Work and Power
How much work is produced if the change in kinetic energy is 5 J?
5J
How much Kinetic energy does an object posses if it isn't moving?
None.
How much potential energy does a tennis ball on the ground posses?
None.
How much work is done by balancing a library book on your head with an upward force of 1 N and walking forward 10 m?
None, the force and distance must be applied in the same direction.
How does the amount of work change if time is increased?
No change, time isn't a part of the work equation.
How much kinetic energy does a 17kg dog posses if runs 12m/s?
1224 J
What happens to the potential energy if the mass of an object increases?
It increases, mass is a part of the potential energy equation.
If an objects posses 50000J of PE and is 1200m off of the ground, what is the mass of the object in grams?
4250 g
How much work is produced if you push a 5kg box 5m with a force of 3N
15 J
A ball traveling 10m/s has 45J of KE, what is it's mass?
.9 kg
How much PE does a 1kg ball have if it is resting 5m off of the ground?
49 J
A .2kg book travels 12m from rest in 18 seconds, how much kinetic energy does it posses?
.04 J
Less power is required when time is increased.
What happens to the kinetic energy if the mass of an object increases?
It also increases, mass is a part of the kinetic energy equation.
If a 2kg book posses 50J of PE, how high is it off of the ground?
2.55 m
A 3000kg truck has 6000 J of KE, what is it's velocity?
2m/s.
Watt is a unit of Power?
Watt is a unit of Power, you silly goose!
What happens to kinetic energy if the velocity of the object increases
It increases, velocity is a squared term in the kinetic energy equation.
What happens to the potential energy if the object is moved closer to the ground (height decreases)?
It decreases, height is a part of the potential energy equation.
If an object posses 1000J of PE and has a mass of 25kg, what height is it located at in cm?
408 cm