Forces

Question 1

Scalar

Answer 1

Any quantity that has a magnitude but not a direction

Question 2

Magnitude

Answer 2

A numerical value with units (amount)

Question 3

Vector

Answer 3

Any quantity that has both magnitude and direction

Question 4

Scalar examples

Answer 4

Density, Temperature, Frequency, Wavelength, Power, Potential Difference, Pressure

Question 5

Vector examples

Answer 5

Magnetic field, Velocity, Momentum, Force, Current, Acceleration, Displacement

Question 6

Force

Answer 6

A force can change the shape of an object or change its state of rest or its motion

Question 7

Force Measurement

Answer 7

Newtons (N)

Question 8

Resultant force

Answer 8

The total force and direction

Question 9

Unbalanced forces

Answer 9

Resultant force = x newtons ( distance )

- A stationary object begins to move, a moving object changes speed in the direction of the resultant force

Question 10

Balanced forces

Answer 10

Resultant force = 0

There is no change in speed or direction

Question 11

Terminal velocity

Answer 11

Travelling at a constant speed

Question 12

Load

Answer 12

The weight of an object on a lever

Question 13

Effort

Answer 13

The force applied to a lever

Question 14

Pivot / fulcrum

Answer 14

The turning point on a lever

Question 15

Unit of moments

Answer 15

Newton Meters (NM )

Question 16

Equilibrium of moments

Answer 16

The sum of all the clockwise moments about any point
=
The sum of all the anticlockwise moments about that point

Question 17

Equilibrium of moments equation

Answer 17

F1D1 = F2D2

Question 18

Equation for moments

Answer 18

M = F x D

Question 19

Moments equation triangle

Answer 19

Moment (Nm)

Force(N) Distance from effort to pivot (M)

Question 20

High gear speed

Answer 20

Faster

Question 21

Low gear speed

Answer 21

Slower

Question 22

Gears

Answer 22

Work as a force multiplier. To increase the moment of a turning effect, a small gear wheel needs to drive a larger gear wheel

Question 23

The centre of mass

Answer 23

The central point within an object which can be considered as the centre of mass which the mass acts through

Question 24

Suspended equilibrium

Answer 24

If you suspend an object and release it, it will come to rest with its centre of mass directly below the point of suspension

Question 25

The parallelogram of forces

Answer 25

A scale diagram of two vectors. The resultant force is found by the diagonal between the two vectors, measured to give magnitude and direction.

Question 26

Resolution of forces

Answer 26

Finding the perpendicular components that have a resultant force that is equal to that force

Question 27

Resolving a force

Answer 27

Draw a rectangle with adjacent sides along the two directions, so that the diagonal represents the force vector

Question 28

Line of action

Answer 28

The line directly down from the centre of mass

Question 29

Falling over

Answer 29

When a line of action goes out of the perimeters of the base, the object becomes top heavy and will fall over

Question 30

Speed

Answer 30

S = D/T

Question 31

Stationary distance time graph

Answer 31

A horizontal line

Question 32

Constant speed distance time graph

Answer 32

Sloping upwards line

Question 33

Speed on a distance time graph

Answer 33

The gradient of the line

Question 34

Acceleration or deceleration on a distance time graph

Answer 34

A curved line

Question 35

Velocity

Answer 35

Speed in a given direction

Question 36

Speed

Answer 36

How far something moves in a period of time

Question 37

Acceleration equation

Answer 37

Starting velocity - Final Velocity
Acceleration = _________________________________________
Time taken

A = u - v / t

Question 38

Area under a velocity time graph

Answer 38

The distance travelled

Question 39

Gradient of line on velocity time graph

Answer 39

Acceleration