Force and Motion I

When the handle of the hammer hit on the surface,  the handle stop but the head of the hammer keep on moving downward, owing to the effect of inertia. As a result, hammer head will fit tighter into the hammer. Japanese sumo wrestlers normally have great body mass. This is because the greater mass can … Read more

Mass Mass is defined as the amount of matter. The SI unit of mass is kilogram (kg) Mass is a scalar quantity. Inertia Inertia is the property of a body that tends to maintain its state of motion. Newton’s First Law In the absence of external forces, an object at rest remains at rest and … Read more

Free falling is a motion under gravitational force as the only force acting on the moving object. The acceleration of a free falling object is always constant. On the surface of the earth, the acceleration of is equal to 10ms-2, and is named as gravitational acceleration. In SPM, you need to know the graphs of … Read more

Velocity – Time Graph The gradient of the velocity-time gradient gives a value of the changing rate in velocity, which is the acceleration of the object. The area below the velocity-time graph gives a value of the object’s displacement. Analysing Velocity-Time Graph When analysing the velocity-time graph, always keep in mind that the gradient of … Read more

Displacement – Time GraphIn a Displacement-Time Graph, the gradient of the graph is equal to the velocity of motion. Analysing Displacement – Time Graph When analysing the displacement-time graph, always remember that the gradient of the graph represents the velocity of the graph. Therefore, if the gradient of the graph is positive, the velocity is … Read more

There are 3 types of motion graph, namely the displacement-time graph the velocity-time graph the acceleration-time graph. When analysing a graph, it’s important for us to know what’s the physical quantity that’s represented by the gradient of the graph and the area below the graph.  For example, in a displacement-time graph, the gradient represent the … Read more

Finding Acceleration Acceleration of motion can be determined by using ticker tape through the following equation:Caution!:t is the time taken from the initial velocity to the final velocity. Example:The ticker-tape in the figure above was produced by a toy car moving down a tilted runway. If the ticker-tape timer produced 50 dots per second, find … Read more

Finding VelocityThe velocity of motion can be determined by using ticker tape through the following equation:Caution!:t is the time taken from the first dot to the last dot of the distance measured. Example:The diagram above shows a strip of ticker tape that was pulled through a ticker tape timer that vibrated at 50 times a … Read more

A ticker-tape timer consists of an electrical vibrator which vibrates 50 times per second. This enables it to make 50 dots per second on a ticker-tape being pulled through it. The time interval between two adjacent dots on the ticker-tape is called one tick. One tick is equal to 1/50 s or 0.02 s. Example:Find … Read more

Challenging Question 1:A car starts from rest and accelerates at a constant acceleration of 3 ms-2 for 10 seconds. The car then travels at a constant velocity for 5 seconds. The brakes are then applied and the car stops in 5 seconds. What is the total distance travelled by car?   Answer:It’s advisable to list down … Read more