# physics midterm

### 57 terms by sopmac

#### Study  only

Flashcards Flashcards

Scatter Scatter

Scatter Scatter

## Create a new folder

millimeter

kilogram

precise

accurate

### the greek letter delta ▲ indicates a ____ the greek letter sigma Σ indicates _____

difference; change

m kg s

0

45°

### a golf ball is hit at an angle above the horizontal. what is the acceleration of the golf ball at the highest point in its trajectory? [neglect friction]

less than or equal to 9.8 m/s^2

### a ball is thrown from a high window. how far would you describe the acceleration of the ball during its fall?

falls slowly then gradually speeds up

### a ball is thrown horizontally from the top of a building with an initial velocity of 15m/p/s at the same instant, a second ball is dropped from the top of the building. the two balls have the same

acceleration and initial vertical velocity

### a projectile is launched horizontally from a cliff and eventually hits the ground below. assume the air resistance is negligible. how do the downward and horizontal components of the projectile's velocity behave during the motion

downward- increases horizontal- same

second

### acceleration due to gravity is also called

free fall acceleration

### the baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. at what point in the balls path does it experience zero velocity and nonzero acceleration at the same time

at the top of its trajectory

### what can be said about the displacement of objects of different masses falling with no air resistance

similar displacements and equal acceleration

### how does the velocity of objects that are falling toward earth change as they fall

it becomes greater

neither

### which would fall with greater acceleration in a vacuum, a leaf or a stone

neither same acceleration

scalar

vector

### what is an example of a vector quantity? what is an example of a scalar quantity?

velocity; temp vol mass

0m/s

### what is the motion of objects in two dimensions under the influence of gravity

projectile motion

### what is an example of projectile motion? what is not?

a baseball being hit; a jet lifting off a runway

### what increases and what stays the same as an object falls freely in a vacuum

velocity increases acceleration stays the same

a parabola

-9.8m/s^2

### the horizontal component of a projectiles velocity is independent of

the vertical component

air friction

### suppose you throw a ball straight upward. ignore air resistance. how would you describe the ball acceleration and velocity from the instant the ball leaves your hand until it reaches its highest peak

acceleration is constant velocity decreases

### th velocity of an object in free fall on the moon depends on

acceleration of gravity only

### what does a force do

starts stops or changes the state of a moving object

contact force

field force

inertia

### what is an example of a contact force? what is an example of a field force?

cf- friction normal tension ff- magnetic gravitational electrical

### a hammer drives a nail into a piece of wood. identify an action-reaction pair

hammer hits nail nail hits hammer

up Fair down Fn

0

### a leaf falls from a tree and lands on a sidewalk. identify an action-reaction pair

leaf pushes on sidewalk sidewalk pushes on leaf

third

### what are simultaneous equal but opposite forces resulting from the interaction of two objects

action-reaction pairs

weight

left

the same

less

weight

torque

### concerning the amount of torque produced what is true about the position of the force in relation to the axis of rotation

the closer to the axis the more force exerted

### the centripetal force is always directed ___________ in circular motion

towards the center

### where should a force be applied on a lever arm to produce the most torque

farthest from the axis of rotation

### if you want to open a swinging door with the least amount of force where should you push on the door

farthest away from the hinges

### if you cannot exert enough force to loosen a bolt with a wrench what should you do

use a longer wrench

### the force that seems to cause a rotating object to move away from the center of rotation is a result of the

inertia of object

1/4

### which has a greater linear speed: a horse near the outside of the rail of a merry-go-round or a horse near the inside rail? which has a greater angular speed?

outside; neither- same speed

Example: