# P2 : Forces and Their Effects - Flash Cards [H]

- Created by: Ishfaq Azad
- Created on: 17-01-13 20:08

The gradient on Distance-Time graphs equals?

Speed.

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A flat line on Distance-Time graphs means what?

The object is at a stationary position.

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A straight line going uphill or downhill on Distance-Time graphs means what?

The object is travelling at a steady speed.

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The steeper the line on Distance-Time graphs means what?

The object is going faster.

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Downhill sections on Distance-Time graphs means what?

The object is going back to it's starting point.

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Curves on Distance-Time graphs means what?

The object is either accelerating or de-accelerating.

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The gradient on Velocity-Time graphs equals what?

Acceleration.

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Flat sections on Velocity-Time graphs mean what?

The object is at a steady speed.

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The steeper the graph on Velocity-Time graphs mean what?

The object's acceleration or de-acceleration is greater.

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Uphill sections on Velocity-Time graphs mean what?

Acceleration.

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Downhill sections on Velocity-Time graphs mean what?

De-acceleration.

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The area under any section on Velocity-Time graphs mean what?

The distance travelled by the object - in that time interval.

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A curve on Velocity-Time graphs mean what?

The object is changing it's acceleration.

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Two important effects of gravity are?

1) Gives everything weight. 2) On Earth, it gives everything the acceleration of 10m/s², towards the ground.

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Define Mass:

Mass is the amount of 'stuff' in an object (This will be the same anywhere in the universe).

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Define Weight:

Weight is mass when pulled by a gravitational force.

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What are the units for WEIGHT and MASS?

Weight is in newtons (N) as it'x a force & Mass is measured in kilograms (Kg) as it isn't a force.

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What is the resultant force on a object when it is stationary?

Zero.

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There is no resultant force on a moving object. Describe the velocity:

The object is moving at a constant velocity.

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There is a non-zerp resultant force on a object. Describe the movement of the object:

The object is either accelerating or de-accelerating in the direction of the force.

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Describe the forces, when two objects interact:

The forces they exert on each other are equal and opposite.

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If an object has a force acting on it, what force will always make the object slow down and stop?

Friction.

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What are the names of the resistive forces?

Resistance or Drag (Air or Liquid).

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When speed increases, what happens to the drag?

It also increases.

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What is the relation between the following: Braking Distance, Stopping Distance and Thinking Distance.

Thinking distance plus Braking Distance equals Stopping Distance.

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What factors affect thinking distance?

Tiredness, Drugs, Alcohol, Careless Attitude and Distractions.

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What factors affect braking distance?

The quality of brakes, the quality of tyres and the surface which is being driven on: Obstacles (Leafs) and Weather Conditions.

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What happens when a force moves an object through a distance?

Energy is transferred and work is done.

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When the height of an object is increased, what happens to it's Gravitational Potential Energy?

It also increases.

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What is the energy of Movement?

Kinetic Energy.

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Work Done to an Elastic Object is Stored as what?

Elastic Potential Energy.

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The extension of an elastic object is directly proportional to what?

It is proportional to the load or force applied.

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Power is the rate of what?

Energy transferred or Work Done, in seconds.

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What is the measurement units for Power?

Watts (W)

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What designs are put in place to increase the safety in a car crash?

Crumple Zones, Side Impact Bars, Seat Belts and Air Bags.

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What are the units for Momentum?

Kg m/s

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## Other cards in this set

### Card 2

#### Front

A flat line on Distance-Time graphs means what?

#### Back

The object is at a stationary position.

### Card 3

#### Front

A straight line going uphill or downhill on Distance-Time graphs means what?

#### Back

### Card 4

#### Front

The steeper the line on Distance-Time graphs means what?

#### Back

### Card 5

#### Front

Downhill sections on Distance-Time graphs means what?

#### Back

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