Forces

Question 1

What do scalar quantities have?

Answer 1

Magnitude (size/number) ONLY

Question 2

What do vector quantities have?

Answer 2

Magnitude(size/number) and direction

Question 3

How can vector quantities be represented?

Answer 3

By arrow, length of arrow is magnitude and direction of arrow is direction

Question 4

Name 3 contact forces?

Answer 4

-Friction
-Tension
-Air resistance

Question 5

Name 3 non-contact forces?

Answer 5

-Gravitational
-Electrostatic
-Magnetic

Question 6

Define mass?

Answer 6

Amount of substance present in an object

Question 7

What does mass have?

Answer 7

MAGNITUDE (size) only

Question 8

Define weight?

Answer 8

Force acting on mass, depends on gfs

Question 9

What weight have?

Answer 9

Magnitude and direction

Question 10

Define resultant force?

Answer 10

Total effect of all the different forces

Question 11

When can you say work had been done?

Answer 11

When a force causes an object to move

Question 12

Whst happens when work is done against frictional forces acting on an object?

Answer 12

Temperature of object rises

Question 13

What does elastically deformed mean?

Answer 13

When stretched it returns to its original state

Question 14

What does inelastically deformed mean?

Answer 14

Doesn’t return to original state

Question 15

What is extension directly proportional to?

Answer 15

Force applied (when limit of proportionality isn’t exceeded)

Question 16

What is weight directly proportional to?

Answer 16

Mass

Question 17

5 examples of scalar quantities?

Answer 17

☆Mass
☆Energy
☆Speed
☆Time
☆Volume

Question 18

4 examples of vector quantities?

Answer 18

☆Velocity
☆Acceleration
☆Force
☆Displacement

Question 19

Define velocity?

Answer 19

Speed in a given direction

Question 20

What type of velocity would a car travelling round a bend have?

Answer 20

Varying velocity as changing direction

Question 21

What does motion have that acts towards the center?

Answer 21

Resultant centripetal force

Question 22

What is centripetal force?

Answer 22

The resultant force (all thr forces) which keep object moving in a circular path

Question 23

How can you calculate the speed of an accelerating object using a distance-time graph?

Answer 23

Find the gradient

Question 24

What is terminal velocity?

Answer 24

Constant speed object reaches

Question 25

What happens to the speed of an object falling through a liquid?

Answer 25

1) accelerate due to gravity 2) resultant force reaches zero 3) falls at terminal velocity

Question 26

What did Newton's first law mean in terms of velocity?

Answer 26

Velocity of an object will only change if there's a resultant force acting on an object

Question 27

What was Newton's first law? (Object stationary)?

Answer 27

If resultant force acting on object is 0 + object stationary, object remains stationary

Question 28

What is Newton's first law? (Object moving)?

Answer 28

If resultant force is 0 and object moving, object continues to move at same speed+direction (velocity stays the same)

Question 29

Define inertia?

Answer 29

The likelihood of objects to continue in their state of rest or same motion

Question 30

What is Newton's second law?

Answer 30

Acceleration of an object is proportional to the resultant force acting on the object, inversely proportional to the objects mass

Question 31

What is inertial mass?

Answer 31

A measure of how difficult it is to change the velocity of an object. Defined by the ratio of force over acceleration

Question 32

What is Newton's third law?

Answer 32

Whenever two objects interact, forces they exert on each other r equal + opposite

Question 33

What is an example of Newton's third law?

Answer 33

When a 🐟 swims 🏊‍♀️ it exerts force on the 💧 pushing it backwards, water exerts an equal+ opppsite force pushing it back

Question 34

What is stopping ✋️ distance?

Answer 34

Thinking distance+braking distance

Question 35

The faster the speed means what in terms of stopping distance?

Answer 35

Greater stopping distance

Question 36

Why does faster the speed = greater stopping distance?

Answer 36

🚗 travels further in time taken to apply brakes

Question 37

What can breaking distance be affected by?

Answer 37

-Veichle mass -Adverse conditions -Poor vehicle condition

Question 38

What are some adverse conditions that affect breaking distance?

Answer 38

~Rain ~Ice ~Snow

Question 39

What are some poor veichle conditions that affect breaking distance?

Answer 39

~Worn brakes ~Worn tyres

Question 40

What happens when force is applied to brakes?

Answer 40

1)Work done by friction force between brakes+wheel 🛞 2)Reduces veichle kinetic energy 3)Temp of brakes increase 🔥

Question 41

What does the greater the breaking force mean in terms of deceleration?

Answer 41

The greater the deceleration 🚗

Question 42

What is work done to stop 🛑 a veichicle equal to?

Answer 42

Initial kinetic energy

Question 43

What is initial kinetic energy equal to in terms of stopping a vehicle?

Answer 43

The work done to 🛑 veichle

Question 44

What can large deceleration lead to?

Answer 44

Brakes overheating + loss of control

Question 45

Define momentum?

Answer 45

Product of objects mass+velocity

Question 46

Define conservation of momentum?

Answer 46

(In a closed system) total momentum is equal to total momentum after

Question 47

Example of conservation of momentum?

Answer 47

Two object collide, total momentum before collision is equal to total momentum after