AS Unit 1 definitions

A scalar quantity is one that has​ (a)  

• magnitude only
• magnitude and direction
• direction only
• bananas

A vector quantity is one that has​ (a)  

• magnitude and direction
• direction only
• bananas
• magnitude only

The moment of a force is ​ (a)   x ​​ (b)   (c)  

• force
• perpendicular
• distance
• mass
• horizontal

Equilibrium

What must be true for a system to be in equilibrium (static - not moving)

• The sum of moments must be zero

• lefty turny equal righty turny

• Forces must be equal on each side of the pivot

• uppy forces equal downy forces

• The sum of forces must be zero

Displacement is the ​ (a)   distance travelled between two points

• shortest
• longest
• actual
• banana

What is the correct definition of 'Centre of Gravity'

• The point at which the mass of the body may be considered to act

• The middle of an object

• The centre of the Earth

• The point at which the weight of the body may be considered to act

Match the following

• rate of change of distance

• Mean Acceleration

• total distance / total time

• Instantaneous Speed

• change in velocity / time taken

• Mean Velocity

• rate of change of displacement

• Mean Speed

• total displacement / total time

• Instantaneous Velocity

Newtons 3rd Law

• If body A exerts

• and opposite in direction on body A.

• then body B exerts a force

• a force on body B

• that is equal in magnitude

What is the definition of Newtons 2nd Law?

F=?