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Additional Physics From Hell > Forces > Flashcards

Forces Flashcards

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1
Q

What is happening if the resultant force is 0 on a stationary object

A

It stays stationary

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2
Q

What is the resultant force

A

The sum of the forces

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3
Q

What happens to a moving object if the resultant force is 0?

A

It keeps moving at a constant speed

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4
Q

What happens when the forces aren’t balanced in a stationary object

A

It begins to move in the direction of the resultant force

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5
Q

What happens to a moving object when the resultant force isn’t 0

A

It accelerates or slows down depending on the direction of the resultant force

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6
Q

What does acceleration depend on?

A

Size of the force

The mass

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7
Q

What is acceleration measured in?

A

M/s2

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8
Q

What is velocity measured in?

A

M/s

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9
Q

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

A

The area under the graph is the total distance travelled

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10
Q

What is Newton’s first law?

A

Object stays still unless acted on by unbalanced forces

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11
Q

What is Newton’s third law?

A

If a body exerts a force on another, there is an equal and opposite force

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12
Q

What is force measured in?

A

N Newton’s

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13
Q

When there is a horizontal line on a velocity time graph, what does that mean?

A

Object is moving at a constant speed

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14
Q

When there is a horizontal line on a distance time graph, what does that mean?

A

Object is stationary

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15
Q

When there is a straight diagonal line going up on a distance time graph, what does that mean?

A

Object is moving at a steady speed (constant speed)

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16
Q

When there is a straight diagonal line going up on a velocity time graph, what does that mean?

A

Object is moving at a constant acceleration

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17
Q

When there is a curved line going up on a distance time graph what does that mean?

A

Object is accelerating

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18
Q

When there is a curved line going down in a distance time graph what does that mean?

A

Object is decelerating

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19
Q

When there is a curved line going up on a velocity time graph, what does that mean?

A

Increased rate of acceleration

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20
Q

When there is a curved line on a velocity time graph going down, what does that mean?

A

Increased rate of deceleration

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21
Q

When there is a diagonal line going down on a velocity time graph what does that mean?

A

Constant deceleration of object

22
Q

When there is a diagonal line going down on a distance time graph, what does that mean?

A

Object is travelling at a steady speed (constant speed) back to the start

23
Q

The steeper the Line…

A

The greater the acceleration

24
Q

How do you calculate the gradient?

A

Rise/run

25
Q

What does working out the gradient represent on a velocity time graph

A

The acceleration

26
Q

What does the stopping distance of a car depend on ?

A

Thinking distance and braking distance

27
Q

What 5 forces act on a car moving at a steady speed?

A 
Weight
Reaction force 
Driving force 
Friction
Air resistance
28
Q

Which force on a car is pointed down?

A

Weight (gravity)

29
Q

Which force on a car is pointing up?

A

Reaction force

30
Q

Which forces on a car are indirectly proportional?

A

Weight(gravity) and reaction force

Driving force and air resistance

31
Q

Format in drawing resultant force?

A

E.g.

2N^
3N>

32
Q

If the driving force is bigger than the air resistance of a car moving, what is the car doing ?

A

Accelerating

33
Q

For a car to slow down, what has to happen (2)

A

The driving force must be reduced

The resistive forces must be increased

34
Q

How do you work out stopping distance?

A

Stopping distance= thinking distance+breaking distance

35
Q

What is thinking distance?

A

Distance travelling between need for breaking and brakes being pressed

36
Q

What is breaking distance ?

A

Distance taken to stop after brakes have been applied

37
Q

What 3 factors affect thinking distance?

A

Tired
Distracted
Influence from drugs and alcohol

38
Q

What 2 factors affect breaking distance?

A

The cars tyres or brakes are in poor condition

Weather conditions I.e. Icy roads

39
Q

What happens when the braking distance increases?

A

Car’s speed increases

40
Q

What happens when brakes are applied to a car? (3)

A

Work is done by the friction force

Kinetic energy of the vehicle is reduced because the speed decreases

Increases temperature of the brakes

41
Q

What is terminal velocity ?

A

When the resultant force is 0

42
Q

What are the main 2 forces exerted on falling objects ?

A

Weight(gravity)

Air resistance

43
Q

What are the 3 stages of falling (3)

A

Since in1) object accelerates downwards
No air resistance

2) air resistance increases and becomes bigger than the weight/ force
3) the object’s weight and air resistance is balanced. It reaches a steady speed called terminal velocity

44
Q

Why does a coin fall faster than a feather ?

A

The feather is lighter so air resistance increases quickly and it falls at terminal velocity

The coin is heavier so it travels fast before air resistance is large enough to balance the weight. So, it probably hits the ground before terminal velocity

45
Q

On the moon, what happens when you drop a light object and a heavy object and why?

A

They land at the same time.

The moons gravity is too weak so there is no air resistance. Therefore, the objects had the same acceleration

46
Q

On a velocity time graph for falling objects, when a line is horizontal, what does it mean?

A

Object has reached terminal velocity

47
Q

What are the 3 stages of dropping something?

A

1) object accelerates because the force of gravity is bigger than friction force
2) it is still accelerating but acceleration decreases as friction is increasing
3) it stops accelerating and reaches terminal velocity

48
Q

What is the difference between weight and mass ?

A

Weight is the result of gravity and is the force acting on mass. measures in N

Mass is how much stuff is in an object measure in kg

49
Q

What do elastic objects do?

A

Store elastic potential energy when stretched

50
Q

What is the relationship between the extension of an elastic object and the force applied?

A

They are directly proportional

51
Q

What is the spring constant measured in?

A

N/m

52
Q

The greater the spring constant…

A

The greater the value of K so the stiffer the spring

Additional Physics From Hell (5 decks)

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