Topic P5, Forces

Question 1

What is a Vector Quantity?

Answer 1

Any quantity with magnitude and direction

Question 2

What is a scalar quantity?

Answer 2

Any force with magnitude but no direction

Question 3

What are the contact forces?

Answer 3

Friction
Air Resistance
Tension
Reaction Force

Question 4

What are the non- contact forces?

Answer 4

Magnetic Force
Electrostatic Force
Gravitational Force

Question 5

What does gravitational force do?

Answer 5

Attract 2 objects that have masses

Question 6

What do magnetic forces do?

Answer 6

Attract or repulse, depends on the poles of the magnet

Question 7

What is gravitational force?

Answer 7

The force of attraction between masses

Question 8

What is mass?

Answer 8

The amount of “stuff” in an object

Question 9

What is weight?

Answer 9

The force acting on an object due to gravity

Question 10

What is mass measured in?

Answer 10

Kilograms (kg)

Question 11

What is inertia?

Answer 11

the tendency for the motion of an object to remain unchanged

Question 12

What is Newtons 1st law?

Answer 12

Newton’s first law states that
-if the resultant force of an object is 0:

• if the object is stationary the object will remain stationary
  -if the object is moving, the object will continue to move at the same speed in the same direction ( the same velocity)

Question 13

What is velocity?

Answer 13

The speed of an object in a given direction

Question 14

What quantity is velocity?

Answer 14

A vector quantity

Question 15

What is the typical speed of walking?

Answer 15

1.5 m/s

Question 16

What is the typical speed of running?

Answer 16

3 m/s

Question 17

What is the typical speed of cycling?

Answer 17

6 m/s

Question 18

What is the typical speed of a car?

Answer 18

25 m/s

Question 19

What is the typical speed of a train?

Answer 19

55 m/s

Question 20

What is the typical speed of a plane?

Answer 20

250 m/s

Question 21

What is the typical speed of sound?

Answer 21

330 m/s

Question 22

What is speed?

Answer 22

How fast something is, no direction

Question 23

What quantity is speed?

Answer 23

Scalar quantity

Question 24

What does displacement do?

Answer 24

Displacement measures distance and direction in a straight line from an objects starting point to an objects finishing point

Question 25

What is distance?

Answer 25

How far an object moves

Question 26

What is meant by the term “work done”

Answer 26

When a force causes an object to move through a distance, work is done on an object So a force does work on an object when then force causes a displacement of the object

Question 27

What is a non contact force?

Answer 27

A non-contact force is a force which acts on an object without coming physically in contact with it

Question 28

What is a contact force?

Answer 28

A contact force is a force where the objects are physically touching

Question 29

What can a vector quantity be represented by?

Answer 29

An arrow, the length of the arrow represents the magnitude, and the direction of the arrow represents the direction of the vector quantity

Question 30

Name me an example of a scalar quantity

Answer 30

Speed, distance, mass, time etc…

Question 31

Name me an example of a vector quantity

Answer 31

Force, velocity, displacement, acceleration

Question 32

Weight and mass are ________ proportional

Answer 32

Directly

Question 33

What does an objects “weight” depend on?

Answer 33

The gravitational field strength at the point where the object is

Question 34

What quantity is force?

Answer 34

Vector Quantity

Question 35

Newtons 2nd Law

Answer 35

Newtons 2nd law states that the acceleration of an object is proportional to the resultant force adding on the object, and inversely proportional to the mass of the object

Question 36

According to Newtons 2nd law if a resultant force acts on an object, the object will ________. Finish the sentence

Answer 36

accelerate

Question 37

What does inertial mass measure?

Answer 37

How difficult it is to change the velocity of an object

Question 38

What is Newtons 3rd law?

Answer 38

When 2 objects interact, the forces they exert on each-over are equal in magnitude and opposite in direction

Question 39

What is stopping distance?

Answer 39

The stopping distance of a vehicle is the sum of the distance the vehicle travels during the drivers reaction time (thinking time) and the distance it travels under the breaking force (breaking time)

Question 40

If we increase the speed of a vehicle, what happens to the stopping distance

Answer 40

The stopping distance increases because the greater the speed, the longer the braking distance

Question 41

What can affect a drivers reaction time?

Answer 41

tiredness, drugs, alcohol, distractions

Question 42

What can affect the braking distance of a vehicle?

Answer 42

Adverse roads( wet /icy) weather conditions, poor vehicle conditions (tires/ breaks)

Question 43

Large decelerations may lead to ______ and or loss of ________ . Fill in the blanks

Answer 43

overheating, loss of control

Question 44

In a closed system, the goal momentum before an event is equal to the total momentum after the event, what is this called?

Answer 44

Conservation of momentum