Revision Year 9 Topics: The Basics

What is meant by 'a vector quantity'?

• Physical quantities that have magnitude only

• Physical quantities that have direction only

• Physical quantities that have both magnitude and direction

The formula for acceleration is

• $\frac{final\ velocity-initial\ velocity}{time}$

• $\frac{initial\ velocity-final\ velocity}{time}$

• $\frac{time}{final\ velocity-initial\ velocity}$

What is meant by 'inertia'?

• Amount of substance in a body

• Resistance of a body to start or stop moving or change its motion

• Gravitational force acting on a mass

In circular motion, the resultant force of an object is acting

• Along the circle

• Tangential to circle

• Towards the centre of the circle

The density of a substance is given by

• $mass\ \times gravitational\ field\ strength$

• $\frac{mass}{volume}$

• $\frac{volume}{mass}$

A moment of an object is given by

• force X distance

• force X perpendicular distance from force to pivot

• force / perpendicular distance from force to pivot

Which statement or formula applies to the 'Principle of Moment'?

• sum of clockwise moments = sum of anti-clockwise moments

• $F_a\times d_a=F_c\times d_c$

• For a body to be in equilibrium, the sum of clockwise moments about pivot is equal to the sum of anticlockwise moments about the same pivot

What is meant by 'centre of gravity'?

• The ability of an object to regain its original position after it has been displaced slightly

• A point which in in the centre of an object

• A point through which an object’s whole weight appears to act

In Hooke's Law, what is the relationship between the extension of an object and the force applied to it?

• Directly proportional

• Inversely proportional

• Not proportional at all

What is meant by 'limit of proportionality'?

• Any point where the extension produced is proportional to the applied force

• The point beyond which the extension produced is still proportional to the applied force

• The point beyond which the extension produced is no longer proportional to the applied force