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Physics GCSE > Simple Mechanics (9) > Flashcards

Simple Mechanics (9) Flashcards

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1
Q

Standard unit for length:

A

Length = M (meter)

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2
Q

Standard unit for energy:

A

Energy = J (Joule)

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3
Q

Standard unit for force:

A

Force = N (Newton)

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4
Q

Standard unit for time:

A

Time = S (seconds)

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5
Q

Standard unit for speed:

A

Speed = M/S (meters per second)

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6
Q

How do you find the distance travelled on a velocity time graph

A

Find the area underneath the graph

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6
Q

If an object was accelerating then how would it be displayed on a velocity time graph

A

Diagonal line pointing up

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7
Q

If an object was travelling at a constant speed then how would it be displayed on a velocity time graph

A

Horizontal line

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8
Q

Area of a triangle

A

Area = 1/2 x base x height

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9
Q

What is acceleration

A

A measure of how fast the speed of an object increases

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11
Q

What is the equation for acceleration

A

Change of speed/Time taken

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12
Q

How do you find out the change of speed

A

Final speed — starting speed

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13
Q

Symbol equation for acceleration

A

v — u
A= ———
t

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13
Q

Definition of speed

A

A measurement of how quickly something moves

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14
Q

What is the unit for acceleration

A

[M/S2]

Meters per second squared

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15
Q

When do we use use average speed

A

If a journey does not happen at a constant speed we often quote the average speed for the journey

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17
Q

Equation for average speed

A

Total distance travelled/Total time taken

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18
Q

Equation for velocity

A

Displacement (distance + direction)/time

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19
Q

Equation for average velocity

A

Total displacement (distance + direction)/total time

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19
Q

What is velocity

A

Velocity is a measure of speed in a particular direction

20
Q

Equation for average acceleration

A

Change in Velocity/change in time

22
Q

What is a scalar

A

A scalar is a measurement where direction doesn’t matter

22
Q

State 3 vectors

A 
Velocity
Displacement
Force
Acceleration
Gravity
23
Q

What is a vector

A

A vector is a measurement which has a direction

24
Q

State 3 scalars

A 
Speed
Distance
Time
Energy
Pressure
Mass
Area
26
Q

What is terminal Velocity

A

The maximum speed at which falling objects can reach where the can no longer accelerate

27
Q

Why does terminal Velocity occur

A

Because the air resistance increases until the air resistance and the weight balance until the resultant force is 0. The object then hits the ground and stops

28
Q

On the moon there is no ___

However there is a bit of _______

A

On the moon there is no air

However there is gravity

29
Q

There is 6 times more gravity on the earth than the _______

A

Moon

29
Q

What is the opposite of the force ‘thrust’

A

Drag

30
Q

There is no ____ _________ on the moon therefore a hammer and a feather would fall to the ground at the same time

A

Air resistance

31
Q

Forces cannot be seen but we can see or feel their _______

A

Effects

32
Q

Forces are drawn as ______

A

Arrows

34
Q

To show big forces we draw _____ ________

A

Big arrows

34
Q

Are forces scalars or vectors

A

Vectors

35
Q

To show little forces we draw ________ ________

A

Small arrows

36
Q

Name 3 types of force

A 
Weight
Friction
Push
Pull
Magnetic
Driving/thrust
Nuclear
Electrostatic
37
Q

State 2 effects of force

A 
Produce movement
Slow objects down
Produce sound 
Produce heat
Change shape of objects
Change direction of objects
38
Q

What is the resultant force

A

This is a single force which is the sum of all the actual forces on an object

39
Q

If an object is in contact with a surface there will be a ______ _______ force

A

Normal contact force

40
Q

If all forces balance then the resultant force is __

A

0

41
Q

If the resultant force is 0 then the object is either ______ or ______

A

At rest
OR
Moving at a constant speed

42
Q

If a resultant force does exist then the object will either ________ or ________

A

Accelerate
OR
Decelerate
This is Newton’s first law

43
Q

What are projectiles

A

Objects with both vertical and horizontal velocity

44
Q

Friction is essential in some situations but in others it _________ energy and causes wear

A

Wastes

45
Q

If you push a ball off a flat surface then the horizontal velocity _______ change at any point (if we ignore resistance)

A

If you push a ball of a flat surface then the horizontal velocity DOES NOT change at any point (if we ignore resistance)

46
Q

For a particular object, the bigger the unbalanced force acting on it, the bigger the ____________

A

Acceleration

48
Q

If the same force is applied to objects of different mass then the more massive object the will have a __________ rate of acceleration

A

Smaller

Physics GCSE (22 decks)

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