Foreces In Balance Flashcards
What is the displacement?
Distance without change in direction.
What are vectors?
Physical quantities that have direction and size
Acceleration weight and gravitational field strength.
Magnitude and direction
What are scalars?
Size but no specific direction
Sped, distance and time.
Just magnitude.
What is a force?
A push or pull that acts on an object because of its interaction with another object.
What is Newton’s Third law?
When two objects interact with each other they exert equal and opposite forces on each other.
A boxer who punches a bag with a force of one hundred Newton’s experiences and equal and opposite force of 100N from the bag.
How does the driving force work on a car?
It pushes the car forward because there is friction between the ground and the tyre of each drive wheel.
The force of the friction of the road on the tyre is the driving force.
The force of the friction of the tyre on the road is in the reverse direction.
What is the resultant force?
The single force that has the same effect as all the forces acting on the object. If the resultant force is zero, the forces acting on the object are balanced.
What is Newton’s first law of motion?
If the forces acting on an object are balanced, the resultant force on the object is zero.
- if the object is at rest, it stays stationary.
- if the object is moving, it keeps moving with the same speed and in the same direction.
What happens if two forces act on an object with zero resultant force?
The forces must be equal to each other and act in opposite directions.
If the forces are unbalanced, what is the resultant force?
Not zero.
Eg when driving a car and the brakes are applied
What is the moment?
The turning effect of the force.
How do you increase the moment?
Increasing the size of the force.
Using a spanner with a longer handle.
What is the equation for working out the moment?
Moment = force x perpendicular distance from the line of action of the force to the pivot.
M=fd
What do gears and levers do?
Multiply the effect of a turning force.
What happens when a low heat is chosen?
A small gear wheel driven by the engine shaft is used to turn a large heat wheel on the output shaft. So the output shaft turns slower than the engine shaft.
Gives a low speed and a high turning effect.
