PHY102 – Ultimate Energy, Work & Circular Motion
Q&A Guide | 200+ Verified Physics Problems
Energy that is stored due to the position of an object may be called ____ energy. -
potential
A 20-kilogram object falls 2.0 meters to the floor. At what point in its fall does the kinetic energy
of a body equal its potential energy? - Halfway to the floor
An object falls without friction near Earth's surface. The loss of its potential energy is equal to
its: - gain in kinetic energy.
The diagram below represents a cart traveling from left to right along a friction-less surface with
an initial speed of 3 m/sec. At what point is the potential energy least? - B
Potential energy increases as a marble: - slows rolling up an incline.
Lifting a 70-kilogram barbell 2.0 meters above the floor increases its potential energy by about: -
1,400 joules.
The amount of mechanical kinetic energy possessed by a 0.25-kilogram ball rolling at a speed of
2.5 meters per second is ____ joules. - 0.78
As the speed of a moving object doubles, the amount of mechanical kinetic energy that it
possesses: - increases by four times.
Jonah is pushing his younger sister, Jessica, on a swing. If Jessica weighs 35 kilograms, how
much higher above the ground must Jonah push her to increase her potential energy by 525
joules? - 1.5 meters
Shawna, who weighs 54 kilograms, is roller blading on a level surface. If she is rolling at 12
meters per second, to what height would she roll up an incline before stopping? (Assume there
is no friction.) - 7.3 meters
, Which of the following energy forms is associated with an object in motion? - kinetic
energy
Which of the following energy forms is associated with an object due to its position? - potential
energy
Which of the following energy forms is not involved in hitting a tennis ball? - chemical potential
energy
Which of the following formulas would be used to directly calculate the kinetic energy of an
object with mass m bouncing up and down on a spring with spring constant k? - KE= 1/2
mv^2
Ball A has triple the mass and speed of ball B. What is the ratio of the kinetic energy of ball A to
ball B. - 27
What is the kinetic energy of a 0.135 kg baseball thrown at 40.0 m/s? - Given: m=0.135kg
v=40.0m/s
Solution: KE= 1/2 mv 2 = 1/2 (0.135kg)(40.0m/s) 2 =108 J
The main difference between kinetic energy and potential energy is that - kinetic energy
involves motion, and potential energy involves position.
Which form of energy is involved in weighing fruit on a spring scale? - elastic potential
energy
Gravitational potential energy is always measured in relation to - a zero level.
The equation for determining gravitational potential energy is PE g= mgh. Which factor(s) in this
equation is (are) not intrinsic to an object? - both g and h
Which of the following parameters does not depend on how resistant a spring is to being
compressed or stretched? - relaxed length
Q&A Guide | 200+ Verified Physics Problems
Energy that is stored due to the position of an object may be called ____ energy. -
potential
A 20-kilogram object falls 2.0 meters to the floor. At what point in its fall does the kinetic energy
of a body equal its potential energy? - Halfway to the floor
An object falls without friction near Earth's surface. The loss of its potential energy is equal to
its: - gain in kinetic energy.
The diagram below represents a cart traveling from left to right along a friction-less surface with
an initial speed of 3 m/sec. At what point is the potential energy least? - B
Potential energy increases as a marble: - slows rolling up an incline.
Lifting a 70-kilogram barbell 2.0 meters above the floor increases its potential energy by about: -
1,400 joules.
The amount of mechanical kinetic energy possessed by a 0.25-kilogram ball rolling at a speed of
2.5 meters per second is ____ joules. - 0.78
As the speed of a moving object doubles, the amount of mechanical kinetic energy that it
possesses: - increases by four times.
Jonah is pushing his younger sister, Jessica, on a swing. If Jessica weighs 35 kilograms, how
much higher above the ground must Jonah push her to increase her potential energy by 525
joules? - 1.5 meters
Shawna, who weighs 54 kilograms, is roller blading on a level surface. If she is rolling at 12
meters per second, to what height would she roll up an incline before stopping? (Assume there
is no friction.) - 7.3 meters
, Which of the following energy forms is associated with an object in motion? - kinetic
energy
Which of the following energy forms is associated with an object due to its position? - potential
energy
Which of the following energy forms is not involved in hitting a tennis ball? - chemical potential
energy
Which of the following formulas would be used to directly calculate the kinetic energy of an
object with mass m bouncing up and down on a spring with spring constant k? - KE= 1/2
mv^2
Ball A has triple the mass and speed of ball B. What is the ratio of the kinetic energy of ball A to
ball B. - 27
What is the kinetic energy of a 0.135 kg baseball thrown at 40.0 m/s? - Given: m=0.135kg
v=40.0m/s
Solution: KE= 1/2 mv 2 = 1/2 (0.135kg)(40.0m/s) 2 =108 J
The main difference between kinetic energy and potential energy is that - kinetic energy
involves motion, and potential energy involves position.
Which form of energy is involved in weighing fruit on a spring scale? - elastic potential
energy
Gravitational potential energy is always measured in relation to - a zero level.
The equation for determining gravitational potential energy is PE g= mgh. Which factor(s) in this
equation is (are) not intrinsic to an object? - both g and h
Which of the following parameters does not depend on how resistant a spring is to being
compressed or stretched? - relaxed length
