P8- Forces in balance

Question 1

Contact force

Answer 1

The objects are physically touching

Question 2

Non-contact force

Answer 2

The objects are physically separated

Question 3

4 contact forces

Answer 3

Air resistance, normal contact force, friction, upthrust

Question 4

3 non-contact forces

Answer 4

Electrostatic, magnetic, gravitational

Question 5

Newton’s 3rd law

Answer 5

Two objects interacting will have an equal and opposite force on each other

Question 6

Resultant force

Answer 6

Overall motion of the object, depending on the size and direction

Question 7

Newton’s 1st law

Answer 7

An object will remain at rest or in uniform motion unless an external force acts upon it

Question 8

Inertia

Answer 8

The tendency of objects to continue in their state of rest or in uniform motion

Question 9

Distance

Answer 9

How far an object moves, doesn’t involve direction

Question 10

Displacement

Answer 10

The change in position, a straight line from start to finish, with direction

Question 11

Vector def?

Answer 11

Quantity that has magnitude and a direction

Question 12

Scalar def?

Answer 12

Quantity that has magnitude but no direction

Question 13

5 vector quantities

Answer 13

Displacement, velocity, acceleration, force, weight

Question 14

7 scalar quantities

Answer 14

Temperature, mass, speed, energy, time, density, distance

Question 15

Moment

Answer 15

The turning effect of a force, in a clockwise /anticlockwise direction

Question 16

Lever

Answer 16

Act as a force multiplier so they reduce the force needed for a task

Question 17

2 ways to increase the moment

Answer 17

-Increase distance from the object
-Increase force on the object

Question 18

Load?
Effort?
Pivot?

Answer 18

Weight of object
Force applied to object
Point object turns about

Question 19

Levers in an arrangement of
effort-pivot-load

Answer 19

Seesaw, crowbar, scissors

Question 20

Levers in an arrangement of
pivot-load-effort

Answer 20

Wheelbarrow, nutcracker

Question 21

Levers in an arrangement of
pivot-effort-load

Answer 21

Tweezers, tongs

Question 22

Gears

Answer 22

Wheels with toothed edges that rotate around an axle

Question 23

What do gears do

Answer 23

Allow for motion to be translated from one point to another
Increase or decrease the turning effect and speed

Question 24

How to draw a parallelogram of forces

Answer 24

Rotate diagram so it’s horizontal to graph line, must be to scale
Draw the parallelogram
Measure resultant vector with ruler, angle w protractor

Question 25

Speed

Answer 25

A measure of how fast an object is moving

Question 26

Magnitude

Answer 26

The size of a quantity

Question 27

Free-body force diagram

Answer 27

Forces acting on an object with no other objects or forces shown

Question 28

Low gear
Size of gear wheel?
Speed?
Turning effect?

Answer 28

Small gear wheel drives large gear wheel
Gives low speed
High turning effect

Question 29

High gear
Size of gear wheel?
Speed?
Turning effect?

Answer 29

Large gear wheel drives small gear wheel
Gives high speed
Low turning effect

Question 30

What is the centre of mass of an object

Answer 30

The point where the mass is thought to be concentrated

Question 31

What happens to the centre of mass of a suspended object?

Answer 31

It will come to rest with its centre of mass directly underneath the point of suspension

Question 32

What are the moments when an object is in equilibrium

Answer 32

The total clockwise moment is equal to the total anti-clockwise moment