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FORCE
This is HEAVY!
I can’t hold it anymore!
Can someone help me?
FORCE• push or pull • object’s interaction with its
environment• vector quantity• unit is Newton
NET FORCE
• the sum of all the forces acting on the object.
• a physical quantity that is capable of changing an object’s state of motion
5 N
3 N
3 N
5 N
Net force = 2N, right
Net force = 8N, right
Four Fundamental Forces1. Gravitational Force
– Force of attraction between two masses
Position of the stars and planets
221
r
mmGFg
2. Electromagnetic ForceForce that affects charge particles
Your hair will be attracted to a charged balloon
The electrons from the clouds will travel towards the land - thunderbolts
3. Weak Nuclear Force
4. Strong Nuclear Force
Four Fundamental Forces
Radioactive decay
Binds proton in the nucleus
Forces acted on an object
1. Weight - gravitational attraction of an object and the earth- always directed downwards- W = mg weight
Normalforce
2. Normal Force- support force exerted upon an object- perpendicular to surface
Forces acted on an object
3. Applied force - force applied simply by pushing or pulling
weight
Normalforce
Appliedforce
Friction
4. Friction- force exerted by a surface as an object moves across it - parallel to surface and opposite to the direction of motion
Forces acted on an object
5. Tension - force which is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends.
Tension
6. Air resistance- force exerted by the air as an object moves in it- opposite to the direction of motion
Newton’s Law of Motion
Newton’s Law of Motion
1. Law of inertia
2. Law of Acceleration
3. Law of Interaction
I have answer to your inquiry
Law of InertiaThe body at rest tends to remain at rest, and a body in motion continues to move at constant velocity unless acted upon by a net force.
Inertia is the property of a body which resists any change in its state of rest or motion.
Inertia is proportional to mass.
Importance of using Seatbelts
Importance of Seatbelts
Seatbelt exerts force on the person for him not to move forward when it suddenly stops.
Force (seatbelt)
Try This at HomeEgg Drop Challenge
Law of Acceleration
The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object.
Law of Acceleration
Acceleration is directly proportional to mass
Acceleration is directly proportional to mass
a F
a 1/m
a = F/m
Law of Acceleration
maForm
Fa
Force (N) Mass (kg) Acceleration (m/s2) Your answer is...
20 ? 2 Try again
15 3 ? Try again
? 0.9 3 Try again
30 ? 0.5 Try again
0.6 0.2 ? Try again
? 20 10 Try again
Law of Interaction
For every action, there is an equal and opposite reaction.
Law of Interaction
You push the wall by 50 N
The wall push you by 50 N in the opposite direction
Action
Reaction
Law of InteractionAction Reaction
You push the ground downward
The apple is pulled by the Earth downward
The rocket exhausts gas to the ground downward
The ground will push you upward
The Earth is pulled by the apple upward
The gas will push the rocket upward
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