section 2 Flashcards
What is the difference between mass and weight?
Mass is how much “stuff” there is.
Weight is the force of gravity upon the object
What is an object’s centre of mass
The position on an object where the weight acts from
Explain why the object moves at constant speed
The first force is equal to the second force on the object (e.g for terminal velocity, the weight is equal to the drag on the object)
Therefore the net force is zero
Due to Newton’s First Law, this means the acceleration of the object is zero
State the name of the force opposing the motion of the truck/driver/etc.
Friction/ Air Resistance/ Water Resistance/ DRAG
State Hooke’s Law
The extension is directly proportional to the fore applied, as long as the elastic limit is not exceeded
State the principle of moments
When an object is in equilibrium, the sum of the clockwise moments equals the sum of the anticlockwise moments
What is “hysteresis”
“The energy lost in the elastic band as you stretch and unstretch it
