Work
A force needs to act on the object and the object must be displaced
What are the conditions for work to be done?
energy of motion
What is kinetic energy?
stored energy
What is potential energy?
energy can only be transformed not destroyed
What is the Law of Conservation of Energy?
A force of 4 N acts on an object. The object is displaced 2 m in the direction of the applied force. What work was done?
What is 8 J?
Climbing a tree or pushing a box across the floor
What are examples of work?
the work done to accelerate an object to its current velocity
What is kinetic energy?
Properties of the object AND environmental interactions
What are the factors determine the potential energy of an object?
A ball begins rolling down a hill
What is an example of potential energy transforming into kinetic energy?
If 6 joules of work was done lifting an object weighing 3 N, how far was the object lifted?
What is 2 meters?
Force = zero OR displacement = zero
What are the conditions under which no work is done?
The net work done by a net force acting on an object is equal to the change in the kinetic energy of the object
What is the work-kinetic energy relationship?
When an object is raised, work is done against gravity
A ball rolling down a 6 meter tall hill reaches a distance of 3 meters down hill.
What is the point in the ball's motion where its potential energy equals its kinetic energy?
An object with a mass of 2 kg is moving with a constant velocity of 5 m/s. What is its kinetic energy?
What is 25 J?
What is positive work?
a moving bullet pierces a target
What is an example of an object's capability of doing work?
A stretched rubber band
What is an example of elastic potential energy?
This form of energy is represented in a wind turbine when this is turned into electric energy
What is mechanical energy?
What is the potential energy of an object with a mass of 20 kg if it is held at a height 8 meters above the ground?
What is 160 J?
Newton-meters
What is the unit for work?
Sam is standing still in line.
What is an example of an object with no kinetic energy?
K
What is the spring constant?
Just above the ground
What is the point at which a falling object will have the most kinetic energy?
How much power did a girl weighing 300 N expend when she climbed up a 15 meter hill in 1000 seconds?
What is 4.5 W?