Pyisics

What is newtons first law of motion?

• the acceleration of an object is directly related to the net force and inversely related to its mass. Acceleration of an object depends on two things, force and mass.

• an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A. ... We sometimes refer to this law loosely as action-reaction, where the force exerted is the action and the force experienced as a consequence is the reaction.

• if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

• An object at rest will remain at rest and an object in motion will remain in motion (at constant velocity) unless acted upon by an external force.

What is the SI unit of speedl

• Kelvin

• newtons

• metre per second

• (N/m-2 or kg m-1s-2).

What is matter made up of

• papyrus, parchment,

• Nitrogen and oxygen

• Cheese and butter

• tiny particles called atoms and molecules

Approximately how far is the sun from the earth

• 190.73 millon km

• 147.19 million km

• 120.36 millon km

• 92.35 millon km

What does the nucleus consist of

• Protons

• Electrons and protons

• Neutrons and protons

• Electrons and neutrons

Who is known as the father of chemistry

• Albert Einstein

• Antoine Lavoisier

Is velocity a scalar quantity

• Yes

• No

What is the atomic number of sodium

• 18

• 24

• 11

• 17

What is the valency of carbon

• 1 proton and 1 neutron

• 8 protons and 3 neutrons

• 5 protons and 2 neutrons

• 6 protons and 6 neutrons

Example of a cupric ion

• Silver

• Copper

• Magnesium

• Boron