Newtons Laws

Question 1

Second

Answer 1

F= ma
Acceleration is produced when a force acts on a mass
The greater the mass the greater the force required for it to accelerate

Question 2

Third

Answer 2

For every action there is an equal but opposite reaction

Question 3

First

Answer 3

An object will remain at rest unless acted upon by an unbalanced force
A moving object will continue at the same speed and in the same direction until acted on by an unbalanced force

Question 4

Conservation of Linear Momentum law

Answer 4

Total momentum before a collision is equal to the total momentum after a collision in the absence of external forces

Question 5

Define the term coherent waves

Answer 5

Waves from the two sources have a constant phase relationship
They have the same frequency wavelength and velocity

Question 6

Maximum is produced when

Answer 6

Waves meet in phase

Question 7

Why is a driving force increased with time to maintain a constant acceleration?

Answer 7

Faster it goes, the greater air resistance
Increasing F(Drive) keeps unbalanced force constant

Question 8

Change in momentum given by

Answer 8

MV-mu

Question 9

Seatbelt effectiveness

Answer 9

By stretching slightly the time taken for the collision is greater
Same change in momentum
Smaller average force acting on passenger

Question 10

Calculating force acting on a passenger

Answer 10

Ek= 0.5 X m X v ^2
Ew = Ek
Ew = F X D
Rearrange for F