forces

Question 1

newton first law of motion

Answer 1

every object will continue in its state of rest or uniform motion in a straight line unless a resultant force acts on it

Question 2

newton second law of motion

Answer 2

when a resultant force acts on an object of a constant mass, the object will accelerate in the direction of the resultant force. the product of the mass and the acceleration of the object gives the resultant force.
F=ma

Question 3

newton third law of motion

Answer 3

if body A exerts force Fab on body B, body B will exert an equal and opposite force Fba on body A

Question 4

friction

Answer 4

constant force that opposes or tends to oppose the motion between surfaces in contact