2. Mechanics Flashcards Preview

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Flashcards in 2. Mechanics Deck (22)
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1
Q

Instantaneous speed

A

The speed of an object at an instant in time; the rate of change of position with respect to time.

2
Q

Average speed

A

the average speed over the whole journey = total distance/total time

3
Q

Acceleration

A

The rate of change of velocity with respect to time.

4
Q

Air resistance

A

The transfer of energy into the fluid from an object moving in it.

5
Q

Translational equilibrium

A

When there is no resultant force acting on an object and therefore it is stationary or moving at a constant velocity.

6
Q

Newton’s first law of motion

A

An object continues to remain stationary or to move at a constant velocity unless an external force acts on it.

7
Q

Inertia

A

The property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.

8
Q

Newton’s second law of motion

A

force = mass * acceleration

9
Q

Newton’s third law of motion

A

Every action has an equal and opposite reaction.

10
Q

Static friction

A

the friction when there is no relative movement between the surfaces.

11
Q

Dynamic friction

A

the friction when there is relative movement between the surfaces.

12
Q

Kinetic energy

A

the energy an object has because of its motion.

13
Q

Gravitational potential energy

A

the energy an object has because of its position in a gravitational field.

14
Q

Elastic potential energy

A

energy stored as a result of the deformation of an elastic object/the work done to stretch the spring.

15
Q

Work done

A

force exerted * distance moved in the direction of the force

16
Q

Power

A

the rate of energy transfer

17
Q

Principle of conservation of energy

A

energy cannot be created or destroyed, only transferred form one form to another.

18
Q

Momentum

A

the product of the mass of the object and its instantaneous velocity.

19
Q

Impulse

A

change in momentum = force*t

20
Q

Collision

A

an interaction where momentum transfers.

21
Q

Principle of conservation of momentum

A

Momentum is always constant if no external force acts on a system.

22
Q

Elastic collision

A

A collision where kinetic energy is conserved.