Forces

Question 1

What does a vector quantity (arrow) show?

Answer 1

Direction of force

Question 2

What does arrow magnitude (size) show?

Answer 2

Size of force

Question 3

There are two types of forces:

Answer 3

Contact and Non-Contact

Question 4

Give 4 contact forces

Answer 4

Friction, air resistance, tension, normal contact force

Question 5

Give 3 non-contact forces

Answer 5

Gravitational force, electrostatic force, magnetic force

Question 6

What is the acceleration due to gravity?

Answer 6

9.8 m/s

Question 7

How do we calculate weight?

Answer 7

Mass x Gravitational field strength

Question 8

What is a resultant force?

Answer 8

All forces acting on an object displayed as one

Question 9

Work done =

Answer 9

Force x Distance

Question 10

How many newton-metres is equal to one joule

Answer 10

1

Question 11

Give the equation relating spring constant, force and extension

Answer 11

Force = spring constant x extension

Question 12

Elastic potential energy =

Answer 12

0.5 x spring constant x extension^2

Question 13

What is the turning effect of a force called?

Answer 13

The moment

Question 14

Moment of a force =

Answer 14

Force x distance from pivot point

Question 14

What is the moment clockwise always equal to?

Answer 14

Moment anticlockwise

Question 15

If force is applied further from the pivot point, is more or less force required?

Answer 15

Less force is required

Question 16

What is it called when forces are balanced?

Answer 16

Equilibrium

Question 17

What angle must the distance from pivot point be measured at?

Answer 17

90 degrees

Question 18

What is the name of the gear that we put force through?

Answer 18

Driver gear

Question 19

What is the name of the gear that does not get force put through directly?

Answer 19

Driven gear

Question 20

What does a gear do?

Answer 20

Transmit rotational effects of forces with interlocking teeth

Question 21

How do we calculate the number of turns completed by a gear?

Answer 21

Number of ‘ticks’ / Number of teeth

Question 22

What turning effect is present with a low gear?

Answer 22

High turning effect (easy to turn)

Question 23

What turning effect is present with a high gear?

Answer 23

Low turning effect (hard to turn)

Question 24

Simple equation for pressure =

Answer 24

Force / Area

Question 25

What is an upward force within a fluid called?

Answer 25

Upthrust

Question 26

Complex equation for pressure =

Answer 26

Height of the column × density of the liquid × gravitational field strength

Question 27

Does the atmosphere get less dense or more dense when altitude increases?

Answer 27

Less dense

Question 28

Air molecules colliding with a surface create ...

Answer 28

Atmospheric pressure

Question 29

Does atmospheric pressure decrease or increase with an increase in height?

Answer 29

Decrease

Question 30

What happens to the number of air molecules as they get further away from ground level?

Answer 30

Decrease

Question 31

What is displacement?

Answer 31

The distance travelled and the direction of a straight line as one vector quantity

Question 32

Give the typical value for walking, running and cycling speed

Answer 32

1.5 m/s 3 m/s 6 m/s

Question 33

Give the equation involving initial and final velocity squared

Answer 33

Final velocity^2 - Initial velocity^2 = 2 x distance x acceleration

Question 34

Define terminal velocity

Answer 34

Maximum speed a falling object can reach

Question 35

What is Newton's 1st law?

Answer 35

If the resultant force on an object is 0 and the object is stationary, it remains stationary. If the object is moving it will continue to move at the same velocity

Question 36

What is Newton's 2nd law?

Answer 36

The acceleration of an object is proportional to the resultant force acting on the object

Question 37

What is Newton's 3rd law?

Answer 37

When two objects interact, they exert an equal and opposite force on one another

Question 38

What is stopping distance?

Answer 38

Thinking distance x braking distance (how long it takes to react x how long it takes to stop)

Question 39

When driving at 30mph, what is the average thinking distance?

Answer 39

9 metres

Question 40

What factors affect braking distance?

Answer 40

Poor road conditions, poor vehicle condition and speed of vehicle

Question 41

What can too great of braking force result in?

Answer 41

Overheating and loss of control

Question 42

Give the equation for momentum

Answer 42

Momentum = mass x velocity

Question 43

What is the conservation of momentum?

Answer 43

Total momentum before event is equal to total momentum after an event

Question 44

Equation for change in momentum

Answer 44

Force x time

Question 45

What is air resistance?

Answer 45

The number of air particles an object collides with every second

Question 46

What is momentum?

Answer 46

How hard it is to stop an object

Question 47

What is the unit for momentum?

Answer 47

Kgm/s (kilogram metres per second)