Energy
Collisions
Momentum
Work and
Power
Challenge Questions
100
Kinetic and Potential Energy
What are the two main forms of mechanical energy?
100
Inelastic and Elastic
What are the two main forms of Collisions?
100
If Super man at rest in free space throws an asteroid that has more mass, which is faster?
Who is Superman?
100
Joule or Newton Meter
What is the unit of work?
100
Distinguish between impact and impulse.
impact is a force and impulse is a force multiplied by time.
200
something that enables an object to do work
What is Energy?
200
When humans collide is it elastic or inelastic?
inelastic collision
200
mass X velocity
What is the equation for Momentum?
200
the quantity of force times distance
What is Work?
200
3 levers
How many basic types of levers are there?
300
The energy due to the position of something
What is Potential Energy?
300
What kind of collision is more common in the everyday world?
Inelastic Collisions
300
Product of force and time interval during which force acts
What is impulse?
300
What must be done in order for work to take place?
The application of a force and movement of an object by that force
300
Why is it advantageous for a boxer to ride with a punch?
When the boxer moves away from the punch he increases his time of impact and reduced the force of the impact.
400
mass X gravity X height
What is the formula for Potential Energy?
400
two freight cars of equal mass. one of them is moving at 4 m/s at the other which is at rest. what is the velocity of one of the cars after the collision?
2 m/s. (m)(4 m/s) +(m)(0 m/s) = (2m)(V after)
400
T or F. A short time of impact force will result in a small change in momentum.
False
400
Work done/time interval
What is the equation for power?
400
Useful work output/total work input
What is the formula for efficiency?
500
Energy can not be created or destroyed. It can be transformed from one form to another, but the total amount never changes
What is the Law of Conservation of Energy?
500
(net mv) before = (net mv) after
What is the equation for Inelastic Collisions?
500
In the absence of an external force, the momentum of a system remains unchanged
What is the Law of Conservation of Momentum?
500
If a forklift is replaced with a new forklift that has twice the power, how much greater a load can it lift in the same amount of time?
twice the load in the same time
500
When the brakes of a motorcycle travelling at 60 km/h become locked, how much farther will the motorcycle skid than if it were travelling at 20 km/h
Nine times father.the motorcycle has nine times as much energy when it travels three times as fast.
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