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Phys/Chem semester 1
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Gravity
Terms in this set (29)
Speed is
Measure of how fast something is moving, the distance covered per time unit, and always measured in terms of a unit of distance divided by a unit of time
One possible unit of speed is
miles per hour, light years per century and kilometers per hour
When you look at a speedometer in a moving car, you can see the cars
Instantaneous speed
Suppose you take a trip that covers 240 km and takes 4 hours to make. Your average speed is
60 km/h
Acceleration is defined as the change in
Velocity divided by the time interval
Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 mph. What is NOT true?
Your velocity is constant
A ball is thrown straight up. At the top of its path its instantaneous speed is...
0 m/s
A ball is thrown straight up. At the top of its path it's acceleration is...
About 10 m/s
An object travels 8 meters in the first second of travel, 8 meters again during the second second of travel, and 8 meters again during the third second. It's acceleration is....
0 m/s squared
If a freely falling object were somehow equipped with a speedometer it's speed reading would increase each second by..
About 10 m/s squared
If an object were equipped with a speedometer and allowed to fall freely on a planet where the acceleration due to gravity by 20 m/s the speedometer would increase each second by...
20 m/s
10 seconds after starting from rest a freely falling object will have a speed of about
100 m/s
One half second after starting from rest, a freely falling object will have a speed of about
5 m/s
The astronomer Copernicus was the first person to publicly state that the earth
Revolves around the sun
Galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane?
To nearly the same height as where it originally started
The law of inertia states
At rest will remain at rest, will continue moving at the same velocity, or continue moving in a straight line unless acted upon by an outside force
The law of inertia applies to
both moving and nonmoving objects
After a common ball is fired into frictionless space, the amount of force needed to keep it going equals..
The same amount of force with which it was fired
Which had more mass? A kilogram of feathers or a kilogram of iron
Neither- they both have the same mass
A kilogram of feathers and a kilogram of iron have the same volume. This statement is...
Never true
One object had twice as much mass as another. The first object also has twice as much
Inertia
Compared to its weight on earth a 10-kg object on the moon will weigh
Less
It is just as hard to push a car on the moon as it is to on earth. This is because
The mass of the car is independent of gravity
Compared to its mass on earth, the mass of a 10-kg object on the moon is
More
The force required to maintain an object at a constant speed in free space (no friction) is equal to
Zero
Friction...
Acts in a direction that opposes the motion of an object, comes from a Microscope bumps that act as obstructions to the objects motion, is the name given to the force acting between surfaces sliding past one another
A 10-n force and a 30-n force act in the same direction on an object. What is the net force on the object
40 N
Accelerations are produced by
Forced
If the force acting on a cart doubles, what happens to the carts acceleration?
It doubles
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