REVIEW WEEKREVIEW WEEK

Day 4Day 4

MomentumMomentum

1. How do collisions relate to the conservation of energy?

2. What is the equation for momentum?

3. A .5kg bird is flying at a rate of 39m/s, what is the bird’s momentum?

4. What is the difference between an elastic and inelastic collision?

ImpulseImpulse

• What is the equation for impulse?• Why is it a good idea for a pugilist to roll

with a punch?• How does a runaway truck ramp help

prevent damage to a truck and driver?• How would the impulse change if you used

a thick chain instead of a bungee cord when you jumped off a bridge?

• How does a air bag take advantage of impulse to save lives?

Conservation of MomentumConservation of Momentum

• A 5kg fish swimming at 10m/s swallows a sleeping fish that weighs 2kg. How fast will the large fish be traveling after his meal?

• You are driving a golf cart that weighs 500lbs with you inside. If you are going 15mph and you suddenly jump out of the cart, how fast will it go?

Conservation of MomentumConservation of Momentum

• When you ride a bike at full speed and then hit the brakes hard, why do you have to push hard on the handlebars?

• Between mass and momentum, which is inertia and which is inertia in motion?

• A car with a mass of 1000kg moves at 20 m/s. What is its momentum?

• You can’t throw a raw egg at a wall without breaking it, but you can throw it at a loose sheet or a big pile of soft pillows. Explain this in terms of impulse.