Test #1: Scientific Method/Motion nad Momentum

Question 1

What is the difference between distance and displacement?

Answer 1

Distance is how far you travel, Displacement is the shortest distance between the starting point and the ending point WITH a direction.

Question 2

What is instantaneous speed?

Answer 2

Speed at one specific moment of time. Looking at a speedometer tells you your instantaneous speed.

Question 3

On a distance-time graph, what does a horizontal line mean?

Answer 3

No change in position has occurred. The object is not moving.

Question 4

How are speed and velocity different?

Answer 4

Velocity of an object is the SPEED, but it also includes a direction whereas speed is just distance traveled divided by the time it takes to travel that distance.

Question 5

What does the slope of two lines on a distance-time graph tell you?

Answer 5

Relative speed. The steeper the line, the greater the speed.

Question 6

Speeding up, slowing down, and changing directions are all examples of ______________.

Answer 6

Acceleration

Question 7

If a race car is driving around a track at a constant speed, is it accelerating? Why or why not?

Answer 7

Yes. Even though it is not speeding up or slowing down, it is changing directions around the track. Therefore, the race car is accelerating.

Question 8

What is the relationship between mass and inertia?

Answer 8

The more mass an object has, the more inertia it has.

Question 9

What two things affect the momentum of an object?

Answer 9

Mass and Velocity

Question 10

Define Inertia

Answer 10

The tendency of an object to resist a change in it’s motion. In other words, if an object is moving, it wants to continue moving at the same speed in the same direction. If an object is at rest, it wants to stay at rest. Inertia is the reason we should wear seatbelts in a vehicle.

Question 11

What are the steps of the scientific method?

Answer 11

Ask a question/Define Problem
State Hypothesis
Test Hypothesis/Experiment
Analyze Data
Draw Conclusions

Question 12

Qualitative Data

Answer 12

Data you collect with your senses. It might include color (the liquid was blue), how something feels (the substance was sticky), if something has an odor (the sample smelled fruity.)

Question 13

In order for something to have momentum it must…

Answer 13

be moving

Question 14

What lab instrument would you use to find out the mass of an object?

Answer 14

A balance

Question 15

A graduated cylinder is utilized for measuring…

Answer 15

volume

Question 16

Before using a balance, you must first make sure it is

Answer 16

zeroed. (Remember there is a little knob underneath the balance that you turn to make it level before you start!)

Question 17

The following are all examples of:
m/s
km/hr
yds/min
mph
cm/yr

Answer 17

Speed

Question 18

True or False: Gravity helps determine your mass?

Answer 18

False. Mass does not change according to location. Weight, however does. Your weight on the moon and your weight on earth are different because of the pull of gravity.

Question 19

Explain what a car is doing if it’s acceleration is -3.5 mi/hr/sec

Answer 19

The car is slowing down.

Question 20

If I wanted to know an object’s velocity, I would need to know 2 things. What are they?

Answer 20

How fast the object is going and in what direction the object is moving.

Question 21

Explain how to use a graduated cylinder.

Answer 21

Get eye level.
If the liquid is clear, place a colored piece of paper behind the cylinder to make it easier to see.
Read the level from the bottom of the meniscus (the curve of the liquid).

Question 22

Mass measures…

Answer 22

The amount of matter in an object

Question 23

If an object’s speed decreases, what happens to its momentum?

Answer 23

Momentum is mass x velocity. Since velocity and speed are the same thing (except direction), if the object’s speed decreases momentum decreases also.

Question 24

A change in speed per a unit of time is….

Answer 24

Acceleration

Question 25

On a Speed vs Time graph, what does a downward sloping line signify?

Answer 25

The object is slowing down (decelerating).

Question 26

24.6 meters. What kind of data is this?

Answer 26

Quantitative

Question 27

km/min

Answer 27

Speed

Question 28

The smoke was black. What kind of data is this?

Answer 28

Qualitative

Question 29

If a student were doing an experiment trying to determine the time of day their pet hamster is most active (from 8-10 am, 10-12am, 12-2 pm, or 2-4 pm) what is the independent variable and dependent variable?

Answer 29

IV: The time of day
DV: How active the hamster is