PHYSICS: ENERGY EXAM QUESTIONS
WITH 100% CORRECT ANSWERS{
GRADED A+}
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.
WITH 100% CORRECT ANSWERS{
GRADED A+}
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.
