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Gravity and Projectiles

Potpourri Newton’s 1st Newton’s 2nd Newton’s 3rd

Why is it important that a satellite be above earth’s atmosphere?

So it won’t encounter air resistance

At what angle should a slingshot be oriented to achieve maximum distance?

45 degrees

What is the acceleration of Gravity?(Rounded to the nearest tenth)

9.8 m/s

A ball is thrown straight up at 30m/s, about how long will it be in the air?

6 seconds

Given d=1/2at2 How far will an object

have fallen if it was dropped from a plane 16

seconds ago?

480m

The kilogram is a measure of an object’s:

Mass

This gives you both the magnitude and direction of velocity

What is a velocity vector?

This force ensures that an object, whether rolled orthrown will always come to a stop.

What is friction?

Who is the coolest teacher ever?

Mr. Coffeen

How much does one kilogram weigh in Newtons?

9.8N or 10N

This is the force that is explained by

Newton’s First Law

What is inertia?

Inertia applies to bodies at rest and:

Bodies in constant motion

If a body has twice the inertia of another body, it also has twice the_____

Mass of the other body

A large man and a small woman are on a train that makes a sudden stop.

The woman falls forward but the man keeps his footing. Who had more

inertia?

The large man

Does a bowling ball have more inertia on the Earth or

on the Moon?

The same both places

What equation do we use to describe Newton’s Second Law?

F=ma

10kg brick and a 1kg brick are dropped in a

vacuum, the force of gravity on the 10kg brick is:

10 times as much

An object is pulled northward at 20N and southward at 15N.

What magnitude of the net force?

5N

A 1000kg truck is accelerated at 8m/s/s, how much force was applied to do so?

8000N

Convert this equation into the force gravity exerts on earth: F=ma

F=gaOr

F=10aOr

F=9.8a

Paraphrase Newton’s Third Law

Every action has an equal and opposite reaction

A high school student hits a nail with a hammer. During the collision there is a force on which object?

Both nail and hammer

A boxer swings as hard as he can at a helium balloon then equally hard at a punching bag.

Which object did he hit with more force?

The punching bag

An archer shoots an arrow. Consider the action force to be

the bowstring pushing against the arrow. The reaction force is:

The arrow pushing against the bowstring

A rocket is able to propel

itself in in the vacuum of

space by firing its engines. The force

that propels the rocket is:

The exhaust gasses rushing away from the ship