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GCSE Physics Flash Card Questions

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P10 Force and motion

P10.1 Force and acceleration

Question	Answer
What device is used to measure force?	a newton-meter
What is the relationship between force and acceleration?	force is proportional to acceleration
What is the relationship between mass and acceleration?	mass is inversely proportional to acceleration
State Newton's second law.	the acceleration of an object is   • proportional to the resultant force on the object   • inversely proportional to the mass of the object
State the word equation that relates force, mass and acceleration.	force = mass x acceleration
State the symbol equation that relates force, mass and acceleration.	F = m x a
State the units for   • force   • mass   • acceleration	State the units for   • Newtons (N)   • kilograms (kg)   • metres per second squared (m/s2)
What is inertia?	the tendency of an object to stay at rest or continue in uniform motion
What is required to change the velocity of an object?	a force must act on the object
What is the relationship between the direction of force and acceleration?	they are always in the same direction
What is the relationship between the direction of velocity and acceleration?	• if velocity is increasing, velocity and acceleration are in the same direction • if velocity is decreasing, velocity and acceleration are in opposite directions
What happens to the velocity of an object if its acceleration is in the opposite direction?	velocity is decreasing i.e. the object is slowing down
What happens to the velocity of an object if its acceleration is in the same direction?	velocity is increasing i.e. the object is speeding up
For a given force, what happens to the acceleration of an object, if its mass increases?	acceleration decreases
Calculate the resultant force on an object of mass 4.0 kg when it has an acceleration of 2.5 m/s2.	F = m x a = 4.0 x 2.5 = 10.0 N

P10 Force and motion

P10.2 Weight and terminal velocity

Question	Answer
Why does an object fall when dropped?	because of its weight i.e. the force acting on the object due to gravity
What does it mean when an object is described as falling freely?	there is no force other than weight acting on the object
What is the approximate value of the acceleration due to gravity?	10 m/s2
What is the symbol for the acceleration due to gravity?	g
What causes the weight of an object?	the gravtational force of attraction between the Earth and the object
How does the weight of an object compare at the poles and the equator?	the weight of the object is slightly less at the equator than at the poles
How does the mass of an object compare at the poles and the equator?	it is exactly the same
What is the weight of an object?	the force acting on the object due to gravity
What is the mass of an object?	the quantity of matter in an object
What are the units of weight?	Newtons (N)
What are the units of mass?	kilograms (kg)
Define the gravitational field strength?	the gravitational field strength on a 1kg object
What is gravitational field strength measured in?	Newtons per kilogram (N/kg)
Write the equation for weight.	weight = mass x gravitational field strength?
Write the symbol equation for weight.	w = m x g
What are the units of weight?	newtons (N)
Explain what happens to an object that falls in a fluid	• the weight of the object drags it down into the fluid • the speed of the object increases • the fluid drags on the object due to the friction between the fluid and the object • the friction on the object increases with speed • the acceleration of the object decreases as the friction increases • when the force of friction is equal to the weight of the object, the acceleration will be zero and the object has reached terminal velocity
What is terminal velocity?	the maximum velocity which an object eventually reaches when it is falling i.e. when the resultant force is zero
What is the friction called when an object is dropped in air?	air resistance
What is the resulant force on an object at terminal velocity, falling in air?	weight and air resistance which are equal and in opposite directions so zero

P10 Force and motion

P10.3 Forces and braking

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P10 Force and motion

P10.4 Momentum

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P10 Force and motion

P10.5 Using conservation of momentum (single science only)

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P10 Force and motion

P10.6 Impact forces (single science only)

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P10 Force and motion

P10.7 Safety first (single science only)

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P10 Force and motion

P10.8 Forces and elasticity

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