9 terms

What is the centre of mass

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

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Draw the symbol for proportional to

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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