Force, Mass and Momentum

Question 1

State the law of flotation

Answer 1

The law of flotation states that when a body is wholly or partially immersed, it floats if the weight of the liquid displaced is equal to the weight of the body

Question 2

State the laws of equilibrium

Answer 2

sum of forces = 0, clockwise moment = anti-clockwise moment

Question 3

Define pressure

Answer 3

Pressure is the force applied perpendicular to the surface of an object per unit area

Question 4

State Archimedes’ principle

Answer 4

Archimedes’ principle indicates that the upward buoyant force that exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces

Question 5

What is the principal energy conversion that is taking place as the skier travels along the course?

Answer 5

potential energy - Kinetic energy

Question 6

Define the moment of a force

Answer 6

F*d

Question 7

When the toy is knocked over, it always returns to the upright position. Explain why this happens.

Answer 7

Has a turning moment about fulcrum

Question 8

Why is there no atmosphere on the moon?

Answer 8

Gravitational force too weak