Frictional force and Terminal Velocity Flashcards Preview

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Flashcards in Frictional force and Terminal Velocity Deck (17):
1

If an object has no force propelling it, what will happen?

It will always slow down and stop because of friction

2

Friction always acts in the [ ] direction to movement

Opposite

3

To travel at a steady speed, the [ ] needs to [ ] the frictional forces

driving force
balance

4

When do you get friction?

Between two surfaces in contact or when an object passes through a fluid (drag)

5

What is drag?

Friction when an object passes through fluids (liquid or air)

6

Most of the resistive forces, in fluids are cause by [ ]

Air resistance

7

What is the most important factor in reducing drag in fluids?

Keeping the shape of the object streamlined

8

What is he best way of creating drag in a fluid?

A parachute

9

Drag increases as [ ] increases

speed

10

[ ] increases as speed increases in a fluid

Frictional forces

11

What do objects falling through fluids reach?

A terminal velocity

12

When falling objects first set off, the force of [ ] is [ ] than the frictional force slowing them down, so they [ ]

gravity
much more
accelerate

13

As the speed of the object falling increases ...
What does this do?

...The friction builds up
This gradually reduces the acceleration until the frictional force is equal to the accelerating force and then it won't accelerate any more = terminal velocity

14

What is terminal velocity?

The maximum speed of an object where the frictional force is equal to the gravitational force

15

What does the terminal velocity of a falling object depend on?

Shape and area

16

What is the accelerating force acting on all falling objects?

Gravity

17

If there was no air resistance, all objects would fall at...

the same Rate