First Semester Exam Review

Question 1

Why are controls used?

Accepted Answer

for comparison

Question 2

Why is only one variable tested at a time?

Accepted Answer

If you test more than one, what gave you the answer?

Question 3

How many compost piles does Kevin need to test to see if turning it 1 or 2 times is better?

Accepted Answer

3

Question 4

Why are theories modified instead of being discarded?

Accepted Answer

the new evidence builds on the old evidence

Question 5

Weight is different from mass because weight depends on the

Accepted Answer

force of gravity

Question 6

Two cars move toward each other and collide. After the collision, the momentum of the cars is

Accepted Answer

The same as the original momentum

Question 7

How do Aaron's kinetic and potential energy change as he goes uphill?

Accepted Answer

his kinetic decreases and his potential energy increases

Question 8

Randy places metal in 3 types of acids. He also puts metal in water. What is the test variable?

Accepted Answer

the acid

Question 9

Sasha drops some of her ice cream on a hot sidewalk. Which of the following happens next?

Accepted Answer

Heat from sidewalk moves to ice cream increasing its temp.

Question 10

Randy places metal in 3 types of acids. He also puts metal in water. What is the control?

Accepted Answer

the water

Question 11

What force causes the ball to accelerate down once it is thrown?

Accepted Answer

gravity

Question 12

What is the correct order of the electromagnetic spectrum, from lowest to hghest freqency?

Accepted Answer

radio, microwave, infrared, visible, UV, x-ray, and gamma

Question 13

What is the advantage of using a model skeleton instead of a drawing?

Accepted Answer

3 dimensional

Question 14

During which time interval was the object moving fastest?

Accepted Answer

1 to 2 s

Question 15

Why do sound waves travel faster through a solid?

Accepted Answer

Solids are more dense.

Question 16

Your weight on the moon is 1/6 of your weight on Earth. Why do you weigh less on the moon?

Accepted Answer

The moon has less gravity because it has less mass.

Question 17

How does refraction cause a rainbow to form?

Accepted Answer

light hits water droplets in the air and slows down

Question 18

Which statement is an example of repetition?

Accepted Answer

Conduct 4 trials of counting bubbles from a plant for 1 min.

Question 19

Why does a rock sitting on top of a hill suddenly move?

Accepted Answer

An unbalanced force caused the rock to move.

Question 20

What is the correct explanation of the relationship between frequency and wavelength?

Accepted Answer

a long wavelength equals a low frequency

Question 21

Describe the motion on the graph.

Accepted Answer

The object moved at a constant speed.

Question 22

Is it possible to hear the train vibrations through the track before hearing them in the air?

Accepted Answer

Yes, sound travels through solids faster.

Question 23

Describe the transformation that occurs as light hits the solar cells of the calculator.

Accepted Answer

radiant to electrical

Question 24

Which energy transformation is taking place when you build a campfire?

Accepted Answer

chemical to radiant and thermal

Question 25

After a collision, the momentum of the cars will be ...

Accepted Answer

the same

Question 26

Paul notices that the ladder appears bent where it enters the water. What causes this?

Accepted Answer

refraction

Question 27

What could be a likely result of adding or removing heat from a substance?

Accepted Answer

a change of state

Question 28

Jenny did not write down the chemicals she used. What impact will this have on the results?

Accepted Answer

Her results will be inconclusive and unreliable.

Question 29

The law of conservation of energy states that when energy is transformed,

Accepted Answer

no energy is destroyed in the process

Question 30

Why do theories change?

Accepted Answer

new evidence was discovered

Question 31

How can you differentiate between a theory and a law?

Accepted Answer

A theory explains and a law states.

Question 32

What is the net force on the box if James pushes 12 N east, Bob 9 N west, and Jane 6 N east?

Accepted Answer

9 N east

Question 33

What force holds the balloon to the wall after it is rubbed against hair?

Accepted Answer

electrical force

Question 34

What energy transformation takes place when something burns?

Accepted Answer

chemical to thermal

Question 35

Describe the flow of heat when Randy places the objects into water that is 100 degrees.

Accepted Answer

heat from the water moves into Objects A, B, and C

Question 36

What is the best method for a biologist to use to study sharks?

Accepted Answer

observations

Question 37

What is an example of a non contact force?

Accepted Answer

a ball falling after being tossed in the air

Question 38

A soccer ball takes 20 s to roll 10 m. What is the average speed of the soccer ball?

Accepted Answer

0.5 m/s

Question 39

Randy places metal in 3 types of acids. What is the outcome variable?

Accepted Answer

the reaction

First Semester Exam Review

Questions 39

First Semester Exam Review

Questions 39