Skills of Science
Force and Equilibrium
Newton's First Law
Linear Motion
Projectile Motion
100
This is a term for anything that you can change or measure in an experiment.
Variable
100
Objects don't change their state of motion without this present.
Net Force
100
Aristotle divided up the laws of physics into these two types of motion.
Natural and Violent Motion
100
True or false: Depending on your perspective, an object can have different velocities, or even no velocity, and each measurement can be correct.
True, because motion is relative.
100
True or false: For a projectile on Earth, the horizontal speed is most important for determining how long the object flies for.
False, it is the vertical direction
200
This is the term for an educated guess about some aspect of the natural world, which can later be tested and built on.
Hypothesis
200
Force is a vector, which means it has both _______ and _________.
Magnitude and direction
200
Objects do not change their speed or direction without a force to make them do so. In other words, they resist changes to their state of motion. What is the term for this property?
Inertia
200
How are instantaneous and average speed different?
One is the speed at a single instant, one is the speed over the whole trip.
200
True or false: In the absence of gravity, projectiles don't travel in an arc, but a straight line.
True
300
This is the two-word term for the element of the experiment that is changed by the experimenter, such as the number of pasta noodles in the Marble Cup experiment.
Independent Variable
300
To find the sum of two vectors pointing in different directions, we can arrange them into this shape, and find the diagonal, which is the sum of the vectors.
Parallelogram
300
Galileo proved that natural motion doesn't exist, and all objects fall at the same rate, with what experiment?
Dropping two objects from the top of a tower.
300
True or false: A car driving around in a circle at a constant speed of 30 m/s is undergoing a constant acceleration.
True, because it is changing direction.
300
What is the direction of the acceleration of a projectile at the top of its arc?
Straight Down
400
This is a term for the aspects of an experiment that need to be held constant and unchanged in order for the experiment to clearly communicate its data.
Control Variables
400
Math Question:
An airplane flies due north at 300 m/s, while a wind blows due east at 400 m/s. What direction and at what speed is the airplane travelling, in total.
500 m/s Northeast
400
Galileo proved that violent motion doesn't exist, and horizontal motion can last forever, with which experiment?
Rolling balls down ramps.
400
An object that falls freely through the air will speed up over time, and its speed will increase by this amount every second.
9.8 or 10 m/s^2
400
A projectile at the top of a 30 m cliff is kicked horizontally with a speed of 10 m/s. How far from the base of the cliff does it land?
30 = (1/2)*10*t2
6 = t2
t = sqrt(6) = 2.45 s
d = 10*2.45
d = 24.5 m
500
In an experiment, it is found that increasing one variable causes another to decrease by the same factor. What two-word term describes this relationship?
Negative Correlation
500
This object is subject to 4 different forces, as indicated below. What is the net force, and in what direction does it go?
34 N, Down and the the right
500
How are mass and weight different from each other?
One is a measure of the inertia of an object, and one is the measure of gravity's pull on the object.
500
A basketball player is able to jump vertically and stay in the air for 0.6 seconds. How high does this person reach during their jump?
d = (1/2) a*t^2
t = 0.6/2 = 0.3
d = 1/2*10*0.3^2
d = 0.45 m = 45 cm
500
A ball is kicked diagonally upwards with both a vertical and horizontal velocity of 20 m/s.
How much distance does the ball cover before hitting the ground?
t = 4 s
d = 20*4 = 80 m