# PHYSICS [P2] FLASHCARDS

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What happens to a moving object if the resultant force on it is zero?
It keeps moving
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The same resultant force is applied to three balls. Which ball experience the greatest acceleration?
The one with the lowest mass
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What is the unit of force?
The newton, N
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What happens to a moving object if the resultant force on it is not zero?
It speeds up in the direction of the resultant force
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If we double the resultant force applied to an object, what happens to its acceleration?
It doubles
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What is the equation for density?
Density = mass ÷ volume.
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What unit is Mass measured in?
It is measured in kilograms.
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What is Gravity?
Gravity is a force of attraction between masses.
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What are Balanced Forces?
Forces are balanced when the resultant force is zero.
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What does Newton's First Law mean?
Newton's First Law says that if the forces on an object are balanced then it will carry on as it is.
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What are the Forces on a Stationary Car?
The weight of the car is the force pushing downward on the road. Newton's third law of motion tells us that the weight of the car is opposed by an equal and opposite force pushing upward from the road. The opposing force is called the reactive force
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What is the Thinking Distance?
The thinking distance is the distance the car travels during the driver's reaction time.
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What is Reaction Time?
The reaction time is the length of time between the moment when the driver realizes that the car must be stopped and the moment when they apply (put on) the brakes.
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What Increases the Thinking Distance?
Thinking distance is increased if the reaction time of the driver gets longer because of tiredness, alcohol (or other drugs) or distractions. Common distractions include using a mobile phone or a satellite navigation system (Sat Nav).
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What Decreases the Thinking Distance?
The thinking distance can be decreased by using road signs to warn the driver that they might have to stop soon. The more alert a driver is, the shorter their reaction time, the quicker they can apply the brakes and the smaller is the thinking distan
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What is the Braking Distance?
The braking distance is the minimum distance in which a car can stop once the brakes are put on.
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What is the Braking Distance affected by?
The braking distance is affected by; The velocity of the car, the mass of the car and the condition of the brakes, tyres and road surface.
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What is the equation for total stopping distance?
The total stopping distance = thinking distance + braking distance
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## Other cards in this set

### Card 2

#### Front

The same resultant force is applied to three balls. Which ball experience the greatest acceleration?

#### Back

The one with the lowest mass

### Card 3

#### Front

What is the unit of force?

### Card 4

#### Front

What happens to a moving object if the resultant force on it is not zero?

### Card 5

#### Front

If we double the resultant force applied to an object, what happens to its acceleration?