Momentum in the system is conserved

• Energy in the system is not conserved

A freight car of mass 20,000kg moves along a track at 15 m/s. What is the momentum of the car?

• 30,000 kg*m/s

• 3,000 kg*m/s

• 300,000 kg*m/s

• 3,000,000 kg*m/s

A 2kg object moving at 5 m/s encounters a 30 N resistive force over a duration of 0.10 seconds. The impulse experienced by this object is _____

• 0.30 N*s

• 2 N*s

• 2.5 N*s

• 3 N*s

• 7 N*s

A football player is running north down the field, and has a momentum of 120 kg*m/s. He experience a southward impulse of 200 N*s. What is the final momentum of the player

• 80 kg*m/s north

• 80 kg*m/s south

• 320 kg*m/s north

• 320 kg*m/s south