Conservation of energy on ramps, swings and coasters

Answer Key - Grade 11 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   A toy coaster cart starts at rest with 60 J of gravitational energy. With no friction, at a lower point it has 25 J left. How much kinetic energy does it have there, Ari?

   35 J
2. 2.

   A toy coaster cart starts at rest with 80 J of gravitational energy. With no friction, at a lower point it has 30 J left. How much kinetic energy does it have there, Bo?

   50 J
3. 3.

   A toy coaster cart starts at rest with 45 J of gravitational energy. With no friction, at a lower point it has 12 J left. How much kinetic energy does it have there, Esme?

   33 J
4. 4.

   In the energy bar chart, what is the cart's kinetic energy at point C, Kira?

   • 14.7 J
   • 0 J, since it is at the bottom
   • 24.5 J
5. 5.

   A pendulum bob swings back and forth with no friction. Where is it moving fastest, Milo?

   • At the lowest point
   • At the highest points
   • Halfway up, between the two
6. 6.

   Where does a swinging pendulum bob stop for an instant, Noah?

   • At each highest point
   • At the lowest point
   • Nowhere, since it keeps swinging
7. 7.

   A toy coaster cart starts at rest on top of a frictionless hill. Where on the track is it fastest, Pia?

   • At the lowest point of the track
   • At the top of the hill
   • Halfway down the first slope
8. 8.

   With no friction, what stays the same as a cart rolls down a ramp, Ren?

   • Kinetic plus gravitational energy
   • The kinetic energy
   • The cart's speed, since the ramp is smooth
9. 9.

   With no friction, what happens to a cart's gravitational energy as it rolls down a ramp, Tala?

   • It turns into kinetic energy
   • It is used up
   • It stays the same
10. 10.

    A ramp has friction. What happens to a cart's total mechanical energy as it rolls down, Zee?

    • It falls, as some becomes thermal energy
    • It is destroyed by friction
    • It stays the same