Quantities and Measurements
The units of length, mass and time
meter = m
kilogram = kg
second = s
Total length of the path traveled by an object
Newton's Second Law
F = m x a
Define moment of force
The product of force and perpendicular distance from the pivot to the line of action
Define Energy
The ability of body to do work
Physical quantity that has both magnitude and direction
vector
Define acceleration
Rate of change of velocity
Hooke's Law
F = k x e
(e stands for extension)
No resultant force
No resultant moment
Define Work
The product of force and distance moved in the direction of the force
The eye should look at perpendicular angle to the scale for avoiding ...
parallax error
What does a straight line on a distance-time graph mean?
Uniform Linear Motion
(Motion with constant velocity)
What is the direction and source of a resultant force that acts on a car when it makes a turn?
Towards the center of the circle.
Friction between the tyres and the road.
Principle of moment
Total clockwise moment of object in equilibrium should be equal to total anti-clockwise moment about the pivot
Explain the energy transfer of a falling object
Gravitational potential energy transfers into the kinetic energy of an object and is being dissipated due to air resistance at the same time.
Triangle method & Parallelogram method
Area under speed time graph
Distance moved
Name five different forces:
Weight, Normal, Friction, Tension, Spring, Drag, Thrust
Impulse-Momentum Theorem
An impulse delivered to an object is equal to the change of its momentum
What is efficiency?
The ratio of the useful energy/work/power output from the system to its total energy/work/power input
Vernier caliper precision
0.1 mm
What's the shape of the graph of free fall motion on a distance-time graph?
Parabola
Explain how an object in free fall reaches terminal velocity
Weight remains constant all the time.
Air resistance grows with increase in speed.
Net force is getting smaller, acceleration is decreasing. Eventually, weight and drag force balance each other and object moves at constant speed.
Law AND conditions for conservation of momentum.
Total momentum before collision is equal to total momentum after collision IF there are no external forces acting on the system
Four types of renewable energy
Geothermal, Wind, Hydroelectric, Tidal, Solar, Waves