Flashcards in Chapter 20 Vocab Deck (20)

1

## Newton's 2nd law of motion

### "The acceleration of an object depends on the mass of the object and the amount of force applied"

2

## Newton's 3rd law of motion

### "Whenever one object exerts a force on a second object. The second object exerts an equal and opposite force on the first."

3

## Free fall

### the motion of a body when only the force of gravity is acting on the body

4

## Projectile motion

###
The curved path that an object follows when thrown launched, or otherwise projected near the surface of Earth

5

## Intertia

### the tendency of an object to resist being moved or if the object is moving to resist a change in speed or direction until an outside force acts on the object.

6

## Momentum

### a quantity defined as the product of the mass and velocity of an object.

7

## Newton's 1st law of motion

### "An object at rest remains at rest. And an object in motion remains in motion out constant speed and in a straight line unless acted on an unbalance force."

8

## Terminal velocity

### the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction

9

## Compound machine

### a machine made of more that one simple machine

10

## Screw

### a simple machine that consists of an inclined plane wrapped around a cylinder

11

## Wedge

### a simple machine that is made up of two inclined planes and that moves; often used for cutting

12

## Wheel and axles

###
a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the 2 circular objects

13

## Pulley

###
a simple machine that consists of a wheel over which a rope, chain, or wire passes

14

## Lever

### a simple machine that consists of a bar that pivots at a fixed point called a fulcrum

15

## Watt

### the unit used to express power; equivalent to joules per second

16

## Machine

### a device that helps do work by either overcoming a force or changing the direction of the applied force

17

## Power

###
the rate at which work is done or energy is transformed.

18

## Joule

### the unit used to express energy; equivalent to the amount of work done by a force of 1 N acting through a distance of 1 meter in the direction of the force.

19

## Work

### the transfer of energy to an object by using a force that causes the object to move in the direction of the force

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