Physics presentation

You can tell that an object has moved when its __________ has changed.

position

frame of

reference

The object used for comparing another object to describe its position is called a…

The distance an object moves in a certain amount of time is called _________.speed

A ______ graph can be used to show the change in an object’s speed over time.

line

Line Graph

What makes objects change speed ,direction ,shape etc.?

What unit is used to measure forces?

Yum!!!

Not that kind!

!

What is a force between surfaces that slows or stops objects?

heat

Friction creates ______.

NEWTON’S FIRST LAW OF MOTION

When an object is in motion it tends to

stay ...

Unless an external force act on it

When an object is rest it tends to remain at...

This is called…

GALILEO'S EXPERIMENTS WITH

ROLLING BALLS DOWN INCLINED

PLANES

Galileo continued to refine his ideas about objects in motion. He took a

board 12 cubits long and half a cubit wide (about 20 feet by 10 inches) and cut a groove, as straight and smooth

as possible, down the center. He inclined the plane and rolled brass balls down it, timing their descent with a water clock — a large vessel

that emptied through a thin tube into a glass. After each run he would weigh

the water that had flowed out — his measurement of elapsed time — and compare it with the distance the ball

had traveled.

Aristotle would have predicted that the velocity of a rolling ball was

constant: double its time in transit and you would double the distance it traversed. Galileo was able to show

that the distance is actually proportional to the square of the

time: Double it and the ball would go four times as far. The reason is that it

is being constantly accelerated by gravity.

 

The use of a force to move an object is called________.

work

The ability to do work is

called _________.

energy

kinetic

The energy in

motion is __________ energy.

What we have learnt

Force makes an object change shape, speed, direction, etc.

Friction is the force between surfaces

that slows or stops objects.

A line graph can be used to show the change in an

object’s speed over time.

Friction creates heat.You can tell that an object has moved when its position

has changed.The use of a force to move an object is called work.

The ability to do work is called energy.

The energy in motion is kinetic energy.

Newton unit is used to measure forces.

Newton’s First Law of Motion – If an object is at

rest it remains at rest and if an object is in motion it remains in

motion unless an external force act on it

Made by – Gulshan Singh