Balanced and unbalanced Flashcards
What is a force?
A force is an influence that causes an object to change
What are the units of force?
The units of all forces are newtons (N)
What happens if the resultant force on a car is in the direction in which it is traveling?
If the resultant force on a car is in the same direction as the car is traveling it will speed up.
Are the forces balanced or unbalanced when a Formula 1 car is accelerating from the starting grid?
The car is accelerating. There is an unbalanced force acting.
Are the forces balanced or unbalanced when a cyclist uses his brakes?
When the brakes are applied the speed of the cyclist decreases. There is an unbalanced force acting.
Are the forces balanced or unbalanced when a lorry is driving at a constant speed down a straight road?
The speed of the lorry is constant and the direction in which the lorry is travelling does not change. Therefore the forces acting on the lorry must be balanced.
The arrows in this diagram represent the sizes of forces acting on a stationary tennis ball. What will happen to the tennis ball?
It will start to move downwards
What can we say about the forces on an object that is not moving?
If an object is not moving, the forces must be balanced.
What happens to the air resistance on a car as the car goes faster?
As a car goes faster, air resistance increases.
What is the resultant force?
The size of the overall force acting on an object is called the resultant force. If the forces are balanced, this is zero.
As a car drives along the road which 3 forces are acting on it?
Engine force, Air resistance and Friction
Why do racing cyclists crouch down low on their bikes?
To reduce the air resistance on them. This helps them to cycle faster.
Which force stops a boat from sinking?
Upthrust
What happens when two forces act in the same direction?
When two forces act in the same direction you need to add these two forces together. The overall force is the net force acting on the object.
Draw and name the forces acting on a rocket as it takes off
Draw and name the forces acting on a boat floating in the water
