Forces in Equilibrium

Forces in Equilibrium

Review Wednesday​

April 27th, 2022

Zoom Expectations

• Microphones Muted & Cameras ON

• Active Participation in class

• Unmuting to answer

• Typing in chat (private or public message)

• Submitting Assignments

• Taking advantage of Office Hours

​

Open Ended

What artificial candy flavor best fits your personality and why?

We've covered 5 lessons so far...

Let's Review 🌞

​The following slides will contain various questions to see how we are doing with our Forces in Equilibrium Unit.

The questions could be multiple choice, fill-in-the-blank, or drawing.

​

The end will be a poll where you will evaluate how you are feeling about the concepts covered. ​

The Force Vector:

Lesson 1

Fill in the Blanks

For an object to be in equilibrium the net force acting on that object must be

.

Multiple Choice

Which statement describes a vector?

• It has magnitude but NO direction

• It has direction but NO magnitude

• It has both direction and magnitude

• It has constant magnitude but no direction

Multiple Choice

What is the unit used for force?

• Kilograms

• Newtons

• Meters

• Kilometers

Multiple Choice

The expression of a person's age as 15 years is an example of a(n) _____ quantity.

• component

• vector

• resultant

• scalar

Fill in the Blanks

What are the vector components of the vector in the image:

Free-Body Diagrams

Lesson 2

Multiple Choice

Name the missing force...

• weight force

• normal force

• frictional force

• tension force

Multiple Choice

Name the missing force...

• applied force

• weight force

• lift force

• normal force

Draw

Add the forces needed to complete the free body diagram (HINT 4 FORCES)

Multiple Choice

The force that keeps objects on top of surfaces instead of letting them "sink" into the surface is known as....

• static

• abnormal

• normal

• inertia

Spring Force

Lesson 3

Multiple Choice

When you stretch a rubber band, you are storing __________ energy. 

• kinetic 
• potential
• none of the above
• all of the above 

Multiple Choice

If F is force, k is spring constant and x is extension, Hooke's Law tells us that:

• F=k/x
• x=Fk
• k=Fx
• F=kx

Multiple Choice

A force of F=500 N is applied to extend a spring.  What is the displacement x of the spring if its spring constant is k= 540 N/m?

• 0.96 m
• 0.93 M
• 1.3 m
• 1.1 m

Multiple Choice

A spring has a spring constant of 330 N/m.  How far is the spring compressed if 150 N of force are used?

• 2.2 m
• 0.0014 m
• 5.0 m
• 0.45 m

Multiple Choice

The mathematical relationship between Force on a Spring and its change in length is...

• direct proportionality

• inverse proportionality

• an exponential

• no correlation

Friction

Lesson 4

Multiple Choice

What type of friction is not moving?

• static
• sliding
• fluid
• rolling

Multiple Choice

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

• similar
• opposite
• parallel
• west

Multiple Choice

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

Multiple Choice

Which of the following is an example of friction that is helpful?

• Brakes used on a bike
• Tires from a car on the road
• Tread on the bottom of your shoes
• All are examples that are helpful

Multiple Choice

How can friction be reduced?

• reduce the force acting between the 2 surfaces
• reduce the roughness of the 2 surfaces coming in contact
• use wax, grease or oil
• all of the above are ways of reducing friction

Multiple Choice

What type of Friction is displayed with a bowling ball?

• sliding
• rolling
• static
• There is no friction

Poll

How are you feeling about our Forces in Equilibrium Unit?