_________ is done only when a force is applied to an object and the object moves in the same direction of the applied force.
Work
100
___________ is defined as the rate at which work is done.
Power
100
_______ energy is referred to as the energy of position.
potential energy
100
The kind of energy associated with atomic bonds is...
chemical energy
100
Free-fall acceleration on the Earth is always _____ m/s^2
9.8
200
A boy exerts an average force of 65N when he lifts a box 1.2 m. How much work does he do?
78J
200
What is the gravitational potential energy of a 54kg box that is 8.0m above the ground?
4234J
200
_________________ states that energy cannot be created or destroyed, it is transformed into something else.
The law of conservation of energy
200
The energy due to motion
kinetic energy
200
Calculate the gravitational potential energy of a 93.0kg sky diver who is 550m above the ground.
5.0x 10^5 J
300
Which requires the most work?
a) a 10 kg weight resting on a table.
b) a person lifts a 1 kg weight 1 m off the floor.
B
300
How much power is required to do 180J of work in 2.4s?
75 Watts
300
At the top of its arc, a thrown ball has _______ potential energy.
maximum or the most
300
The energy of an object due to its position, shape, or condition.
potential energy
300
List three forms of energy.
kinetic, potential, mechanical, nonmechanical, chemical, electrical, nuclear, or light
400
A crane uses a block and tackle to lift a 2,200N flagstone to a height of 25m. How much work is done on the flagstone?
55,000J
400
How much power is required to left a 30.0N chair 0.20m in 2.0 s?
3.0Watts
400
Which is an example of mechanical energy?
a) potential energy
b) nuclear energy
A
400
The sum of an object's kinetic and potential energies.
Mechanical energy
400
What is the kinetic energy of a 0.015 kg snowball that is flying through the air at a speed of 3.5 m/s?
0.092J
500
55,000J of work is done to move a rock 25m. How much force was applied to accomplish moving the rock?
2200N
500
It takes 100kJ of work to lift an elevator 15m. If this is done in 20s, what is the average power of the elevator during this process?
75000J or 75kJ
500
When a pitcher throws a softball to a catcher, the vibration of the atoms that make up the softball is ______ energy, while the motion of the ball toward the catcher is ______ energy.
nonmechanical, mechanical
500
The energy that lies at the level of atoms and that does not affect motion on a large scale.
nonmechanical energy
500
Determine what form or forms of energy applies and specify if its mechanical or nonmechanical energy.
ex: a hot cup of soup
kinetic energy of the molecules (mechanical)
chemical energy of the molecules (nonmechanical)