The point where the mass can be thought of as being concentrated
Define the method for finding the centre of mass of an object
Set up a clamp stand, clamp and put a cork inside the clamp. Cut out a random shape of card and pin it onto the cork. Add a weight on a piece of string onto the pin. Draw the line of the string onto the piece of paper. Move the paper to a different position and draw another line. Where the two lines intersect should be the centre of mass of the object and the paper should turn evenly without swinging
Where is the centre of mass of a symmetrical object
Along the axis of symmetry
State Newton's First Law
If the resultant force acting on an object is 0 and the object is stationary, the object remains stationary. If the resultant force acting on a object is 0 and the object is moving, it will continue to move at the same speed in the same direction.
What is inertia
Newton's first law
State Newton's Second Law
Acceleration is proportional to the resultant force of the object. Acceleration is inversely proportional to the mass of the object. Inertial mass is a measure of how difficult to change the velocity of an object. Inertial mass is the ratio of force over acceleration.
Draw the symbol for approximately equal to
Draw the symbol for proportional to
State Newton's Third Law
When two objects interact, the forces they exert on each other are equal and opposite. To every action, there is an equal and opposite action