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# Physics Sem. Exam

What type of velocity of an object projected into the air is constant? vertical
What type of velocity of an object thrown into the air changes? horizontal
What is the maximum range of a projectile when projected into the air? forty-five degrees
The number of miles traveled is? distance
The change in displacement per unit of time is? velocity
The rate of change of velocity is? acceleration
Scalar units are what? magnitude
Vector units are what? magnitude and direction
The constant acceleration of an object in free fall is always? 9.8m/s^2
When no air is present all objects will fall at the same rate, what is known to do this? vacuum tube
The slope of a displacement-time graph equals what? velocity
The slope of a velocity-time graph equals what? acceleration
The area under a velocity-time graph equals what? displacement
The area under an acceleration-time graph equals what? velocity
The speed of an object thrown upward will what until they stop going up? decreases
Once the upward thrown object has stopped in the air it’s speed will begin to what on the way down at the same right? increases
Vertical and horizontal velocities are completely what of each other? independent
1 meter equals how many centimeters? one hundred
1 kilometer equals how many meters? one thousand
1 meter equals how many millimeters? one thousand
Which of Newton’s Laws of Motion says, for every action there is an equal and opposite reaction? third
Which of Newton’s Laws of Motion says, an object will remain in its present state of motion unless acted upon by an unbalanced force also called Inertia? first
Which of Newton’s Laws of Motion says, when an unbalanced force acts on an object it will accelerate in the direction of the force? second
What are the units used to measure force? newtons
What are the fundamental units that make up a newton? kilogram times meter per second squares
What 2 things does the force of gravity depend on between objects? mass and distance
With more space between the objects there is more or less force present that there would be if there was more mass? less
With more mass present than force then it will have more or less force than that of an object with less mass? more
The force of gravity on an object is also called? weight
If you weigh yourself in an elevator while it is accelerating upward, your weight appears to be what? more
If you weigh yourself in an elevator while it is accelerating downward, your weight appears to be what? less
If you weigh yourself in an elevator while it is in free-fall, your weight appears to be what? weightless
If you weigh yourself in an elevator while it is accelerating at a constant speed, your weight appears to be what? normal
Defined as the force on an object time the displacement of an object, measured in joules, is called? work
What are the fundamental units that make up a joule? newton times mass
Work done on an object divided by the time taken to do the work, measured in joules, is called? power
What are the fundamental units that make up a watt? joules per speed
The energy of motion, measured in joules, is called? kinetic energy
The energy of position that depends completely on the distance an object is the ground? potential energy
What is conserved during a collision? momentum
What must equal before and after a collision? total momentum
When the momentum changes in one object, the object it is acting on will have the same what? impulse
The attractive force between all objects directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers is called what? law of universal gravitation
Created by: Blondie1129