P5 - Forces

Question 1

What is a vector quantity

Answer 1

Have a magnitude and a direction

Question 2

Examples of vector quantities

Answer 2

Force, velocity, displacement , acceleration

Question 3

What are scalar quantities

Answer 3

Have magnitude but no direction

Question 4

Examples of scalar quantities

Answer 4

Speed, distance, mass, temperature, time

Question 5

What is a contact force

Answer 5

When two objects have to be touching for a force to act, the force is a constant force

Question 6

What is a non contact force

Answer 6

If the objects do not need tobe touching

Question 7

What is mass

Answer 7

The amount of matter in an object

Question 8

What is weight

Answer 8

Weight is the force acting on an object due to gravity

Question 9

Waht does the weight of an object depend on

Answer 9

Its mass and the strength of the gravitational field it is in

Question 10

How can you calcualate the weight of an object

Answer 10

Mass x gravitational Field strength

Question 11

Relationship between mass and weight

Answer 11

They are directly proportional

Question 12

What is resultant force

Answer 12

Number of forces acting on an object , can be replaced by a single force

Question 13

What does a resultant force have the same effect as ?

Answer 13

All the original forces added together

Question 14

When a force moves an object through a distance , energy is transferred

Answer 14

And work is done on the object

Question 15

What has to happen to make an object move

Answer 15

A force must act on it

Question 16

A force acts on an object .Causes energy

Answer 16

To be transferred to the object

Question 17

Whwn you apply force to an object what may happen to it

Answer 17

May deform ,( stretch, compress or bend )

Question 18

How many forces do you need to make an object deform

Answer 18

An object is deformed when more than one force is acting on the object.One force would just make the object move, not change the shape

Question 19

What is elastically deformed

Answer 19

It can go back to original shape and length after force has been removed

Question 20

What is inelastically deformed

Answer 20

If an object doesn’t go back how it was

Question 21

When a force stretches or compresses then

Answer 21

Work has been done

Question 22

When a force stretches a speing, causes it to

Answer 22

Extend

Question 23

This extension in spring is what

Answer 23

Difference in length between the stretched and unstretched spring

Question 24

What ia displacement

Answer 24

Measures the distance and direction in a straight line from an object’s starting point to its finishing point

Question 25

What is speed

Answer 25

How fast gou are going

Question 26

What is velocity

Answer 26

Velocity is speed in a given direction

Question 27

Speed of person walking

Answer 27

1.5

Question 28

Speed of person running

Answer 28

3

Question 29

Speed of person cycling

Answer 29

6

Question 30

Speed of a car

Answer 30

25

Question 31

Speed of train

Answer 31

30

Question 32

Speed of passenger plane

Answer 32

250

Question 33

What is acceleration

Answer 33

Change in velocity in a certain amount of time

Question 34

What is Newton's First Law

Answer 34

If the reultsnt force on a stationary object is zero, the object will remain stationary.If the resultsnt force of a moving object is zero, carry on moving at same velocity

Question 35

The larger the resultant force acting on an object is the

Answer 35

More the object accelerates

Question 36

What is Newton's second law

Answer 36

Says that the firce acting on an object and the acceleration of the object is directly proportional

Question 37

What is Newton's third law

Answer 37

When two objects interact, the forces they exert on each other are equal and opposite

Question 38

What does Newton's third law mean

Answer 38

Means if you push something , it will push you back against you, just as hard

Question 39

Stopping distance =

Answer 39

Thinking distance + braking distance

Question 40

What is thinking distance

Answer 40

How far the vehicle travels during the dirver's resction time

Question 41

What is braking distance

Answer 41

Distance taken to stop under the braking force

Question 42

Stopping distance for different speeds can be estimated

Answer 42

The heavier a vehicle is, or the faster it is tracelling, the longer the stopping distsnce will be

Question 43

What is your thinking distsnce be affected by

Answer 43

Your speed Resction time

Question 44

What is your braking distance affected by

Answer 44

A fast a vehicle travels , longer it tskes to stop. Weather or road surface.If there is less grip on the road braking distance will be slower Condition of your tyres How good brakes are