Equations and Units
What is the unit for acceleration?
m/s/s
A rock is dropped straight down. Is it accelerating?
Yes
Mr. Boyer pushes a shopping cart down an aisle. What type of force is he putting into the cart?
Applied force
If the slope is 0 (the graph is flat). What is the object doing?
Not moving
What type of energy is stored in a battery?
Chemical
What is the formula for velocity?
v=d/t
What is the acceleration due to gravity on earth?
9.8 m/s/s
What type of force makes objects fall downward?
Gravitational
If the slope is negative the car is ____________.
Moving backwards
Newtons third law states that for every action there is a ______ and ______ reaction.
equal;opposite
What is the equation for force?
f=ma
A person walks in a straight line at a constant speed. What is their acceleration?
0 m/s/s
A 40 kg object experiences a total force of 200 N. What is its acceleration? Use F = ma
5 m/s/s
A man runs 50 meters from his house in 5 seconds, stops for 5 seconds, and then runs back to where he started in 10 seconds. Draw a position time graph to show this.
Answer to be assessed
Normal force
What is the equation for momentum?
p=mv
An elastic collision
A 50 kg object accelerates at 2 m/s/s. What is the total force on the object? Use F = ma
100N
It means that car two is traveling faster
A 145kg man goes to the moon. Does his mass change? Does his weight change?
Your mass does not changes. Your weight does.
What is the equation for kinetic and potential energy? What is the unit?
KE=1/2(m)(v^2)
PE=mgh
Unit=J
The forces on an object are balanced. Will it accelerate?
The forces are balanced meaning that the object will not accelerate.
An object falls at 8.2 m/s/s. What forces are acting on the object?
Gravitational and air resistance
If the graph is curved what is happening?
The object is accelerating
The "floaty boaty" boats