State Newton's law of universal gravitation.
Every object in the universe attracts every other object.
TRUE or FALSE: Electromagnetic force is associated with charged particles.
True
TRUE or FALSE: Objects within a closed system can exert forces on one another, but objects and forces cannot leave or enter the system.
True
Calculate momentum: A 700-gram bird flying at a velocity of 2.5 m/s.
1.75 kg*m/s
Calculate momentum: A 300-kg roller coaster traveling at 25 m/s.
7500 kg*m/s
TRUE or FALSE: All action-reaction forces produce motion.
False
TRUE or FALSE: The greater the mass of an object, the stronger its gravitational force.
True
Calculate momentum: A 40-kg shopping cart rolling along at 0.5 m/s.
20 kg*m/s
Name the only two forces that can both attract and repel.
electric and magnetic forces
TRUE or FALSE: Forces always exist in pairs.
True
TRUE or FALSE: Gravity is the weakest universal force, but it is the most effective force over long distances.
True
Which of the following factors affect the momentum of a moving object: mass, volume, shape, velocity
mass and velocity
TRUE or FALSE: An object with a small mass can have a large momentum if the object is traveling at a high speed.
True
What is the momentum formula, including the correct units?
momentum (kg*m/s) = mass (kg) * velocity (m/s)
The sun's mass is much greater than the mass of the Earth, so the sun's gravitational force is much ____ than that of Earth.
stronger
TRUE or FALSE: Action-reaction forces never cancel.
True (because they work on different objects!)
If two identical objects are moving at different velocities, the object that is moving faster will have _________ momentum.
greater/more
According to Newton's 3rd law of motion, what happens whenever one object exerts a force on a second object?
The second object exerts an equal and opposite force on the first object.
What is the momentum of the ball at one second?
2.5 kg*m/s
TRUE or FALSE: The gravitational pull of the moon is the primary cause of Earth's ocean tides.
True
The gravitational force of attraction between two objects depends on ____ and _____.
mass and distance
Objects with like charges ____ one another, and objects with opposite charges ____ one another.
repel, attract
TRUE or FALSE: Action-reaction forces do not cancel each other out because the action force is always greater than the reaction force.
False
TRUE or FALSE: Newton's 2nd law describes action-reaction forces.
False
TRUE or FALSE: The farther apart two objects are, the weaker the gravitational force.
True
Your in-line skates are sitting in a box on a self in the closet. What is their momentum?
zero
What does conservation of momentum mean?
If not net force acts upon a system, the total momentum of the system does not change.
Calculate momentum: A 1000-kg car traveling at 5 m/s.
5000 kg*m/s
The equal and opposite forces described by Newton's 3rd law are called _____ and _____ force.
action, reaction
TRUE or FALSE: The closer two objects are to one another, the weaker the gravitational force.
False
What is the SPEED of the ball at 0.5 seconds?
5 m/s
TRUE or FALSE: Earth's gravitational force is stronger than the gravitational force of the sun.
False