Force and Motion Chapter 2. What is a Force?. A force is a push or pull on an object by another object and measured in newton (N). Forces are vectors. Force is a push. Force is a pull. Non-contact forces (action at a distance ). Some Common Forces.
Force is a push
Force is a pull
Weight (W) is the force of gravity on an object.
Tension Force (T) is the force provided by a string or rope.
Normal force (N) is the force provided by a surface perpendicularly.
Friction force (f) is a resistance to any attempt to move an object along a surface in contact
Your mass is 70 kg, then on earth your weight is about 700 N, but on moon it is 182 N. How?
Identify the forces acting on the object shown in the following diagram
“The property of objects to resist changes in motion.”
Note: The direction of the net force is always in the direction of the bigger force
Newton’s first law of motion, usually called
‘LAW OF INERTIA’
It is the restatement of Galileo’s Idea.
If the net force acting on an object is zero, then the object remains at rest or moving continuously with constant velocity along straight line
A box is suspended by a rope and it is at rest. The mass of the box is 20kg
Find the tension in the rope
The object shown as a dark dot is under the action of four forces. The object will
Move to the right
Move to the left
Not move because it is under mechanical equilibrium
Hint: consider the length of each vector
F1 = 40 N
F2= 28 N
Any two objects in the universe attract each other with a force that is