# Science 7, Physics Test

### 25 terms by 16doocha

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### Acceleration

The rate at which velocity changes- FInal Velocity-Initial Velocity/ CHange in Time

### Acceleration due to Gravity

If gravity is the only force acting on an object, then we find the object will accelerate at a rate of 9.8m/s2 down toward the center of the Earth (this is often rounded to 10m/s2).

### Acetic Acid

Vinegar, when mixed with Sodium Bicarbanate it creates C02, water, Sodium Acetate

Actual Mechanical Advantage shows how much the machine magnifies an input force taking into consideration the friction in the machine- Divide Force Output by Force Input

### Archimedes

Many war machines used in the defense of Syracuse, compound pulley systems, planetarium, water screw (possibly), water organ (possibly), burning mirrors (very unlikely).

### Dependent Variable

the outcome factor; the variable that may change in response to manipulations of the independent variable

### Energy

Energy is the capacity of a physical system to perform work

### Final Velocity

Velocity at Impact- (2) Average Velocity

### Force

The capacity to do work or cause physical change F=MA, Force= Mass (Acceleration)

### Friction

effort expended in rubbing one object against another

### Independent Variable

the experimental factor that is manipulated; the variable whose effect is being studied

### Isaac Newton

Created the Three Laws of Motion

### Joules

The amount of work, in units

### Mass

The weight of the object

### Mechanical Efficiency

The mechanical efficiency of a machine describes how well the machine converts work input into work output- Work Output/ Work Input(100), higher the percentage the better

### Momentum

The quantity of motion in an object- Mass (final velocity)

### Newtons

The unit of force required to accelerate a mass of one kilogram one meter per second per second

### Physics

The study of matter and energy and the interaction of the two

### Projectile

Any object propelled through space by the exertion of a force which ceases after launch.

### Reaction Time

The interval of time between application of a stimulus and detection of a response.

### Sodium Bicarbonate

Baking Soda, when mixed with Acid Acetic it creates C02, water, Sodium Acetate

### Trajectory

The path a moving object takes through space.

### Velocity

The rate of speed

H20

### Work

The transfer of energy

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