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 in terms of magnitude and direction

Answer 11

Has a magnitude and a direction

Question 12

Scalar in terms of magnitude and direction

Answer 12

Has a 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

Size of a moment depends on 2 things

Answer 17

1. Magnitude of force
2. Distance from the pivot to force applied

Question 18

Levers in an arrangement of
effort-pivot-load

Answer 18

Seesaw, crowbar, scissors

Question 19

Levers in an arrangement of
pivot-load-effort

Answer 19

Wheelbarrow, nutcracker

Question 20

Levers in an arrangement of
pivot-effort-load

Answer 20

Tweezers, tongs

Question 21

Gears

Answer 21

Wheels with toothed edges that rotate around an axle

Question 22

What do gears do

Answer 22

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

Question 23

How to draw a parallelogram of forces

Answer 23

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 24

Speed

Answer 24

A measure of how fast an object is moving

Question 25

Magnitude

Answer 25

The size of a quantity

Question 26

Free-body force diagram

Answer 26

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

Question 27

Low gear
Speed?
Turning effect?

Answer 27

Gives low speed
High turning effect

Question 28

High gear
Speed?
Turning effect?

Answer 28

Gives high speed
Low turning effect

Question 29

What is the centre of mass of an object

Answer 29

The point where the mass is thought to be concentrated

Question 30

What are the moments when an object is in equilibrium

Answer 30

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