Test: ACT Science

A scientist is exploring the nature of energy and work in two experimental systems.

Experiment 1

She first sets up a system with a ball on an inclined plane, and calculates the potential and kinetic energies of the ball at three positions. She places the ball at position 1, stops the ball after rolling to position 2, and then again allows it to roll to position 3. The measured kinetic and potential energies are shown in the table, along with measurements of the force of friction acting on the ball.

 

 

Ball Position

Potential Energy

Kinetic Energy

Force of Friction

1

150 kJ

X kJ

0 N

2

75 kJ

75 kJ

0 N

3

X kJ

150 kJ

0 N

 

Experiment 2

The same scientist then sets up another experiment with the same ball, again at three positions. The ball is provided a slight push, and then allowed to roll down three levels without any additional external input of energy.

She uses the following formulae to calculate the energy levels of the ball:

Potential Energy = Mass of the Ball x Acceleration Due to Gravity x Height of the Ball

Kinetic Energy = (1/2) x Mass of the Ball x (Velocity of the Ball)2

She also measures the internal energy of the ball, a value that she defines as the amount of energy contained in the motion of the molecules that make up the matter of the ball.

Untitled2

Position

Potential Energy

  Velocity

Internal Energy

1

A

1 m/s

5 kJ

2

B

5.47 m/s

6 kJ

3

C

10.94 m/s

7 kJ

 

1.

In Experiment 2, which of the following is most likely true?

Point 1 will have the greatest potential energy and the least kinetic energy.

Point 3 will have the greatest potential energy and the least kinetic energy.

Point 1 will have the greatest kinetic energy and the least potential energy.

Point 2 will have the greatest potential energy and the least kinetic energy.

1/40 questions

0%

Access results and powerful study features!

Take 15 seconds to create an account.
Start now! Create your free account and get access to features like:
  • Full length diagnostic tests
  • Invite your friends
  • Access hundreds of practice tests
  • Monitor your progress over time
  • Manage your tests and results
  • Monitor the progress of your class & students
By clicking Create Account you agree that you are at least 13 years old and you agree to the Varsity Tutors LLC Terms of Use and Privacy Policy.
Learning Tools by Varsity Tutors