All members of your group must have the same answer on your whiteboard to earn points for a question.

Let’s Play!

Forces and Free Body Diagrams

Mass and Weight

Friction and

Springs

Equilibrium and

Vectors

Inertia

Newton’s 2nd and 3rd

Laws

200

300

400

500

Forces & FBD’s

Mass & Weight

Friction &

Springs

Equilibrium &

VectorsInertia

Newton’s 2nd and

3rd Laws

100

200

300

400

500

100

200

300

400

500

100

200

300

400

500

100

200

300

400

500

100

200

300

400

500

100

This is the FBD of an apple falling

from a tree.

Fg

This is a support force which

points perpendicular to

surfaces.

What is the normal force?

This is the FBD of a box sliding down a

ramp.

Fn

Fg

Ff

This is the FBD of a hockey puck sliding

across the ice (frictionless, no air

resistance).

Fn

Fg

This is the FBD of a fish in a bear’s

mouth.

Fp

FgFp

This quantity will not change if you go to the moon.

What is your mass?

This is the weight of a 10-kg object

on Earth.

What is about 100 N?

This is the mass of an object that has a weight of 981 N on Earth.

What is 100 kg?

A 2kg object has this weight on the

Moon.(g = 1.6 m/s2)

What is 3.2N?

An object is 30N on Earth. What is its weight on Jupiter?

(g = 26 m/s2)

What is 78N?

µ “mu” means this physically.

What is the “roughness” or

the “bumpiness” of a surface?

The spring constant “k”

physically describes this.

What is the “stretchiness” or “stiffness” of the

spring?

This line represents the coefficient of static friction.

Normal Force (N)

Fri

ctio

n F

orce

(N

)

A

B

What is line B? (because static

friction is ALWAYS greater

than kinetic)

A spring has an equilibrium length of

5 cm, and is stretched to 7.5 cm.

This is the displacement (∆x).

What is 2.5 cm?

A spring has a constant of 100 N/m.

If a 5kg mass is hung on it, then it will stretch this far from equilibrium.

What is 0.5m?

(T/F) An object in equilibrium

experiences no forces.

What is False.

This is the meaning of static

equilibrium.

What is stationary and balanced?

DailyDouble!

We are OPEN

If the sign has a mass of 50 kg, this is the tension is each cable.

What is 250N?

A vector has these two things.

What is a magnitude and a direction?

The resultant vector has this magnitude and direction.

40N

30N

50N

This is the measure of inertia.

What is mass?

This block has more inertia.

100 kg100 kg

20 m/s

What is… They both have the same interia?

Rank the following in order of least to greatest inertia.

10kg 5 kg 10kg

5 kg5 kg 7.5 kg

A B C

D E F

What isB=D=F, E, A=C?

Which object has the most inertia:1kg of feathers1kg of nails1kg of apples1kg of marshmallows

What is… All have the same?

A B C

D E F

Acceleration (m/s2)

For

ce (

N)

Acceleration (m/s2)F

orce

(N

)Acceleration (m/s2)

For

ce (

N)

Acceleration (m/s2)

For

ce (

N)

Acceleration (m/s2)

For

ce (

N)

Acceleration (m/s2)

For

ce (

N)

Rank the following force vs. acceleration graphs in order of least to greatest inertia.

EB=D

FA=C

If a person pushes on a wall with 10 N of force, the wall

pushes back on the person with this

much force.

What is 10 N?

This causes a mass to

accelerate.

What is a net or an unbalanced

force?

A 9.0-kg object experiences a net force of 12 N. This

is the acceleration.

What is 1.33 m/s2?

This is the mass of the box.

What is 5 kg?

DailyDouble!

This is the acceleration.

3 N8 N

6 N

2 kg

What is 3.9 m/s2?

FinalJeopardy

Friction

If the coefficient of static friction between a

crate and the floor is 0.25, how hard much

you push to start a 450-N crate moving?

What is 112.5 N?