# Ms. Fedak's Class Scott Foresman Science Grade 5 Vocabulary Chapter 13

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Vocabulary

### Speed

Describes how far an object moves during a certain
amount of time (p. 408)

### Velocity

The speed and direction of an object's motion (p. 409)

### Force

A push or pull that acts on an object (p. 410)

### Magnetism

A force that pushes and pulls on other objects (p. 412)

### Electricity

An object is electrically charged when it gains or loses
electrons

### Friction

A contact force that resists the movement of one surface
past another surface (p. 414)

### Work

Energy used when a force moves an object (p. 416)

### Power

The rate at which work is done (p. 417)

### Equilibrium

The state in which the net force is zero (p. 419)

### Newton's First Law of Motion

An object at rest will stay at rest until another object
acts upon it, and an object moving in a straight line at a
constant speed will continue to move in a straight line at a
constant speed until a net force acts upon it (inertia)

### Inertia

The tendency of an object to resist a change in motion (p.
420)

### Newton's Second Law of Motion

Describes the relationship between acceleration (the rate
at which an object's velocity changes over time), mass, and
net force

### Acceleration

The rate at which the velocity of an object changes over
time (p. 422)

### Newton's Third Law of Motion

Every force has an equal and opposite reaction, and they
always occur in pairs

### Machine

A device that changes the direction or the amount of
effort needed to do work (p. 426)

### Simple Machine

Machines that only have a few parts - they make it easier
to do work

### Pulley

A kind of simple machine consisting of a rope that fits
onto a wheel and used to change the direction of a force
(p. 426)

### Wheel and Axle

A simple machine consisting of a wheel that revolves
around a post, or axis (p. 427)

### Lever

A type of simple machine consisting of a bar that turns on
a support called a fulcrum (p. 428)

### Inclined Plane

A form of simple machine consisting of a slanted surface
along which objects are easier to push upward than to lift
straight up (p. 429)

Example: