Force and Work
What's the formula for calculating force?
F = m x g
What simple machine changes the direction of the force when you pull on it?
Pulley
What is the formula for AMA?
AMA = input force / output force
What's the formula for IMA?
input distance / output distance
What is an example of a system that helps keep society organized?
Education system, healthcare system, transportation system, etc.
What's the formula for calculating work?
W = F x d
What simple machine has an effort arm and a load arm?
Lever
Between input force and output force, which one is also known as the effort and which one is also known as the load?
Input = effort
Output = load
Much of the input force put into a machine is converted to thermal energy through _______.
friction
Name a simple machine involved in a fork.
Lever, Wedge
What units are used to measure work?
Joules
What is the part of the lever that does not move?
Fulcrum
When you push a fridge up a ramp into a truck, what is the input force (effort)?
The force required to push the fridge up the ramp
When you use the back of a hammer to pull a nail out of a piece of wood, what is the input distance?
How far back you pull the hammer
How tall do you think is the tallest skateboard ramp in the world?
70m tall
A bag of rocks with a mass of 10 kg hangs from a spring scale. How much gravitational force pulls it downward?
10 x 9.8 = 98
Name the two simple machines that are actually just modified forms of an inclined plane.
Wedge, Screw
When you push a fridge up a ramp into a truck, what is the output force (load)?
The gravitational force (weight) acting on the fridge
When you use the back of a hammer to pull a nail out of a piece of wood, what is the output distance?
What’s the best way to remove a nail from a piece of wood?
The back end of a hammer
A robot pushes with 200 N of force to move a box 2 meters across the floor. How much work is done to move the box?
200 x 2 = 400
Name two simple machines involved in the mechanism of a wheelbarrow.
Lever, Wheel and Axle
You push a fridge up a ramp into the back of a truck. It takes 200 N to push the fridge up the ramp. The fridge has a force of gravity of 500 N acting upon it. What is the AMA of the ramp?
AMA = load/effort
500/200 = 2.5
You use the back of a hammer to pull a nail out of a piece of wood. You pull the hammer back 30 cm and the nail comes out 5 cm. What is the IMA of the hammer?
IMA = input distance / output distance
30/5 = 6
You walk into a room and a lightbulb is off. How could you tell if it was just on?
Touch it to see if it's hot