SCIENCE ANSWER KEYS

ANSWER KEY

#	ANSWER
1	B) Friction
2	B) It increases
3	D) Fluid friction
4	D) Perpendicular to the surface
5	A) Friction always causes an object to slow down
6	D) Transformation
7	A) Kinetic energy
8	B) Potential energy
9	D) Mechanical energy
10	A) Photosynthesis
11	B) Pulley
12	D) Inclined plane
13	A) Lever
14	D) Wheel and axle
15	A) Screw
16	D) A sled sliding down a snowy hill
17	B) It increases
18	D) Fluid friction
19	A) Energy cannot be created or destroyed, only transformed from one form to another
20	D) Chemical energy
21	A) It increases
22	A) Work is a measure of energy
23	A) Thermal energy
24	A) By increasing the distance over which the force is applied
25	D) By decreasing the amount of force applied
26	B) Frictional force only
27	B) To the left with a net force of 10 N
28	A) At the highest point of its path
29	B) It is transformed into thermal energy
30	B) It decreases
31	C) Electrical energy
32	C) It increases
33	A) Thermal energy
34	B) It decreases
35	A) It increases
36	C) 50 N
37	B) Thermal energy
38	C) It is transformed into thermal energy
39	A) Kinetic energy
40	B) Pulley
41	d) Decrease the surface area of the object
42	c) Solar power
43	d) A pendulum swinging back and forth
44	a) Electrical energy to mechanical energy
45	c) Pulley
46	c) The surface area of the object
47	c) A generator
48	a) Copper
49	d) Pulley
50	c) The number of pulleys used