Forces 2

Question 1

Examples of scalar quantitates (6)

Answer 1

Temperature
Mass
Speed
Energy
distance
Time

(TEMSDT)

Question 2

Scalar quantities have a magnitude only (size) but not a …
E.g temperature, energy, mass, distance, time, speed

Answer 2

Direction

Question 3

How to use arrows to represent vectors

Answer 3

Length of arrow= magnitude of vector
Direction of arrow= direction of vector

Question 4

Force definition

Answer 4

A force is a push or pull that acts on an object due to the interaction with another object

Question 5

A force is a push or a pull that acts on an…

Answer 5

Object due to the interaction with another object

Question 6

In contact forces the 2 objects must be….

Answer 6

Physically touching

Question 7

For the normal contact force to be exerted, the 2 objects must be in …contact

Answer 7

Direct
E.g a lamp on a table

Question 8

Non contact vs contact forces

Answer 8

In contact forces, the 2 objects must be physically touching e.g air resistance, friction, normal contact force and tension

In non contact forces, the 2 objects aren’t physically touching e.g weight, electrostatic, magnetic

Question 9

Definition for weight of object

Answer 9

Weight is the Force acting on the object due to gravity

Question 10

Weight is the force acting on an object due to..

Answer 10

Gravity
(Definition of weight)

Question 11

Which changes out of weight and mass

Answer 11

Weight- depends on location of object as weight= mass x gravitational field strength and gravitational field strength changes

Mass never changes (it’s how much matter an object has- an elephant has the same amount on matter on the earth as on the moon)

Question 12

2 pieces of equipment used to determine objects weight

Answer 12

Newton meter
Calibrated spring balance

Question 13

2 pieces of equipment used to determine weight of object are Newton meter and …spring balance

Answer 13

Calibrated

Question 14

Centre of mass definition

Answer 14

Where weight of object acts at a single point

Question 15

2 scenarios when resultant force is 0

Answer 15

Object is stationary
Object is moving at a constant speed

Question 16

Name for forward force acting on moving objects

Answer 16

Thrust

Question 17

Why does kinetic energy get transferred to thermal energy when a car brakes

Answer 17

Friction acts between brake and wheel
Kinetic energy of car transferred to thermal energy store of brakes
(So car slows down as it loses kinetic energy)

Question 18

Important thing to remember in terms of force used when calculating work done (force x distance moved)

Answer 18

Only use force that’s acting in line with the distance (even if the object has forces acting on it in lots of different directions)

Question 19

Inelastic deformation meaning

Answer 19

When forces acting on object are removed, the object doesn’t return back to its original length or shape

Question 20

Moment definition

Answer 20

Turning effect of a force

Question 21

Name for turning effect of a force

Answer 21

Moment

Question 22

Distance used when calculating moment (moments force x distance)

Answer 22

Distance perpendicular to line of action from force

Question 23

True or false, particles collide at right angles with the walls of the container

Answer 23

False
They exert a force at right angles to the wall of the container when they collide (but don’t collide at right angles)

Question 24

Which out of solids, liquids and gases are fluids

Answer 24

Liquids and gases

Question 25

The atmosphere gets…dense as altitude increases (higher up into the sky/ further away from the surface of the earth)

Answer 25

Less

Question 26

Water has a higher pressure at the…of the container

Answer 26

Bottom
(Like sky- pressure increases higher up)

Question 27

2 relevant forces for talking about whether object floats or sinks

Answer 27

Upthrust (upward force)
Weight (downward force of object)

Upthrust equal to weight = object floats
Weight greater than upthrust= object sinks

Question 28

Relationship between weight and upthrust for object to float in water

Answer 28

They are equal

Question 29

Key fact to learn!
How to determine size of upthrust force acting on object in water when object has just been lowered into water

Answer 29

It equals the weight of water that the object has displaced

Question 30

What type of objects have a momentum

Answer 30

Objects that are moving

Question 31

Conservation of momentum meaning

Answer 31

In a closed system total momentum before an event is equal to total momentum after an event

Question 32

…changes in momentum can be dangerous (as they lead to a huge force being applied)

Answer 32

Rapid

Question 33

Newton’s 3 laws of motion describe the effect of….on the…of an object

Answer 33

Forces
Motion

Question 34

Newton’s second law of motion

Answer 34

Force = mass x acceleration

(Force and acceleration are directly proportional)
(Acceleration and mass are inversely proportional)

Question 35

Newton’s 3rd law of motion

Answer 35

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

Question 36

Inelastic deformation is where when…are removed the object doesn’t return to its original shape or length

Answer 36

Forces acting on an object

Question 37

Centre of mass of object is where…of object at a single point

Answer 37

Weight

Question 38

Centre of mass of object is where weight of object…

Answer 38

Acts at a single point