Using Machines Notes

Daily Warm-Up:

Open Ended

Calculate the potential energy for a 2kg basketball dropping from a height of 3.5 meters with a velocity of 9.8m/s2. 

Find the PE in Joules? 

Open Ended

What is the kinetic energy of a 10 kilogram cannon ball traveling at 50 meters per second?

Open Ended

A ski jumper moving down the hill had a Potential Energy of 10,500 Joules, and a Kinetic Energy of 6,500 Joules. 

What is her Mechanical Energy?

Open Ended

How much work is done on a small car if a 3150 N force is exerted to move it 75.5 m to the side of the road?

Open Ended

If it takes 50 seconds to lift 10 Newtons of books to a height of 7 meters, calculate the power required.

Q: What are some
machines we use
everyday to help
make doing work easier?

​Using Machines

Machines

A machine is a device that makes doing work easier.

Machines make work easier by increasing the force that can be applied to an object.

WRITE!

Machines & Forces

Two forces are involved when machine does work: INPUT and OUTPUT!

➢

Input Force is the force applied to the machine.

➢

Output Force is the force applied by the machine.

Dropdown

Force that is applied to the machine is called

Select answer

and the force applied by the machine is called ​

Select answer

.

WRITE!

Mechanical Advantage is the ratio
of the output force to the input
force!

Mechanical Advantage

WRITE!

Efficiency

Efficiency is the measure of how much work you put into a machine and is
changed into useful output work by the machine.

Machines can be made more efficient by reducing friction working against
it!

Multiple Choice

How can we make machines more efficient?

• Reducing friction working against them

• Increase manual labor
• Use outdated technology

• Ignore maintenance and updates

WRITE!