6th grade Review Sheet for 18 Week DCA
Energy Resources:
1. Which type of power uses the heat of the earth to make electricity?
geothermal
2. One advantage of perpetual or inexhaustible energy is?
It won’t run out. No pollution. Free to use (after initial expenses & upkeep)
3. An advantage of biomass over the use of coal would be?
It is renewable – you can make more. Less pollution,
4. What would be an advantage of using solar and wind power over using wood?
No pollution, it won’t run out, lasts longer,
5. What is an advantage of wind power over hydrogen power as an energy resource?
no pollution, won’t run out,
6. One disadvantage of using wind power to generate electricity is?
Wind isn’t always blowing everywhere, expensive to build, lots of maintenance, not
found everywhere.
7. List all the Energy Resources:
Inexhaustible
Wind, Geothermal, Solar
Renewable
biomass, hydropower
Non Renewable
coal, oil, natural gas
nuclear
Force and Motion/ Speed and Distance/Time graphs:
8. How do you know if something is moving?
Graph: line goes forward. Real life: change in distance
9. How does friction affect motion?
Friction resists movement. Slows down or stops motion
10. How does gravity affect the motion of an object?
More mass = stronger gravitational pull
11. How does the mass of an object affect the motion of an object?
Greater mass, slows down an object. Unless gravity is a part of it. Gravity pulls
harder on greater mass.
12. What is constant speed? How does constant speed look on a graph?
Straight line. No change in speed – no speed up, no slow down, no change
directions.
13. What is the difference between a balanced and unbalanced force?
Balanced force won’t move. Unbalanced force will move.
14. How can unbalanced forces change the motion of an object?
Too much force on one side of an object, will make the object move.
15. What is net force and how do you find it?
The total amount of force that actually make the object move. Subtract the
opposing forces to find net force.
16.
Define force.
A push or a pull
Draw a graph of a person:
17. Starting at the reference point, moving slowly away and then quickly comes back
18. Starting at the reference point and moving away from it at a constant speed.
to the reference point.
19. Starting at the reference point, moving quickly away.
20. Starting away from the reference point, quickly moving towards the reference
point, BUT before he/she gets to the reference point
21. Describe the steps of energy transformation from the image above:
chemical – thermal – mechanical – electrical - light
22. Which two objects will have a greater gravitational pull?
A
A and B = larger mass = greater grav. Pull.
C
B