# Physics - Forces and their effects

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What do we use the resultant force for?
To determine the movement of an object.
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When all forced are balanced what is the resultant force?
Zero.
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When the resulatnt force is zero what happens to a stationary object?
The object remains stationary.
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When the resultant force is zero what happens to a moving object?
The object reamins moving at the same speed (in the same direction).
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When an object accelerates it goes in the direction of what?
The resultant force.
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The resultant force of an object was 5 Newtons, it's acceleration was 12m/s squared. The rsultant force double, what is it's new acceleration?
24m/s squared.
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The mass of an object was 25 Newtons, it's acceleration was 58m/s squared. The mass doubles, what is it's new acceleration
29m/s squared.
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What does the gradient of a distance-time graph represent?
The speed of an object.
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What is the the velocity of an object?
It's speed in a particular direction.
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What does the slope on a velocity-time graph represent?
The acceleration of an object.
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How do we work out the distance travelled on a velocity time graph?
The area under the graph.
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On a velocity-time graph when the line is straight, what does this mean?
The object is stationary.
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On a velocity-time graph when the line is straight but sloped, what does this mean?
The object is moving at a steady speed.
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When will two cars have different velocities?
When they have different speeds, are going in different directions, or both.
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What two factors does the stopping distance depend on?
Thinking distance and braking distance.
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What increases the thinking distance?
Tiredness, distractions or if under influence of alcohol or other drugs.
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What increases the breaking distance?
Speed, condition of the car or weather conditions.
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How do falling objects eventualy reach a terminal velocity?
Their resultant force becomes zero.
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What is weight?
Force downwards caused by gravity.
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What is air resistance?
Force in opposite direction.
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What happens when a skydiver first jumps out of a plane?
What happens when a skydiver first jumps out of a plane?
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What happens next?
As speed gains, air resistance increases. Eventually weight is match by air resistance so the resulatnt force is zero. The skydiver now moves at a steady speed and teriminal velocity.
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## Other cards in this set

### Card 2

#### Front

When all forced are balanced what is the resultant force?

Zero.

### Card 3

#### Front

When the resulatnt force is zero what happens to a stationary object?

### Card 4

#### Front

When the resultant force is zero what happens to a moving object?

### Card 5

#### Front

When an object accelerates it goes in the direction of what?