# P8-P11

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- Created by: emmalouise0219
- Created on: 13-03-18 16:57

What is displacement?

Distance in a given direction.

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What is the difference between a vector and a scalar quantity?

Vectors have direction as well as magnitude.

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What is Newton's third law of motion?

When two objects interact they exert equal and opposite forces onto each other.

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What is Newton's first law of motion?

If the forces acting on an object are balanced, then the resultant force should equal zero.

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What is meant by the term resultant force?

The sum of all the forces acting on an object.

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Describe what is meant by the centre of mass.

The point on an object where its mass is the most concentrated.

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Why do we use a paralellogram of forces?

To find the resultant of two forces which don't act along the same line.

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How do calculate distance travelled?

The speed multiplied by the time.

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How can we use the gradient on a distance-time graph?

To find the speed of the object at any given time.

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State the equation for acceleration.

Change in velocity/time taken.

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What is velocity?

Speed in a given direction.

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What is deceleration?

The change in velocity per second as an object slows down.

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How do you calculate distance from a velocity-time graph?

By finding the area underneath the graph.

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What is Newton's second law of motion?

The acceleration of object is proportional to its resultant force and inversely proportional to its mass.

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State the equation linked to Newton's second law.

Resultant force= acceleration x mass.

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What is meant by inertia?

The tendency of an object to stay at rest or continue at a constant velocity.

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Define inertial mass.

Force/acceleration.

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What is terminal velocity?

The maximum speed of an object when the forces acting on it are balanced.

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Describe the three stages of falling.

1. The object accelerates downwards. 2. As the object's speed increases, so does the air resistance. 3. The object reaches terminal velocity, where its weight is balanced and its resultant force is zero.

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How do you work out the stopping distance of a vehicle?

Thinking distance + braking distance.

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What is meant by the braking distance?

The distance a vehicle travels after the brakes are applied.

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What factors can affect reaction time?

Tiredness, use of drugs, alcohol and distractions.

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Describe what happens when the brakes are applied in a vehicle?

When a force is applied to the brakes, there is work done by the friction between the brakes and the wheel. This reduces the kinetic energy of the vehicle, slowing it down and causing the temperature of the brakes to increase.

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What can happen when a vehicle decelerates too abruptly?

The brakes could overheat and cause the driver to lose control of the vehicle.

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If a vehicle was travelling at 40mph, what would be an accurate stopping distance?

36m.

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What is momentum?

The tendency of an object to keep moving in the same direction.

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How do calculate momentum?

Mass x velocity.

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What is the unit for momentum?

Kg m/s

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Describe what is meant by the term conservation of momentum.

Where an object's momentum is the same after collison as before collision.

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How can you calculate force using momentum and time?

Dividing change in momentum by time.

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What features do vehicles have to absorb kinetic energy during collisions?

Seat belts, air bags and crumple zones.

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State the equation which is linked to Hooke's law.

Force= spring constant x extension.

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What is the relationship between force and extension?

The extension is directly proportional to the force applied.

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What is the purpose of a wave?

To transfer energy without transfering matter.

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Describe the difference between a transverse wave and a longitudnal wave.

Transverse waves oscilate perpendicular to the direction of energy transfer, whereas longitudnal waves transfer energy paralell to the direction of energy transfer.

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What are the main properties of a wave?

Frequency, wavelength, amplitude and wavespeed.

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Define amplitude.

The maximum displacement of a point of a wave from its rest position

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What is the unit for frequency?

Hertz.

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How do you calculate wavespeed?

Frequency x wavelength.

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How are time period and frequency linked?

Period= 1/frequency.

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## Other cards in this set

### Card 2

#### Front

What is the difference between a vector and a scalar quantity?

#### Back

Vectors have direction as well as magnitude.

### Card 3

#### Front

What is Newton's third law of motion?

#### Back

### Card 4

#### Front

What is Newton's first law of motion?

#### Back

### Card 5

#### Front

What is meant by the term resultant force?

#### Back

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