Unbalanced and Balanced Forces
The Force that resists motion.
Friction
What 2 things do all forces have?
strength and direction.
What is resistance to motion called?
Friction
Which of these materials is magnetic?
A) copper B) plastic
C) aluminium foil D) Iron
D) Iron
What is gravity?
Gravity is a force that pulls things down.
A hammer coming down on a nail would be an ____________ force.
unbalanced
What is a force?
a push or a pull on an object created by its interaction with another object.
Which of these increases the friction of someone walking on the floor?
A) Sand paper B) Grease
C) Oil D) Banana peel
A) Sand paper
If Opposite poles (N and S) of a magnet are placed near each other, what happens?
If Similar poles ( N and N) of a magnet are placed near each other, what happens?
Attract (Opposites attract)
Repel (Same repel)
Who discovered Gravity?
Sir Isaac Newton
Josh pushed with 10 N of force an object that was 20Kg , He was exhausted.
0.5 m/s2 Ha ha
Jordan throws a football poorly it's Vi is 6m/s and travel for 4 seconds it's acceleration was a laughable 2 m/s2
What was his Vf
4m/s
What is a force that repels without touching
Electromagnetic
True or False?
Magnets need to touch something to apply a force?
False because they are a non-contact force.
What did Sir Isaac Newton say about gravity?
(Newton's Law of Gravity)
What goes up must come down.
Cris ran very fast at an acceleration of 5m/s2, he is 40 kg
200N
What is the difference between contact and non-contact forces?
Contact forces are when two objects touch during the interaction.
Non-contact forces do not touch and can even repel from a distance.
What happens when you fall and you reach termina velocity
Wind resistance stops you accelerating
What are the invisible lines surrounding a magnet called?
the magnetic field
What is the formula for Weight in Newtons?
What is gravity equal to?
N= M x A ( Newtons (Weight) ) = mass x gravity
Gravity = 9.8
Your mom pushing a shopping cart would be an ___________ force.
unbalanced
What are the 4 frictions
Sliding rolling static and fluid
What is it called when one surface rubs against another?
friction
Why can neodymium magnets be dangerous?
They are very strong magnets and you can not turn them off once you turn on the magnetism element.
What would happen if we didn't have gravity?
We would float off into space.