Dynamics Flashcards
What is the difference between a vector and a scalar?
A scalar is measured in size only whilst a vector is measured in size and direction.
Give three examples of a vector.
-Displacement
-Force
-Velocity
Give three examples of a scalar.
-Distance
-Energy
-Speed
What is the difference between distance and displacement ?
Distance is the total length of the journey and displacement is the shortest path from the start point to the end point.
What does it mean if the acceleration is -3ms-²?
It means that the velocity is decreasing by 3ms-¹ every second.
What are the three ways to describe motion?
-Constant velocity
-Accelerating
-Decelerating
What is used to measure Force?
Newtor Balance
What is the name given to the Force that always acts between two touching surfaces to prevent them moving?
Friction
What is the name for the Force in a stretched rope/wire?
Tension
What is the Force of Gravity?
Weight
What is the gravitational field strength on Earth ?
9.8Nkg-¹
What is Newton’s first law?
An object will remain stationary, or travel at a constant speed, unless after on by an unbalanced force.
What is Newton’s second Law?
If an unbalanced force, acts on a mass, the mass will accelerate.
What is Newton’s third law?
If A exerts a force on B, B will exert an equal but opposite force onto A.
What is the name given to velocity when air friction is equal to weight?
Terminal
True or False?
Total energy at the beginning = Total energy at the end
True
What is Kinetic Energy?
The energy of moving object.
-The work done to accelerate an object of a given mass from rest to its started velocity.
What is Gravitational Potential Energy?
The work done to raise an object of mass to a certain height above its starting point in a gravitational field.
Fill in the blanks [Projectiles]
Horizontally- Constant Horizontal ______.
Vertically- Constant acceleration of ______ downwards.
Velocity.
9.8ms-²
What is a projectile?
An object with both a horizontal and vertical motion.
