Final Exam Flashcards
The unit of acceleration in SI is
M/s^2
What is the result of a net force of 2 newtons that acts on a mass of 1 kg on a frictionless table?
It will accelerate at a rate of 2m/s^2
The term “at rest” means
Not moving
Acceleration should be defined as the
Change in velocity per unit of time
An object travels 8.0meters in the first second of travel, 8.0 meters again during the next second of travel and 8.0 meters again during the third second. It’s rate of acceleration is
0.0m/s^2
For our everyday events, our frame of reference for motion is usually
The earth
The same force is exerted on four balls of the same size, but different masses. A = 1kg B = 2kg C = 3kg D = 4kg. Which ball would have the greatest acceleration?
Ball A
The change in position of an object is that objects
Displacement
The property of objects to resist any change in their state of motion is called
Inertia
A push or pull is a
Force
What happens to the mass of an object if it is take from earth to the moon?
It remains the same
The SI unit of force is the
Newton
An object is dropped and is in free fall, Each second the object falls:
A greater distance than in the second before
The velocity of an object when the clock reading is zero at the beginning of an experiment is the
Initial velocity
The distance an object travels divided by the time it takes for it to go that distance is
Average speed
The horizontal and vertical velocities of a projectile are
Independent of each other
If a projectile could be launched in a perfect vacuum, it would travel the greatest horizontal distance if it is launched at an angle of ____ to the ground.
45 degrees
A baseball is thrown from the shortstop to the first baseman. When the ball leaves the shortstops’.a hand it has a horizontal velocity of 20m/s. Since there is air resistance, how fast would the ball be going when the first baseman catches it?
Less than 20m/s
The object attached to the string is being swung in a clockwise circular path as shown at the right. Assume the string breaks where the ball is positioned at the top. In which direction will the object be traveling an instant later.
The direction of the ball (in this case upward diagonal to the right)
If an object was thrown at at 30 degree angle with respect to the surface of the moon (where there is no air), it’s horizontal velocity after leaving the astronauts gloved hand would
Stay the same
A vector has
Both magnitude and direction
An arrow is shot upward into the air at a 60 degree angle to the ground. At the very top of the arrows path:
It has no vertical velocity, but has horizontal velocity
At what point does a projectile that was launched at some angle to the ground have the least overall velocity?
After half of its total time of flight
A box is resting of the floor. Someone begins pushing on the box, but it does not budge. More force is applied and finally the box begins to move. After it starts moving , what does the person notice?
That static friction is greater than kinetic friction
Some kid eats a whole peach and spits he pit straight out of his mouth from a second floor window. The pit woulda wits overall minimum velocity:
Just as it is spit out
