The document discusses key concepts in mechanics including:
1. Free body diagrams show only the external forces acting on an object and are useful for solving dynamics problems.
2. Newton's Second Law states that acceleration is proportional to net force and inversely proportional to mass.
3. Impulse is the product of force and time and equals change in momentum, affecting how objects move after collisions or other impacts.
40. The product of force and time is called impulse and is measured in Ns
41.
42. The total impulse is found in reality by measuring the area under an F-t graph
43.
44. A cricket ball has a velocity of 130kmh -1 when bowled. The batsman applies an impulse of 350Ns to the 160g ball. What is the speed of the ball after striking?
45.
46.
47.
48.
49. You can not “measure” these forces, but you can calculate them.
50.
51. Are of the same type (contact, gravitational etc)