Physics Review

Free Fall

100

What is acceleration for Free Fall? (don't forget units!)

a= 9.8 m/s^2

200

What can we assume about initial velocity in free fall problems?

vi= 0 m/s

300

If I say something is falling at 25 m/s downwards, am I talking about speed or velocity?

velocity because I also gave the direction

400

What is true about all objects in a vaccume?

They all fall at the same speed/velocity

500

Due to air resistance, what is true if we drop a feather and a brick from the same height at the same time?

They will have different velocities due to air resistance

Solving Free Fall

100

A child drops his toy from the house window and it falls to the ground in 2s. What is the acceleration?

a= 9.8 m/s^2 for all free fall problems

200

A construction worker drops a tool from the top of the building and it hits the ground after 3.5s. How tall is the building?

x= 60.03m

300

A construction worker accidentally drops a brick from a high scaffold. What is the velocity after 4s?

39 m/s downwards

400

Which equation will help you find distance from your kinetics equation list?

x= vi*t+ 1/2*a*t

Free Body Diagrams

100

How do we represent objects in a free body diagram?

Using a box

200

What is the units for Force?

Newtons

300

What do we call a force that results from a push or pull

Applied Force

400

What do we call a force that is perpendicular to the surface 

Normal Force

500

If a 12 kg box is sitting on top of a surface, what is the Force of gravity?

Fg= 117.6 N