How Fast?!
The formula for speed is......
Speed = Distance / Time (distance divided by time)
A force is a ________ or ________ on an object.
Push or pull
1. _______ is energy of motion.
2. _______ is energy that is NOT moving
1. Kinetic Energy
2. Potential Energy
How many different simple machines did we talk about in our notes on Monday?
6
This is the name for the lines that make up the border of a graph.
Bonus: What label goes on the horizontal line?
Axis
Time goes on the x axis (horizontal axis)
True or False: the units for speed is time over distance
ex: 5s/m
FALSE: it is distance over time (5m/s)
TRUE.
What 2 factors affect (change) the amount of potential energy?
1. Mass of the object
2. Height of the object
A car, a wagon, and a bike are examples of this type of simple machine.
Wheel and Axle
a device that reduces the amount of force needed to move an object
Simple Machine
Distance = 32ft
Time = 1s
Speed = ____________
32ft/s
Pulls - gravity always pulls "down" on an object.
In a hydroelectric dam, where would the water have the MOST potential energy?
A. At the very top
B. In the middle
C. At the very bottom
A. At the very top. Why?
True or False: Simple machines change the amount of work done by an object.
FALSE: The amount of work stays the same, but you can use less force.
a unit used to measure force
Newton
Who is going faster?
Person A: 100m in 5s
Person B: 100m in 10s
Person A: Speed is 20m/s******
Person B: Speed is 10m/s
A hot air balloon floats after being inflated with air. What type of force does this describe?
Unbalanced force.
Which answer describes kinetic energy?
A. A boy standing on a diving board
B. A girl holding a volley ball
C. An archer holding a bow.
D. An arrow that is flying in the air
D
__________ is the ability to do work.
Energy
a group of interacting, interrelated, or interdependent parts forming a more complex whole
System
Distance = 4m
Time = 10 seconds
Speed = ____________
0.4m/s
Mrs. Brem pushes on a wall with a force of 20N, but the wall does NOT move. What force is the wall also pushing back onto Mrs. Brem with?
20N - it is a balanced force because nothing moves.
A car rolls 23cm with a strong push
A car rolls 17cm with a medium push.
About how far will a car roll on another medium push and why?
17cm because ......
The stronger the push, the farther the car will go.
The weaker the push, the less distance the car will travel.
What is the formula for work?
*You'll see this formula in your Gizmo today*
Work = force x distance
energy cannot be created or destroyed; it only changes from one type of energy into a different type
Law of Conservation of Energy