Post on 28-Dec-2015
1
Classical PhysicsYear 10 Pathway C
Mr. D. Patterson
2
Describe forces as a push or a pull that can change an objects velocity or shape
State Newton’s First Law
Describe the concept of inertia
Outcomes
3
A force is a push or pull which may:◦ A) Change the shape of an object◦ B) Change the velocity of an object
May the force be with you
ForceForce
4
A force is a vector: it has magnitude and direction
The magnitude of the force is measured in Newtons (N)
May the force be with you
40 N left10 N Down
5
Forces can occur even without contact
Contact and Non Contact
Newton’s Laws
Sir Isaac Newton was a mathematician and physicist in the early 18th Century
Newton developed “three laws” of motion which described how objects move
Newton’s first law Newton’s first law of motion:An object at rest stays at rest and an object
in motion stays in motion with the same speed.....
unless acted on by an unbalanced force.
No unbalanced forces.
Rock stays at rest.
No unbalanced forces.
Ice skater continues with constant speed
8
These object have inertia
Inertia is the tendency to not change motion
Inertia
9
Newton’s First law
Force Force
10
Newton’s First Law
Force
Stops pulling
Example A car is travelling at 100km/h when it
crashes into a barricade coming to a complete stop. The driver is wearing a seatbelt but his passenger is not.
Explain each persons motion during the crash using Newton’s first law of motion
Key words: force, rest, unbalanced, inertia
12
Describe forces as a push or a pull that can change an objects velocity or shape
State Newton’s First Law
Describe the concept of inertia
Outcomes