8.3 Quantities and units

Question 1

What does SI stand for?

Answer 1

» The international System of Units

Question 2

What is the base SI unit for Mass?

Answer 2

» Kilogram - kg

Question 3

What is the base SI unit for length/displacement?

Answer 3

» Metres - m

Question 4

What is the base SI unit for time?

Answer 4

» Seconds - s

Question 5

What is the base SI unit for speed/velocity?

Answer 5

» M, s ^-1

Question 6

What is the base SI unit for Acceleration?

Answer 6

» Metres per second squared

Question 7

What is the base SI unit for weight/Force?

Answer 7

» Newton
» Kgms^-2

Question 8

In which direction does the weight of an object act in?

Answer 8

» Act vertically downs, the weight is equal to mass x g

Question 9

In which direction does the normal reaction act in?

Answer 9

» Acts perpendicular to the surface when an object is in contact with the surface

Question 10

In which direction does friction act in?

Answer 10

» Acts in the opposite direction of which the motion is moving in, acts between the 2 rough surface

Question 11

In which way does tension act in?

Answer 11

» The direction in which the object is being pulled along by a string, the force is called tension

Question 12

What is thrust/compression?

Answer 12

» If an object is being pushed along using a light rod, the force acting on the object is called the thrust or compression in the rod

Question 13

What is Buoyancy?

Answer 13

» Upward force on a body that allows it to float or rise when submerged

Question 14

What is air resistance?

Answer 14

» Opposes the motion, usually opposes the direction of the weight of the object