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Question | Answer |
---|---|
A basketball player who has a mass of 61.2 kg jumps 0.5 meters vertically off the floor. What is her kinetic energy just before she hits the floor | 300J |
An object gains 10j of potential energy as it is lifted vertically 2.0 meters, the potential energy gained by the second object will be | 5.0J |
A constant force of 2.0 newtons is used to push a 3.0kg mass 4.0 meters across the floor. How much work is done on the mass | 8.0J |
A 20 kg object strikes the ground with 1960J of kinetic energy after falling freely from rest. How far above ground was the object when it was released | 10m |
A net force of 5.0 newtons moves a 2.0kg object a distance of 3.0 meters in 3.0 seconds. How much work is done on the object | 15J |
An object's KE is due to its | motion |
An object's PE is due to its | position and mass |
The work done in lifting an object | Both equals the PE given to it as it rises and Equals the KE that would be gained if it fell |
Which exerts more power | A man running up the stairs with a bag of potatoes |
Think about the equation for PE, and consider a 20 kg ball sitting on a 20 meter cliff on the MOON? Which is true | The ball has less PE than it would have on a 20m cliff on Earth |
Why is this guy safe if he lets go of the pendulum | Yes. Only if work is done on the pendulum, it won't gain any energy |
How much energy does Fred use if he lifts a 1 kg mass upward for a distance of 1 meter in 15 sec | 9.8J |
If his lab partner Carl raises the same weight the same distance in 11 seconds, does Carl exert more, less, or the same amount of power | more |
Which partner does more work | They do equal amount of work, while the work is equal to the PEg gained by raising the weight |