Definitions
Formulas
Word Problems
Gravitational Forces
Electric Forces
100
Location of an object.
What is position?
100
Distance/Time=
What is speed?
100
Students in a class are measuring balls rolling down ramps. The classroom has some measuring sticks with centimeter markings and some with inch markings. The teacher tells the class to use the measuring sticks with centimeter markings.
A) Centimeters are better for measuring distance than inches.
B) Centimeters and inches measure different quantities.
C) If students use different units, some will get incorrect results.
D) It is easier to compare measurements when using the same units
What is "D) It is easier to compare measurements when using the same units"?
100
Pulls objects with mass toward each other.
What is force of gravity or gravitational force?
100
Exists between any two objects with electric charge—even if the objects aren’t touching.
What is electric force?
200
The steepness of a line.
What is slope?
200
Velocity/Time=
What is acceleration?
200
Ahmed is testing how different objects accelerate based on their mass. He runs three tests and records the data shown below.
Test Mass Acceleration
1 5 kg 3.5 kg
2 7 kg 2.8 kg
3 15 kg 1.2 kg
Why might Ahmed’s data be hard for other students to understand?
A) Ahmed should have collected more than three measurements
B) Ahmed recorded the wrong units for acceleration
C) Ahmed needs to measure more variables to understand motion.
What is "B) Ahmed recorded the wrong units for acceleration"? m/s^2
200
Astronomers are studying a planet with three moons of equal mass. The diagram below shows the locations of the moons at one point in their orbits.
A) Moon A
B) Moon B
C) Moon C
What is "C) Moon C"?
200
Objects with opposite charges will...
What is attract?
300
Designates an object's speed plus the direction of its motion.
What is velocity?
300
Speed/Time=
What is Velocity?
300
Alice's younger brother applies exactly the same force to each of the toy cars below.
Rank the accelerations of the toy car from least to greatest.
A) Z,Y,X
B) X,Y,X
C) Y,Z,W
What is "C) Y,Z,W"?
300
Michelle learned in science class that all objects with mass attract each other through gravity. While sitting at the dinner table, she notices that her plate and her mother’s plate do not move towards each other. However, both plates are pulled into the table by Earth’s gravity.
Why are the effects of gravity not visible between the two plates?
A) The plates have very small masses compared to the Earth, so there is no gravity between them.
B) The plates have very small masses compared to the Earth, so the gravitational pull between them is too small to notice.
C) The plates are not very close to each other, so the gravitational pull between them is too small to notice.
What is "B) The plates have very small masses compared to the Earth, so the gravitational pull between them is too small to notice."?
300
Objects with the same charge will...
What is repel?
400
The rate of change of velocity, or how fast an object or person speeds up.
What is acceleration?
400
Mass/Density=
What is volume?
400
In experiment 1, a student uses a spring to launch two bouncy balls with different masses. In each test, the spring is pulled back the same distance. The student records how far each ball travels.
In experiment 2, a student throws a baseball as hard as they can and records the speed using a speed radar. Then, the student throws the ball more softly and records the speed again.
Which experiment is the better test of how mass affects an object’s motion?
A) experiment 1, because the force is applied by a spring
B) experiment 1, because the same force is applied to different masses
C) experiment 2, because different forces are applied to the same mass
D)experiment 2, because the mass of the baseball is kept constant
What is "B) experiment 1, because the same force is applied to different masses"?
400
The table below shows the masses of three asteroids orbiting a star. Assume that all three asteroids are the same distance from the star.
Asteroid Mass(1015 kilograms)
Apus 100
Carina 205,000
Mon 259,000
Which asteroid experiences the greatest gravitational force from the star?
A) Apus
B) Carina
C) Mon
What is "C) Mon"?
400
A negatively-charged rubber balloon is sticking to Vivek’s shirt. It is attracted to the shirt’s positive charges. He then pulls the balloon farther away from his shirt.
How does the electric force between the balloon and Vivek’s shirt change when the balloon is moved?
A) The electric force increases
B) The electric force decreases
C) The electric force does not change.
What is "B) The electric force decreases"?
500
A measurement of how fast an object moves relative to a reference point.
What is speed?
500
Mass/Volume=
What is density?
500
Joe is playing a game at the fair. To win, he must throw a ball and knock down a bottle. Kim doesn’t think the bottle will fall over when the ball hits it because the action and reaction forces will cancel each other out.
Is Kim’s claim correct?
A) Yes, because the forces are equal and in opposite directions.
B) Yes, because the forces are equal and in opposite directions.Yes, because the forces are the same strength.
C) No, because the forces are acting in different directions.
D) No, because the forces are acting on different objects.
What is "D) No, because the forces are acting on different objects."?
500
Below is a diagram of Earth and the moon. Here, the moon is shown at one point in its orbit. Note that the diagram is not to scale.
In which direction will the moon experience a gravitational force from Earth?
A) to the left
B) upward
C) to the right
D) downward
What is "A) to the left"?
500
Violet is studying how electric force can change using two rubber balls. She charges the balls with equal amounts of positive charge and places them away from each other. Then, Violet triples the charge on one ball without changing the other ball.
How does the electric force between the balls change?
A) The electric force is reduced to a third of the original force.
B) The electric force stays the same.
C) The electric force is tripled.
D) The electric force is nine times bigger.
What is "C) The electric force is tripled."