forces

Question 1

examples of scalar forces

Answer 1

mass
temperature
speed
energy
distance
time

Question 2

scalar quantities:

Answer 2

magnitude (size)
do not have a direction

Question 3

examples of vector quantities

Answer 3

displacement
weight
force
acceleration
velocity
momentum

Question 4

vector quantities:

Answer 4

magnitude
direction
the length of the arrow represent the magnitude of the vector and the direction of the arrow represents the direction of the vector

Question 5

what is the definition of a force?

Answer 5

it is a push or a pull that acts on an object due to an interaction with another object

all forces have a magnitude and direction-vector quantity

vector quantity

can be split into two categories: contact and non-contact forces

Question 6

what is a contact force?

Answer 6

it happens when the two objects are physically touching

examples of contact forces:
tension in a rope
friction
air resistance

Question 7

air resistance with a skydiver

Answer 7

As the skydiver falls through the air, air particles collide with the parachute

this causes the force of air resistance to act upwards

Question 8

normal contact force:

Answer 8

the force can only happen if the two objects are in direct contact

Question 9

what is a non contact force?

Answer 9

it happens when the two objects are not physically touching

Question 10

gravatitional force:

Answer 10

attracts all objects to other objects

Question 11

electrostatic force:

Answer 11

is the force between two charged objects

objects with opposite charges experience an electrostatic force of attraction

objects with the same charges experience an electrostatic force of repulsion

Question 12

magnetic force:

Answer 12

is the force experienced by certain objects in a magnetic field

Question 13

what is the definition of mass?

Answer 13

the mass of an object tells us how much matter the object has in it

kilograms

scalar quantity

Question 14

what is the definition of weight?

Answer 14

it is the force acting on a object due to gravity

newtons

the weight of the object is directly proportional to the mass of the object

Question 15

what is the centre of mass?

Answer 15

the centre mass is the point in an object where its mass is evenly balanced in all directions

Question 16

what is the resultant force?

Answer 16

it is the single force that represents the combination of all the forces acting on an object

Question 17

how to work out the resultant force

Answer 17

we subtract the smaller force from the larger force

Question 18

what happens if the two forces are the same?

Answer 18

the resultant force is zero as they are balanced

Question 19

free body diagrams

Answer 19

the object is shown as a point

the forces are drawn as arrows from the point

Question 20

what is newtons first law of motion on stationary objects?

Answer 20

if the resultant force is acting on a stationary object is zero then the object will remain stationary

Question 21

what is newtons first law of motion on moving objects?

Answer 21

if the resultant force is acting on a moving object is zero than the object will continue moving in the same direction at the same speed

Question 22

what happens to the objects speed when you apply a resultant force to the right?

Answer 22

this resultant force causes the object accelerate

Question 23

what happens to the object speed when you apply a resultant force to the left?

Answer 23

this resultant force causes the object to decelerate

Question 24

what two things can a resultant force do to an object?

Answer 24

change the direction and the speed

Question 25

what is Newton's second law of motion?

Answer 25

the acceleration of an object is directly proportional to the resultant force acting on an object and inversely proportional to the mass of the object if we have a greater force we have a greater acceleration if the mass is larger the acceleration will be smaller

Question 26

what is newtons third law of motion?

Answer 26

whenever two objects interact the forces they exert are equal and opposite

Question 27

what is the stopping distance?

Answer 27

thinking distance + braking distance

Question 28

what is the thinking distance

Answer 28

the distance a vehicle travels in the time it takes for a driver to react to a hazard and apply the brakes

Question 29

factors that affect the thinking distance:

Answer 29

how quick your reaction time speed of the vehicle

Question 30

factors that affect the braking distance:

Answer 30

the speed of the vehicle-the faster the vehicle is travelling the longer the braking distance will be wet, icy, snowy roads significantly reduce traction leading to longer braking distance poor road surfaces (potholes) vehicle condition (tires, brakes and vehicle weight

Question 31

what is the braking distance?

Answer 31

the distance a vehicle travels after the driver applies the brakes until the vehicle comes to a complete stop

Question 32

what does elastically deformed mean?

Answer 32

when a material can return to its original shape when the force has been removed

Question 33

what is the typical walking speed

Answer 33

1.5m/s

Question 34

what is the typical running speed

Answer 34

3 m/s