Speed and Velocity
What is a vector quantity?
The tendency of an object to resist changes in its velocity.
What is inertia?
Of the four fundamental forces, this one is the weakest.
What is gravity?
The force necessary to make an object move in a circle.
What is centripetal force?
Name the four inner planets.
What are Mercury, Venus, Earth, and Mars?
A measurement that is described in ft/sec2.
What is acceleration?
_____?_____ = Mass x Acceleration
What is Force?
The gravitational force between two objects is directly proportional to the ___________ of each object.
What is mass?
A fictional force that is actually due to inertia causing an object to move away from the center of a circle while spinning.
After Pluto lost its classification as a planet, what is it now called?
What is a dwarf planet?
The speed of a boat that travels 10 miles in 30 minutes? Please answer in miles per hour.
What is 20 mph?
The standard unit of force, defined as a kg x m/sec2.
What is a Newton?
The gravitational force between two objects is inversely proportional to the ____________ of the distance between those two objects.
What is square?
Centripetal force is _____________ to the velocity of the object.
What is perpendicular?
Name one thing that outer planets have in common.
The change in velocity divided by the change in time
What is acceleration?
Ignoring friction, what force is necessary to move a 30.0 kg object with an acceleration of 20 m/sec2 to the west? Don’t forget your units!
What is 30.0 x 20 = 600 kg x m/sec2 (Or 600 Newtons)?
The gravitational force between two objects is measured when the objects are 15 centimeters apart. If the distance between them is increased to 30 centimeters, how does the new gravitational attraction compare to the first one that was measured?
What is 1/4 of the original force? (OR 4 times less than the original force)
Distance increased by a factor or 2, so force will decrease by a factor of 22 or 4.
Velocity is _______________ to the curve of an object traveling in a circle.
What is tangential?
The reason a comet appears to have a fuzzy glow and a tail.
A sports car goes from a velocity of zero to a velocity of 18 m/sec east in 3 seconds. Name the acceleration of the car.
What is 6 m/sec2 east?
The ____________ frictional force is always greater than the kinetic frictional force.
What is Static frictional force?
The gravitational force between two objects (mass 1 = 5 kg, mass 2 = 8 kg) is measured when the objects are 10 cm apart. If the 5 kg mass is replaced with a 20 kg mass and the 8 kg mass is replaced with a 16 kg mass, how does the new gravitational force compare to the first one that was measured?
What is 8 times the original force?
Mass 1 increased by a factor of 4, mass 2 increased by a factor of 2. 4 x 2 = 8.
Using an example of sling shot, explain how an object would travel if released from its circular orbit. Why would it travel this way?
What is it would travel in a straight line, because the only force acting on it is in the direction of its velocity (which is in a tangential line to the curve of its prior motion).
Name the three stages of an asteroid that has intersected earth's orbit.
What are meteoroid (intersecting earth's orbit), meteor (traveling through earth's atmosphere), and meteorite (small pieces of the meteor that fall to earth)?
(Just the names are needed)