QUIZ #3: Newton's Law of Motion

Fg or ___

Weight, also known as the Force of Gravity

Fg =

Force due to gravity

Fn =

normal force

Ffr =

Friction Force

Fa =

Applied Force

Ft =

Force of tension

Net force is the _____ force.

leftover

Net force is calculated by, in other words, ______.

Winners - Losers
(minus)

A free body diagram (FBD) is a visual representation of all the ________ acting on an object.

external forces

We draw a _________ to represent an object in a free body diagram.

dot or box

The unit for force is _____.

N (newtons)

The unit for Weight or Fg is _____.

N (newtons)

Instead of using the word a "linear" to describe a pattern, we are enhancing our vocab to use the word:

directly proportional

These forces are…

balanced

If an object experiences an acceleration, the forces must be __________.

unbalanced

If an object experiences constant velocity, the forces are ________.

balanced

These forces are…

unbalanced

If an object was not moving at constant velocity, the forces are ________.

Describe the graph’s (1) slope, (2) velocity, and (3) acceleration.

slope = 0; object is not accelerating

Describe the graph’s (1) slope, (2) velocity, and (3) acceleration.

slope = positive; velocity is increasing and accelerating positively

Describe the graph’s (1) slope, (2) velocity, and (3) acceleration.

slope = negative; velocity is decreasing and accelerating negatively

Newton's third law states that for every action force there is an ______ & ______ reaction force.

equal and opposite

When writing an action-reaction force pair, you need to include:

2 objects and directions

Finish this action-rection force pair: "hammer hits nail down" so...

nail hits hammer up

Action-Reaction force pairs are equal in...

magnitude (amount) and time

Action-Reaction force pairs are opposite in...

direction

A finger presses a doorbell button. Which pushes harder?

neither, same force!

A car collides with a bug. Why does the bug accelerate so much more than the car?

bug has less mass leading to more acceleration

ACTION: Earth pulling down on an apple
REACTION: ___________

The apple pulling up on the Earth.

The object for the force of gravity is _______.

Earth

Tension is always a _____.

pull

______ is the pulling force transmitted by a strong cable, chain, or rope.

Tension

The direction of tension is always _______.

away