1-Forces Flashcards
(35 cards)
What is the resultant force?
The sum of different forces acting on the same object.
What is Newton’s third law?
Whenever two objects interact, the forces they exert on each other are equal and opposite.
What is the force called when the resultant force is zero?
The forces are balanced.
What is the force called when the resultant force is not zero?
The forces are unbalanced.
What happens when the resultant force is zero on a stationary car?
It will remain stationary.
What happens when the resultant fore is zero on a moving car?
It will continue at the same constant speed in the same direction.
What happens if the resultant force is unbalanced on a stationary car?
It will accelerate in the direction of the resultant force.
What happens if the resultant force is unbalanced on a moving car?
It will accelerate in the direction of the resultant force; making it slow down, speed up or change direction.
What does the acceleration of a object depend on?
The size of the unbalanced force (the bigger the force the greater the acceleration)
The mass of the object (the bigger the mass the smaller the acceleration)
What are the two things you need to work out the speed of an object?
The distance it travels.
The time taken to travel that distance.
What does the gradient of a distance time graph represent?
The speed of an object.
What is velocity?
Speed in a given direction.
What is acceleration?
The rate at which velocity changes.
What two things do you need to work out the acceleration?
The change in velocity.
Time taken for change in velocity.
If a cyclist increases his velocity by the same amount every second, what happens to the distance?
The actual distance travelled each second increases.
What is deceleration?
Negative acceleration, an object slowing down.
What does the slope of a velocity-time graph represent?
The acceleration if an object.
What does the area underneath the line on a velocity-time graph represent?
The total distance travelled.
How does a vehicle stop?
By losing all of its kinetic energy.
What would need a longer stopping distance a car travelling at a fast speed or one at a slow speed?
A car travelling at a fast speed.
Which will need a larger braking force to stop a car travelling at a fast speed or one at a slow speed?
A car travelling at a fast speed.
What is the thinking distance?
The distance travelled between when the driver sees they need to stop until they actually apply the brakes.
What is the braking distance?
The distance travelled between when the driver applies the brakes and the vehicle stops.
What factors affect thinking distance?
Slower reaction time caused by:
Tiredness
Influence of drugs/alcohol
Being distracted eg. Mobile phone or passengers
