PMT

Question 1

describe what happens when a resultant force F acts on a body with mass m

Answer 1

the body will accelerate in the direction of the resultant force, the resultant force is related to mass and acceleration by the formula F = ma

Question 2

give 6 examples of common forces and explain briefly what they do

Answer 2

• weight - the gravitational force acting on an object, through its centre of mass
• friction - the force that arises when two surfaces rib against each other
• drag - the resistive force on an object travelling through a fluid (like water or air)
• tension - the force within a stretched cable or rope
• upthrust - the upward buoyancy force acting on an object when it is in a fluid
• normal contact force - the force arising when an object rests against another object, it acts perpendicular to the plane of contact