Physics Study Guide

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Mr. Buetel's Class

What is Newton's first law of motion?

An object in motion tends to stay in motion unless acted upon by an outside force. An object at rest tends to stay at rest unless acted upon by an outside force.

What is Newton's second law of motion?

Force = Mass x Acceleration

What is Newton's third law of motion?

Every action has an opposite and equal reaction.

What is a force?

A push or a pull

What is the unit for force?

The Newton

What is the net force of a 20 Newtons west, and 20 Newtons east?

Since the forces are in opposite directions, they subtract. Meaning 20 - 20 = 0 Newtons.

What is the net force of 10 Newton's west, and 15 Newtons west?

Since the forces are in the same direction they add. Meaning that 10 + 15 Newtons = 25 Newtons west.

If an object is changing velocity, what kind of force is being applied?

Unbalanced

If an object is not changing velocity (the net force is 0) what kind of force is being applied?

Balanced

Do moving fluids exert more or less pressure than surrounding fluids?

Less

Pressure always moves from high to low, or low to high?

High to low

What is the name of the effect that says faster moving fluids exert less pressure in an area?

The Bernoulli effect

True or False, the word fluid includes gas and liquids.

True

_______________ causes objects to slow down when they are rubbing against each other.

Friction

What is often a result of friction?

Heat

Mass x Velocity = momentum

80 kgv/t

Which of Newton's law best describes inertia?

The first

What is the velocity of an object that falls 50 meters in 5 seconds?

Distance/time—or 50/5 --- 10 meters/second.

What is a pendulum?

And object that swings back and forth with a regular cycle

What affects that frequency of a pendulum?

The length of the string

What is the frequency of an object that swings for 10 cycles in 2 seconds?

Frequency = cycle/sec. or 10/2 = 5 (Hertz is the unit)

What has less friction, ice or rubber?

Ice

In the rocket lab, a balloon pushed a rocket forward by releasing air in the other direction. Which of Newton's laws does this describe?

The third

All forces must include a what?

Magnitude and Direction

Momentum = ???

Mass x Velocity

Terminal Velocity = ???

The maximum speed an object can fall in an atmosphere

Who came up with the law of Displacement?

Archimedes

What is the density of water?

1

What is the formula for density?

Mass/Volume

An object sinks when...

Its density is MORE than the substance it is in

Weight = ???

Mass x Gravity

Volume = ???

the amount of space something takes up - metric system is in Liters

Mass = ???

the amount matter is in something - metric Grams

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