# Khoirul S olehah Nur Athirah K hadijah - PowerPoint PPT Presentation

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Khoirul S olehah Nur Athirah K hadijah. Who is he?.

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Khoirul S olehah Nur Athirah K hadijah

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#### Presentation Transcript

KhoirulSolehah

NurAthirah

Who is he?

Sir Isaac Newton was born on 4 January 1643 . Sir Isaac Newton (4 January 1643  – 31 March 1727 [OS: 25 December 1642 – 20 March 1727])[1] was an Englishphysicist, mathematician, astronomer, natural philosopher, alchemist, and theologian who is perceived and considered by a substantial number of scholars and the general public as one of the most influential men in history.

What can you predict?

Newton’s first laws

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Questions

Question 1:   The gravitational force of earth acting on a body of mass 1 kg is _______.

a)8.9 N

b)9.8N

c)980N

d)1N

Question 2:   The momentum of a toy bus of 0.01 kg moving with a velocity of 5 m/s is

a) 0.005 kg m/sb) 0.05 kg m/sc) 0.005 N sd) 0.5 kg m/s

Question 3:   When an object undergoes acceleration

a) its speed always increasesb) its velocity always increasesc) it always falls towards the Earthd) a force always acts on it

Question 4 :A force of 625 N acts on a body of mass 25 kg. Find the acceleration of the body.

Solution:

Force (F) = 625 N Mass (m) = 25 kg

Acceleration (a) = ?F = ma a= F/m

a= 625/25

Acceleration = 25 m/s2

Question 5 :Calculate the change in momentum of a body weighing 10 kg when its velocity decreases from 20 m/s to 0.2 m/s.

Solution:

Mass of the body (m) = 10 kg

Initial velocity (u) = 20 m/s Final velocity (v)= 0.2 m/s

Change in momentum = m (v-u) = 10 (0.2 - 20)

= 10 (-19.8) Change in momentum = -198 N s

WHAT WOULD HAPPEN?

Newton's 3rd law stated: "Forces always occur in pairs. If object A exerts a force F on object B, then object B exerts an equal and opposite force –F on object A" or in slogan style:

"Every action has an equal and opposite reaction"

• In contrast, Newton's 3rd law always involves more than one object.

• When a gun is fired, the force of the gas produced by burning gunpowder hurls out the bullet. By Newton's law, the gun itself recoils backwards.

•   The nozzle of a big firehouse has handles which firefighters must grasp firmly, because as the jet of water shoots out of it, the hose itself is forcibly pushed back.

OPEN THE BOTTLE

LAUNCHING OF A ROCKET

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THAT’S ALL

THANK YOU…(>_<)