Flashcards
MYP 1 Forces PPT
Cards in this deck (17)
- 1What is Force? 1forces can’t be seen, but you can see what they do.
- 2What is Force?Force is an interaction that causes a change in motion – they can change speed, direction and shape of things.
Described by vectors (represented by arrows)
Vectors have magnitude (intensity) and direction
Unit of force: Newton - 3Types of ForcesApplied Force
Normal Force
Magnetic Force
Friction Force
Electrical Force
Gravitational Force - 4Applied ForceIs a force that is applied to an object by a person or another object.
Example: If a person is pushing a desk across the room, then there is an applied force acting upon the object. The applied force is the force exerted on the desk by the person. - 5Normal ForceIs the support force exerted upon an object that is in contact with another stable object.
Example: if a book is resting upon a surface, then the surface is exerting an upward force upon the book in order to support the weight of the book. - 6Magnetic ForceIs an attraction or repulsion that happens between electrically charged particles (protons and electrons) because of their motion.
It can appear in magnets or electromagnets. - 7Friction ForceIt’s the force two materials exert on each other.
It’s affected by the type of surface involved, an object’s mass AND how hard surfaces push together.
Friction always acts in a direction opposite to the direction of the object’s motion. - 8Gravity Force (Weight)It’s the attraction force between all matter.
It’s affected by the mass of the objects and their distances
The force of gravity on an object is called weight
Earth: acceleration caused by gravity = 9.8m/s2
Newton realized it is universal (Law of Universal Gravitation)
Force: mass x acceleration (F=ma → W=ma)
Escape velocity:
Earth = 11.2 km/s
Moon = 2.5 km/s
Jupiter 60 km/s - 9Massamount of matter => measure of body’s inertia
- 10Weighteffect of gravity on mass
Weight = mass x acceleration - 11BalancedIf the forces are balanced:
the object is stationary (at rest)
the object is moving at a constant speed (unchanging) - 12UnbalancedWhen the forces are unbalanced:
the object is accelerating
the object is decelerating - 13Free Body DiagramsFree-body diagrams = used to show the relative magnitude and direction of all forces acting upon an object in a given situation.
- 14Determining the net force…Net force: vector sum of all the forces that act upon an object
- 15Review: Forces are Balancedobject at rest
V = zero m/s
objects in motion
V ≠ zero m/s
a = 0 m/s2
a = 0 m/s2
stay at rest
stay in motion
(same speed and direction) - 16Contact forcesfriction, air resistance, normal force
- 17Non-contact forces:gravity, magnetism, electrical force
Information
- Description
- International Baccalaureate Science (Unit 3) Flashcards on MYP 1 Forces PPT , created by Mariana r on 01/04/2016.
- Created by
- Mariana r
- Views
- 226
- Rating