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P2 > 1-Forces > Flashcards

1-Forces Flashcards

0
Q

What is the resultant force?

A

The sum of different forces acting on the same object.

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1
Q

What is Newton’s third law?

A

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

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2
Q

What is the force called when the resultant force is zero?

A

The forces are balanced.

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3
Q

What is the force called when the resultant force is not zero?

A

The forces are unbalanced.

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4
Q

What happens when the resultant force is zero on a stationary car?

A

It will remain stationary.

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5
Q

What happens when the resultant fore is zero on a moving car?

A

It will continue at the same constant speed in the same direction.

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6
Q

What happens if the resultant force is unbalanced on a stationary car?

A

It will accelerate in the direction of the resultant force.

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7
Q

What happens if the resultant force is unbalanced on a moving car?

A

It will accelerate in the direction of the resultant force; making it slow down, speed up or change direction.

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8
Q

What does the acceleration of a object depend on?

A

The size of the unbalanced force (the bigger the force the greater the acceleration)
The mass of the object (the bigger the mass the smaller the acceleration)

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9
Q

What are the two things you need to work out the speed of an object?

A

The distance it travels.

The time taken to travel that distance.

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10
Q

What does the gradient of a distance time graph represent?

A

The speed of an object.

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11
Q

What is velocity?

A

Speed in a given direction.

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12
Q

What is acceleration?

A

The rate at which velocity changes.

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13
Q

What two things do you need to work out the acceleration?

A

The change in velocity.

Time taken for change in velocity.

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14
Q

If a cyclist increases his velocity by the same amount every second, what happens to the distance?

A

The actual distance travelled each second increases.

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15
Q

What is deceleration?

A

Negative acceleration, an object slowing down.

16
Q

What does the slope of a velocity-time graph represent?

A

The acceleration if an object.

17
Q

What does the area underneath the line on a velocity-time graph represent?

A

The total distance travelled.

18
Q

How does a vehicle stop?

A

By losing all of its kinetic energy.

19
Q

What would need a longer stopping distance a car travelling at a fast speed or one at a slow speed?

A

A car travelling at a fast speed.

20
Q

Which will need a larger braking force to stop a car travelling at a fast speed or one at a slow speed?

A

A car travelling at a fast speed.

21
Q

What is the thinking distance?

A

The distance travelled between when the driver sees they need to stop until they actually apply the brakes.

22
Q

What is the braking distance?

A

The distance travelled between when the driver applies the brakes and the vehicle stops.

23
Q

What factors affect thinking distance?

A

Slower reaction time caused by:
Tiredness
Influence of drugs/alcohol
Being distracted eg. Mobile phone or passengers

24
Q

What factors affect braking distance?

A 
Weather:
Wet/icy 
Poor condition if vehicle:
Brakes
Tyres
25
Q

What factors affect both thinking and breaking distance?

A

The speed of the vehicle.

26
Q

What two forces do falling objects experience?

A

Downward force of weight, which always stays the same.

Upwards force if air resistance or drag.

27
Q

Parachute

A

Go revise it yourself

28
Q

What is terminal velocity?

A

When the resultant force of a falling object is zero and its falling speed becomes constant.

29
Q

What is the Earth’s gravitational field strength?

A

10 N/kg.

30
Q

Why are cars designed to be streamlined?

A

To make then more fuel efficient by reducing drag.

31
Q

What do elastic objects do when a force is removed from them?

A

Recover their original shape.

32
Q

How do elastic objects store energy?

A

By storing it as elastic potential energy.

33
Q

Give two examples of elastic objects.

A

A longbow.

A spring toy.

34
Q

What is Hooke’s law?

A

The extension of an elastic object is directly proportional to the force applied until the limit if proportionality is reached.

P2 (6 decks)

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