topic 3: dynamics

Question 1

Newton’s first law of motion.

Answer 1

An object will remain at rest or in a state of uniform motion unless it is acted on by an external force.

Question 2

law of inertia

Answer 2

Reluctance of an object to “accelerate”

Question 3

acceleration 3 meanings

Answer 3

Speed up 
slow down
Change direction (centripetal acceleration)

Question 4

newtons second law

Answer 4

Force = mass x acceleration

Question 5

define force

Answer 5

Rate of change of momentum

Question 6

Force =

Answer 6

F= ma
F = m(v-u)/t
F = mv - mu / t

Question 7

Impulse

Answer 7

F = m a
F = m(v-u/t)
Ft = m(v-u)
Ft = mv - mu

Question 8

What is impulse

Answer 8

impulse is force x t

Units are Ns (newton seconds)

Question 9

newtons third law

Answer 9

When object A exerts a force on object B

then object B exerts an equal and opposite force on object A