P8 Forces And Balance Key INFO

Question 1

What are vectors?

Answer 1

Physical quantities that have direction

Question 2

What are scalars?

Answer 2

Physical quantities that have NO specific direction.

Question 3

A Vector has _____ and ______

Answer 3

Magnitude and direction

Question 4

A scalar has _____

Answer 4

Magnitude

Question 5

What can vectors be presented by?

Answer 5

An arrow with a direction

Question 6

What is Newton’s third law of motion?

Answer 6

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

Question 7

What is a good example of Newton’s third law of motion with a boxer punching a bag with a force of 100 Newtons

Answer 7

The boxer will punch the bag at a force of 100 Newtons and receives 100 Newtons from the bag

Question 8

What is displacement?

Answer 8

Distance in a given direction(basically the shortest, straightest route from A to B)

Question 9

How do you know if an object has balanced forces?

Answer 9

• it remains Stationary
• travels at a constant speed
• the resultant force =0

Question 10

What is equilibrium?

Answer 10

A state of balance

Question 11

How do you known if an object is at equilibrium?

Answer 11

• it remains Stationary
• travels at a constant speed
• the resultant force =0
• no turning effect

Question 12

What does a resolution of forces do?

Answer 12

Breaks down a force into a vertical and horizontal component.

Question 13

What is the centre of mass?

Answer 13

Where the mass is most concentrated(usually at the objects midpoint)

Question 14

What is the centre of mass on an object with more than 1 line of symmetry?

Answer 14

Where the lines of symmetry meet

Question 15

What is the centre of mass of an object?

Answer 15

The point in which the mass is throught of to be the most concentrated

Question 16

If you suspend an object and release it what will happen?

Answer 16

It will come to rest with its centre of mass directly BELOW the point os suspension

-the object is then in equilibrium (at a rest) so its weight does not exert a turning effect.

Because of this the objects centre of mass is directly below the point of suspension

Question 17

What is suspension?

Answer 17

Suspension is defined as a time period during which something temporarily stops

In this case the objects equilibrium state

Question 18

What happens when an object is freely suspended?

Answer 18

It returns to equilibrium

Question 19

What does a parallelogram of forces do?

Answer 19

Created a magnatude(resultant force) from two seperate vectors with an angle

Question 20

What does Newton’s first law of motion state?

Answer 20

If the forces acting on an object are balanced, the resulant force is 0 and the object is at a rest(stationary)

-if the object is moving it remains at a constant speed