topic 5

Question 1

what is force

Answer 1

a vector quantity

Question 2

what do vector quantities have

Answer 2

A magnitude or direction

Question 3

4 examples of vector quantities

Answer 3

• Force
• Acceleration
• Momentum
• displacement

Question 4

what are scalar quantities

Answer 4

physical quantities that have magnitude but no direction

Question 5

5 examples of scalar quantities

Answer 5

• Speed
• Mass
• Time
• Temp
• Distance

Question 6

what does the length of the vector quantity show

Answer 6

its magnitude

Question 7

what does the arrow in vector quantities show

Answer 7

the direction of the quantity

Question 8

what quantity is speed

Answer 8

scalar

Question 9

what are all forces

Answer 9

contact or non-contact forces

Question 10

what is a contact force

Answer 10

when two objects have to be touching for a force to act

Question 11

what is a non-contact force

Answer 11

if the objects do not need touching for the force to act

Question 12

what is an interaction pair

Answer 12

a pair of forces that are equal and opposite and act on two interacting objects

Question 13

(Momentum) the greater the mass of an object or the greater its velocity …

Answer 13

The momentum the object has

Question 14

What quantity is momentum

Answer 14

A vector quantity- it has size and direction

Question 15

Momentum (kg m/s) =

Answer 15

Mass (kg) X velocity (m/s)

Question 16

What is “conservation of momentum”

Answer 16

In a closed system the total momentum before an event is the same as after the event

Question 17

Stopping distance =

Answer 17

Thinking distance + braking distance

Question 18

What is your thinking distance affected by?

Answer 18

• speed

- your reaction time

Question 19

What is braking distance affected by?

Answer 19

• speed
• weather
• condition of tyres
• how good the brakes are

Question 20

What is the breaking distance of 30mph?

Answer 20

14 m

Question 21

What is the braking distance of 60 mph?

Answer 21

55 m

Question 22

What is the braking distance of 70mph?

Answer 22

75 m

Question 23

The work done between the brakes and the wheels transfers energy from the …

Answer 23

Kinetic energy stores of the wheels to the thermal energy stores of the brakes

Question 24

What does a larger braking force mean

Answer 24

A larger deceleration

Question 25

The faster a vehicle is going …

Answer 25

The more energy it has in its kinetic stores, so the more work needs to be done to stop it

Question 26

What is inertia

Answer 26

The tendency to continue in the same state of motion

Question 27

What does an objects inertial mass measure

Answer 27

How difficult it is to change the velocity of an object

Question 28

What is Newtons third law

Answer 28

When 2 objects interact, the forces they exert in each other are equal and opposite

Question 29

What does newtons first law state

Answer 29

That a resultant force is needed to make something start moving, speed up or slow down

Question 30

What will a non-zero resultant force always produce

Answer 30

Acceleration or deceleration in the direction of the force

Question 31

The larger the resultant force acting on an object ..

Answer 31

The more the object accelerates

Question 32

Force and acceleration are ..

Answer 32

Directly proportional

Question 33

What is acceleration inversely proportional to

Answer 33

The mass of the object

Question 34

What 5 forms can acceleration take

Answer 34

• stopping
• speeding up
• slowing down
• changing direction
• starting

Question 35

What is drag

Answer 35

The resistance you get in a fluid (a gas or a liquid(

Question 36

Give an example of a type of drag

Answer 36

Air resistance

Question 37

What is the important factor in reducing drag

Answer 37

Keeping the shape of the object streamlined