Martha Edney
Mind Map by , created almost 6 years ago

resultant forces vectors and velocity velocity and acceleration forces and acceleration terminal velocity

Martha Edney
Created by Martha Edney almost 6 years ago
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1 vectors and velocity
1.1 some quantities are vectors and include size as well as direction
1.2 speed=distance/time
1.3 distance time graphs
1.3.1 a small steady incline means something is accelerating
1.3.2 a steep line upwards means it something is travelling at speed
1.3.3 a horizontal line means something is stationary
2 velocity and acceleration
2.1 acceleration is a change in velocity
2.2 slowing down is also an acceleration
2.3 acceleration=change in velocity(m/s) / time taken(s)
2.3.1 a=(v-u) / t a=acceleration v=final velocity u=initial velocity t=time taken
2.4 a velocity time graph shows how the velocity of an object changes with time. The distance can be calculated from the area under the line
2.5 a sloping line means the object is accelerating, a straight line means the object is moving at a constant velocity, a line going downwards means the object is slowing down, the highest point is the objects final velocity
3 resultant forces
3.1 if there is more than one force on a object all the forces can be combined into a resultant force
3.2 a force is a vector quantity, because it has a direction as well as a size
3.3 a free body diagram represents the forces acting on an object
3.3.1 the arrows represent the size of the force
3.4 action and reaction forces need 2 objects
3.4.1 e.g kicking a ball the force from the foot on the ball is the action force. the ball exerts and equal opposite reaction force on the foot
3.5 measured in newtons (N)
4 forces and acceleration
4.1 newtons second law
4.1.1 if the forces on an object are unbalanced 2 things about an object can change. Its speed or direction
4.2 force =mass x acceleration
4.2.1 f=ma
4.3 the greater the force,the greater the acceleration for a constant mass
4.4 the greater the mass , the smaller the acceleration for a constant force
4.5 1kg=1000g
4.6 accelertion =m/s*2
4.7 mass=kg
5 terminal velocity
5.1 weight =mass x gravitational field strength
5.1.1 (N)=newtons
5.1.2 (KG)=kilograms
5.1.3 (N/KG) or (m/s*2)
5.2 earth =9.8 n/kg moon=1.6 n/kg jupiter=25.4 n/kg
5.3 mass=the amount of matter in an object
5.4 weight=the force of gravity on an object

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