Forces and motion

Question 1

MUTANT FLEWW

Answer 1

Magnetic, up thrust, thrust, air resistance, normal contact, tension, friction, lift, electrostatic, weight, water resistance

Question 2

Balanced forces

Answer 2

If forces on an object are balanced its motion will not change so it will either be at a constant speed or stationary

Question 3

DACS

Answer 3

Decelerating, accelerating, constant speed, stationary

Question 4

Resultant force

Answer 4

A single force that has the same effect as all the original forces

Question 5

Free body diagram

Answer 5

The object is drawn as a dot with forces drawn as arrows whose length is proportional to the size and direction of the force

Question 6

Newton’s first law of motion

Answer 6

If the resultant force on an object is zero it remains stationary or at a constant speed

Question 7

Newton’s second law of motion

Answer 7

The acceleration of an object is proportional to the resultant force and inversely proportional to the mass

Question 8

Force equation

Answer 8

F (force in newtons)= M (mass in kg) x a (acceleration in m/s squared)

Question 9

Newton’s third law of motion

Answer 9

Whenever two objects interact the forces they exert on each other are equal and opposite

Question 10

Inertia

Answer 10

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

Question 11

Drag force

Answer 11

Drag forces increase as the speed of an object increases because it is colliding with more particles each second

Question 12

Terminal velocity

Answer 12

The speed of an object when the drag force has become balances with the force making it accelerate, it is the objects top speed

Question 13

Streamlining

Answer 13

If an object is made more streamlined then the drag force will lower at any given speed and it will have a higher top speed

Question 14

Driving force

Answer 14

Driving force increases with mass.

Question 15

Work done

Answer 15

When a force causes an object to move through a distance work is done on the object and energy is transferred

Question 16

Reducing friction

Answer 16

Work done against friction can be reduced by lubrication

Question 17

1 Joule

Answer 17

One Joule of work is done when a force of one newton moved an object one metre

Question 18

Energy equation

Answer 18

W (energy in joules) = F (force in N) x S (distance in m)

Question 19

Hooke’s law

Answer 19

The extension of a spring is directly proportional to the force applied, provided that the limit of proportionality is not exceeded

Question 20

Hooke’s law equation

Answer 20

F (force in N)= k (spring constant in N/m or cm) x e (extension in m or cm)

Question 21

Extension

Answer 21

Displacement from equilibrium

Question 22

Equilibrium

Answer 22

Balance between opposing forces

Question 23

Typical speeds

Answer 23

Walking= 1.5 m/s Running= 3m/s Cycling= 6m/s Car= 30m/s

Question 24

What does the gradient of a distance-time graph represent

Answer 24

Speed

Question 25

If the gradient is what the speed is what

Answer 25

Constant

Question 26

If the gradient is increasing the object is what

Answer 26

Acccelerating

Question 27

Velocity as a vector

Answer 27

Velocity is a vector quantity meaning is has magnitude AND DIRECTION

Question 28

Positive to negative gradient

Answer 28

Means there has been a direction change

Question 29

Displacement

Answer 29

Distance and direction from a specific point, it is a vector quantity

Question 30

Instantaneous speed

Answer 30

Determined by drawing a tangent at a particular point and calculating the gradient

Question 31

Acceleration

Answer 31

The rate of change of velocity

Question 32

Distance in a velocity-time graph

Answer 32

The area underneath the graph is equal to the distance

Question 33

Gradient in a velocity-time graph

Answer 33

Represents acceleration

Question 34

Acceleration equation when speed is given

Answer 34

a (m/s squared)= ΔV (final-initial velocity) /t (time)

Question 35

Acceleration equation when distance is given

Answer 35

v^2 (final velocity)- u^2 (initial v)= 2 x a (acceleration) x s (spatium)

Question 36

Moments

Answer 36

A moment is the turning affect of a force about a pivot

Question 37

Moment equation

Answer 37

F (force, N) x d (distance, m)= M (moment, N.m)

Question 38

The further away from the pivot the what

Answer 38

The bigger the moment

Question 39

Gears

Answer 39

Gears allow motion created by moments to be transferred directionally and at different speeds by altering gear sizes- they can also increase the rotating effect

Question 40

How is the moments equation used with gears

Answer 40

Distance is the radius of the gear, force or moment will be given- remember to convert to metres

Question 41

Indirect proportion in gears

Answer 41

Speed of rotation is indirectly proportionate to the size of the gear

Question 42

Resultant force in multiple directions

Answer 42

Calculate the hypotenuse (resultant force line) using Pythagoras or trigonometry if the angle is asked for