Physics Chapter 9
In physics, work is defined as - correct answer ✔e. force times distance
If you lift two loads up one story, how much work do you do compared to lifting
just one load up one story? - correct answer ✔d. twice as much
If you lift one load up two stories, how much work do you do compared to
lifting one load up only one story? - correct answer ✔d. twice as much
If Nellie Newton pushes an object with twice the force for twice the distance,
she does - correct answer ✔c. four times the work
The unit of work is the - correct answer ✔c. joule
Power is defined as the - correct answer ✔c. work done on an object divided
by the time taken to do the work
The unit of power is the - correct answer ✔e. watt
Potential energy is the energy an object has because of its - correct answer
✔c. location
The amount of potential energy possessed by an elevated object is equal to -
correct answer ✔d. the work done in lifting it
Kinetic energy of an object is equal to - correct answer ✔b. one half the
product of its mass times its speed squared
, How much farther will a car traveling at 100 km/s skid than the same car
traveling at 50 km/s? - correct answer ✔d. four times as far
An arrow in a bow has 70 J of potential energy. Assuming no loss of energy to
heat, how much kinetic energy will it have after it has been shot? - correct
answer ✔d. 70 J
Energy is changed from one form to another with no net loss or gain. - correct
answer ✔c. Always true
As a pendulum swings back and forth - correct answer ✔e. all of the above
When a car's speed triples, its kinetic energy - correct answer ✔d. increases
by nine times
Rockets are launched from an airplane in the forward direction of motion. The
kinetic energy of the airplane will be - correct answer ✔c. decreased
A job is done slowly, and an identical job is done quickly. Both jobs require the
same amount of work but different amounts of - correct answer ✔b. power
Which requires more work: lifting a 70-kg sack vertically 2 meters or lifting a
35-kg sack vertically 4 meters? - correct answer ✔c. both require the same
amount of work
A ball is thrown into the air with 100 J of kinetic energy which is transformed to
gravitational potential energy at the top of its trajectory. When it returns to its
original level after encountering air resistance, its kinetic energy is - correct
answer ✔c. less than 100 J
In physics, work is defined as - correct answer ✔e. force times distance
If you lift two loads up one story, how much work do you do compared to lifting
just one load up one story? - correct answer ✔d. twice as much
If you lift one load up two stories, how much work do you do compared to
lifting one load up only one story? - correct answer ✔d. twice as much
If Nellie Newton pushes an object with twice the force for twice the distance,
she does - correct answer ✔c. four times the work
The unit of work is the - correct answer ✔c. joule
Power is defined as the - correct answer ✔c. work done on an object divided
by the time taken to do the work
The unit of power is the - correct answer ✔e. watt
Potential energy is the energy an object has because of its - correct answer
✔c. location
The amount of potential energy possessed by an elevated object is equal to -
correct answer ✔d. the work done in lifting it
Kinetic energy of an object is equal to - correct answer ✔b. one half the
product of its mass times its speed squared
, How much farther will a car traveling at 100 km/s skid than the same car
traveling at 50 km/s? - correct answer ✔d. four times as far
An arrow in a bow has 70 J of potential energy. Assuming no loss of energy to
heat, how much kinetic energy will it have after it has been shot? - correct
answer ✔d. 70 J
Energy is changed from one form to another with no net loss or gain. - correct
answer ✔c. Always true
As a pendulum swings back and forth - correct answer ✔e. all of the above
When a car's speed triples, its kinetic energy - correct answer ✔d. increases
by nine times
Rockets are launched from an airplane in the forward direction of motion. The
kinetic energy of the airplane will be - correct answer ✔c. decreased
A job is done slowly, and an identical job is done quickly. Both jobs require the
same amount of work but different amounts of - correct answer ✔b. power
Which requires more work: lifting a 70-kg sack vertically 2 meters or lifting a
35-kg sack vertically 4 meters? - correct answer ✔c. both require the same
amount of work
A ball is thrown into the air with 100 J of kinetic energy which is transformed to
gravitational potential energy at the top of its trajectory. When it returns to its
original level after encountering air resistance, its kinetic energy is - correct
answer ✔c. less than 100 J
