P8-Forces In Balance

Question 1

Magnitude

Answer 1

How big something is

Question 2

A vector quantity

Answer 2

A vector quantity has magnitude and direction

Question 3

A scalar quantity

Answer 3

A scalar quantity has only magnitude

Question 4

Examples of scalar quantities (8 examples)

Answer 4

Speed, distance, energy, mass, temperature, pressure, work and power

Question 5

Examples of vector quantities (6 examples)

Answer 5

Velocity, displacement, force, weight, acceleration, momentum

Question 6

Examples of contact forces

Answer 6

Compression, tension, thrust, friction, air resistance, drag (water resistance), lift and upthrust

Question 7

Examples of non-contact forces

Answer 7

Weight (gravitational force), magnetic push and pull, electrostatic push and pull and nuclear

Question 8

Unbalanced forces on an object could change it’s:

Answer 8

Speed, direction and shape. It will accelerate or deccelerate

Question 9

If an object has balanced forces acting upon it…

Answer 9

It either stays still or moves at a constant velocity

Question 10

Newton’s first law of motion

Answer 10

If the forces acting upon an object are balanced, the reultant force on the object is 0

Question 11

Newton’s third law of motion

Answer 11

When 2 objects interact with each other they exert equal and opposite forces on each other.

Question 12

When the resultant force on an object is not zero…

Answer 12

The forces acting on an object are not balanced

Question 13

Centre of mass

Answer 13

The point at which all the mass of an object seems to be concentrated

Question 14

Stable equilibrium

Answer 14

When an object returns to it’s original position if disturbed

Question 15

Unstable equilibrium

Answer 15

If an object falls or topples when disturbed

Question 16

To change an objects stability:

Answer 16

Change the base width

Change the height of the centre of mass