# Physical Science Unit Study Guide

### 27 terms by kopenguin

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Includes all information for test on April 23rd EXCEPT DRAWINGS.

### Velocity

Speed with direction

### Momentum

Product of an object's mass and its velocity.

### Balanced Force

Net force on object equals zero.

### Unbalanced Force

Net force does NOT equal zero.

### Friction

Force of 2 objects, in contact, that oppose movement of the other.

### Gravity

Force of attraction between 2 objects.

### Inertia

Tendency of an object to remain at rest or in motion at a constant velocity.

### Free Fall

Motion of body when gravity is acting on it.

### Terminal Velocity

Maximum velocity reached by a falling object that occurs when the resistance of the medium is equal to the force due to gravity.

### A person walks 1000 meters in 15 minutes. What is the person's speed?

Speed = Distance/Time
1000/15= 66.67m/s

meters

kilograms

Liters

Kelvins

seconds

2.01 × 10 ⁴ m
1.4 × 10 ⁺⁶ g

5630000. µg
.010 kg

1. 7
2. 1
3. 4
4. 1
5. 6

Infinite

Applied Force

### What does Fg stand for?

Force due to Gravity

### What does Ff stand for?

Force due to Friction

Normal force

Net force

### Review the elevator question. You must be able to label why something is positive (applied force) and something is negative (Opposite direction of the applied force).

FNET= -960 N (The force is negative because it is in the opposite direction of the motion of the system. Think about this. The elevator is going up. The opposite of up is down. That is the same as 215 pounds!)

### Explain what is wrong with the following sentence: A man walked at a velocity of 12 m/s.

There is no direction.

### A girl participating in cross-country spends the afternoon practicing, and ends the practice completely tired from her hard work, despite the fact that her average velocity during the practice was 0.0 m/s. Explain how this situation is possible.

She ran back to where she started, so technically there was no displacement.

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