physics-newtons laws

• balanced forces cancel each other out
• unbalanced forces cause a resultant force to act on an object
• newtons first law- an object will remain at rest or at a constant volume unless acted upon by a resultant force
• weight is the force of gravity acting upon an object
• mass is the amount of matter in an object
• mass will not change when you go into space, however weight will,.
• weight calculation: mass x gravitational field strength
• on earth the gravitational field strength id 10 N/kg but is different on other planets
• if the forces are not balanced, the motion will change
• newtons second law- can be used to calculate acceleration or deceleration of an object (resultant force=mass x acceleration)
• newtons third law- if body "A" exerts a force on body "B", then body "B"exerts and equal or opposite force on body "A"
• example of newtons third law - a rocket pushes the exhaust gases backwards, so the gases will push the rocket forwards with the same force but opposite direction
• terminal speed- The forces acting on a skydiver as they fall are, air resistance upwards and weight downwards . The sky divers weight remains the same throughout but air resistance changes due to the change in speed.