AP Friction

Presentation

•

Physics

•

9th Grade - University

•

Easy

•

NGSS

HS-PS2-1, HS-PS2-4

Standards-aligned

Caroline Marshall

Used 2+ times

FREE Resource

5 Slides • 22 Questions

AP Friction

by Marshall

What is Friction

the resistance that one surface or object encounters when moving over another.
You can have static friction and kinetic friction

Static Friction

Static friction can prevent an object from sliding down a sloped surface.
The coefficient of static friction, typically denoted as μs, is usually higher than the coefficient of kinetic friction.
note the equation in green

Kinetic Friction

Kinetic friction is defined as a force that acts between moving surfaces.
A body moving on the surface experiences a force in the opposite direction of its movement.
note the equation in green

Multiple Choice

Friction is a force that acts in an ___________ direction of movement.

similar

opposite

parallel

north

Multiple Choice

What type of friction is not moving?

static

sliding

fluid

rolling

Multiple Choice

Rougher surfaces have ...

greater friction

less friction

the same level of friction

Multiple Choice

If you have the following Forces: F_N=100N, F_f=20N . What is the coefficent of friction?

μ=5.0

μ=0.2

μ=1.2

μ=0.1

Multiple Choice

What is the force of friction between a block of ice that weighs 950 N and the ground if μ = .12?

65 N

226 N

175 N

114 N

Multiple Choice

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N?

0.78

0.51

0.78 N

0.58 N

Multiple Choice

Which would NOT be a way of reducing friction?

making the surfaces smoother

using lubricants such as waxes, oils, or grease

changing from sliding friction to rolling friction using ball bearings

Using kitty litter on snow and ice to help your car gain traction

Finding Friction using the Normal [Real] force

When a system is balanced the Normal force and Gravity Force are equal
When a system is balanced the Friction and applied force are equal
A balanced system means that the object is at rest, or moving at a constant velocity [no acceleration]

Multiple Choice

When looking at friction problems, if the net force in the x-direction on an object is zero, what can we say about its acceleration?

it is positive

it is negative

it is zero

not enough information is given

Multiple Choice

Normal force is

Always opposite the weight

Always parallel and down the incline

Always perpendicular to the surface

It depends on the direction of motion

Multiple Choice

Calculate the resultant force.

60N, Left

40N, Right

60N, Right

Multiple Choice

These forces are...

Balanced

Unbalanced

Multiple Choice

These forces are...

Balanced

Unbalanced

Multiple Choice

Based on the information in the diagram, what is the net force acting on this object?

12 N downward

4 N upward

4 N downward

8 N to the left

Multiple Choice

If an object's mass is 30 Kg on the Earth, what would be it's weight on Earth?

30 N

300 kg

3000N

300 N

Multiple Choice

If the weight of a body on the Earth's surface is 600 N, what would be it's weight on moon? (Hint: The earth is six times bigger than the moon)

3600 N

100 N

6000 N

200 N

Multiple Choice

Calculate the Net force experienced by the object shown below

20 N

14.4 N

4 N

10 N

Multiple Choice

Which force diagram best represents the forces acting on the box?

Multiple Choice

Which force diagram best represents the forces acting on the box?

Multiple Choice

If there are two forces going in the SAME direction, you would ...?

(-) Subtract the forces

(+) Add the forces

Neither

(x) Multiply

Multiple Choice

A 267.5 N force is applied to slide a chair across the room, causing an acceleration of 4.2 m/s². What is the mass of the chair?

26.75 kg

63.69 kg

263.3 kg

1123.5 kg

AP Friction

by Marshall

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