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Physics GCSE - P2 > P2.1 - Forces and their effects > Flashcards

P2.1 - Forces and their effects Flashcards

1
Q

Whenever two objects interact, the forces they exert on each other are…

A

Equal and Opposite.

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2
Q

What is a resultant force?

A

When a number of forces are acting on an object, they may be replaced by a single force, the resultant force.

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3
Q

What can an resultant force change about an object?

A

Its state of rest or motion.

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4
Q

What will happen when the resultant force acting on a stationary object is zero?

A

The object will remain stationary.

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5
Q

What will happen when the resultant force acting on a stationary object is NOT zero?

A

The object will accelerate in the direction of the resultant force.

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6
Q

What will happen when the resultant force acting on a moving object is zero?

A

The object will continue to move at the same speed and in the same direction.

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7
Q

What will happen when the resultant force acting on a moving object is NOT zero?

A

The object will accelerate in the direction of the resultant force.

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8
Q

What is the acceleration of an object determined by?

A

The resultant force acting on the object and the mass of the object.

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9
Q

What is velocity?

A

The speed of a object in a given direction.

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10
Q

What are most resistive forces caused by?

A

Air Resistance.

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11
Q

What is stopping distance?

A

The sum of the distance the vehicle travels during the driver’s reaction time (thinking distance) and the distance it travels under the braking force (braking distance).

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12
Q

What can a drivers reaction time be affected by?

A

Tiredness, drugs and alcohol.

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13
Q

What happens when the brakes are applied?

A

Work done by the friction force between the brakes and the wheel reduces the kinetic energy of the vehicle and the temperature of the brakes increase.

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14
Q

What factors can affect braking distance?

A

Adverse road and weather conditions (including wet or icy conditions) and poor condition of the vehicle.

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15
Q

The faster an object moves through a liquid…

A

…the greater the frictional force that acts on it.

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16
Q

What happens to objects when they fall through fluids?

A

The object will initially accelerate due to the force of gravity. Eventually the resultant force will be zero and the object will move at its terminal velocity (steady speed)

17
Q

How can a force acting on an object change it?

A

The force can cause a change in shape.

18
Q

What happens when force is applied to an elastic object, such as a spring?

A

It will result in the object stretching and storing elastic potential energy.

19
Q

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

A

The extension of an elastic object is directly proportional to the force applied, provided that the limit of proportionality is not exceeded.

Physics GCSE - P2 (6 decks)

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