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# Midterm Flashcards

terminus

 As an object falls freely in a vacuum (w/o air resistance) its
definition

 velocity increases
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 In the absence of air resistance, the objects fall at a constant
Definition

 acceleration
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 A ball is thrown up and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be
definition

 the same as the speed when first released
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 Suppose an object is in free fall. Each second the object falls
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 a larger distance than the in the second before.
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 If you have drop a feather and coin in an air-filled tube, which hits the ground first?
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 the coin
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 When a basketball player jumps to make a shot, once his feet are off the ground, the jumper’s acceleration…
definition

 is “g”. No more or les
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 A ball is thrown straight up. The top of its path, the instantaneous speed is
definition

 0 m/s
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 When something falls it accelerates. The acceleration is called the acceleration due to gravity and is symbolized by “g” and it is…
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 9.8 m/s
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 If a free falling object were equipt with a speedometer, its speed reading would increase by about ___ seconds
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 10
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 If a ball were equipt with a speedometer on a planet where the acceleration due to gravity is 23 m/s, the reading on the speedometer would increase each second by
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 23 m/s
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 A freely falling object starts from rest and after falling for 6 seconds it will have a speed of about
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 60 m/s
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 If you drop a feather and a coin in a vacuum tube which will reach the bottom first?
definition

 neither- they will land at the same time
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 When you drop an object you can assume that the _________ of the object is zero when using kinematics equations.
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 initial velocity
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 Acceleration is defined as a a change in
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 velocity divided by time
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 Suppose that a car changes from 35 m/s to 40 m/s in one second and from 40m/s to 45 m/s in the second second… what is the accleration
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 5 m/hxs
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 the horizontal component of a projectile’s velocity is independent of
definition

 the vertical component
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 a ball is launched horizontally in and hits the ground in .8 seconds. If it had been launched with a much higher speed in the same direction, it would have hit the ground in…
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 .8 seconds
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 The time the projectile is in the air is called
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 flight time
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 In the absence of air friction, the horizontal component of a projectile’s velocity doesnt change as the projectile movesSometimes, Always, or Never true?
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 Always true
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 A cannonball is launched from the ground at an angle of 30 degrees above the horizontal and a speed of 30 m/s. Ideally (no air resistance) the ball will land on the ground with a speed of
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 30 m/s
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 In the absence of air friction, the vertical component of a projectile’s velocity doesnt change as the projectile moves sometimes, always, or never true?
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 Always
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 What is an example of something that is not a projectile?
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 a cannonball rolling down a hill
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 What angle produces the same distance as 75 degrees?
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 15 degrees
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 the highest position the projectile reaches is known as its
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 maximum height
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 A ball is thrown up into the air and at the top the velocity is entirely
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 horizontal
Term

 At the instant a ball is thrown horizontally, another ball is dropped at the same height. Which ball hits the ground first?
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 hits at the same time
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 A cannonball is launched horizontally from a tower. If the cannonball has a velocity of 60 m/s, where will it be in 1 second
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 60 m down range
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 at what angle will the projectile go the furthest?
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 45 degrees
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 At what part of the path does a projectile have a minimum speed?
definition

 at the top of its path
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 the horizontal distance a projectile travels is also known as its
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 range
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 If a projectile is launched at an angle the shape of its trajectory will look like a
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 full parabola
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 The law of inertia state that an object
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 -will continue moving unless acted upon-will continue moving in a straight line unless acted upon -will be at rest unless acted upon
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 the law of inertia applies
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 to nonmoving and moving objects
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 a sheet of paper wont topple a container of milk because the milk carton has
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 inertia
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 One object has twice as much mass as another and the first object also has twice as much
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 inertia
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 Compared to its weight on earth, the WEIGHT of a 10 kg object on the moon will be
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 less
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 Compared to its weight on earth, the MASS of a 10 kg object on the moon will be
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 the same
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 the mass of a sheep that weighs 110N is (? kg)
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 11 kg
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 An object following a straight-line path at a constant path at a constant speed has ___ acceleration
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 zero
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 A girl whose weight is 500 N hangs from the middle of a bar supported by two vertical strands of rope. What is the tension in each strand?
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 250 N
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 Friction Force is a force that always acts
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 opposite to an object’s motion
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 Which has more mass a kg of feathers or a kg of iron
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 both have the same
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 An object on Earth is 30 N and an object on the moon is 30 N. Which has the greater mass?
definition

 moon one
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 When an object reaches terminal velocity, its acceleration is
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 0 m/s
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 Suppose a force of friction of an object on a level surface is 25 N. The applied force needed to accelerate the object should be
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 more than 25 N
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 A book weighs 4. When held at rest in your hands, the net force on the book is
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 0 N
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 An apple weighs 1 N. The Net Force (total force) on the apple when it is in free fall is
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 1 N
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 If you pull horizontally on a desk with a force of 250 N causing the desk to move at a constant velocity, the friction force must be
definition

 equal to 250 N
Term

 A Net Force on a cart doubles, what happens to its acceleration?
definition

 It doubles too.
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 Net Force=
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 total force
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