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Physics Unit 2 > 2.1 Forces and Their Effects > Flashcards

2.1 Forces and Their Effects Flashcards

1
Q

What happens to an object if its resultant force is not 0?

A

The object will accelerate in the direction of the force

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2
Q

What happens to an object if its resultant force is 0?

A

It’s acceleration will remain the same.

If it’s stationary, it will remain stationary.

If it’s moving, it will continue to move with the same velocity.

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3
Q

What is the unit of acceleration?

A

m/s2 (metres per second squared)

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4
Q

What is the unit for mass?

A

N (Newtons)

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5
Q

What is the unit for force?

A

N (Newtons)

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6
Q

What is the unit for weight?

A

Kg (Kilogram)

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7
Q

What does the gradient of a distance-time graph represent?

A

Speed

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8
Q

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

A

Acceleration

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9
Q

What is the thinking distance?

A

How far the car travels between the driver seeing something and pressing the brakes

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10
Q

What is the braking distance?

A

How far a car travels form when a car’s brakes are applied until it’s stopped

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11
Q

What is the stopping distance?

A

The thinking distance and breaking distance added together

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12
Q

What affects the thinking distance?

A
  • Tiredness
  • Drugs
  • Alcohol
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13
Q

What affects the braking distance?

A
  • Road conditions
  • Weather conditions
  • Tyre/brake conditions
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14
Q

How do car brakes work?

A

Work done by the friction between the brakes and the wheel causes the wheel to lose kinetic energy and the brakes to gain heat energy.

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15
Q

What force acts against an object falling through a fluid (liquid/gas)?

A

Friction

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16
Q

What is terminal velocity and why is it a thing?

A

The highest velocity possible for a specific object falling through a fluid. Initially the object accelerates because of gravity but eventually the resultant force becomes 0 because the frictional force increases as the velocity increases.

17
Q

What causes an elastic object to change shape?

A

A force being applied to it, this causes it to store elastic potential energy.

18
Q

What is weight and mass?

A

Mass = The amount of stuff in an object

Weight = The pull of gravity on an object making it “weigh” something

Physics Unit 2 (6 decks)

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