# Forces and Acceleration

Also some questions on Newton's Laws of Motion!

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What is Newton's first Law of Motion?
If the resultant force on a stationary object is zero, the object will remain stationary
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What is Newton's second Law of Motion?
If there is no resultant force on a moving object it will just carry on moving at the same velocity
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What is Newton's third Law of Motion?
If there is a non-zero resultant force, then the object will accelerate in the direction of the force
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What is the equation for working out the resultant force?
Resultant force (N) = mass (kg) x acceleration (m/s squared) (F = ma)
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What is the rule for the when forces of two objects interact?
When two objects interact, the forces they exert on each other are equal opposite
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A car of mass 1750kg has an engine which provides a driving force of 5200N. At 70 mph the drag force acting on the car is 5150N. Find its acceleration: a) when first setting off from rest b) at 70 mph
a) Resultant force = 5200N a=F/m = 5200/1750 = 3.0m/s squared b) Resultant force = 5200-5150 = 50N a=F/m = 50/1750 = 0.03 m/s squared
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## Other cards in this set

### Card 2

#### Front

What is Newton's second Law of Motion?

#### Back

If there is no resultant force on a moving object it will just carry on moving at the same velocity

### Card 3

#### Front

What is Newton's third Law of Motion?

### Card 4

#### Front

What is the equation for working out the resultant force?

### Card 5

#### Front

What is the rule for the when forces of two objects interact?