Motion
What is motion?
The changing of object's or person's position relative to a frame of reference
Does a car that goes 200 km/hour has a vector value? Why?
No, because it doesn't have any direction for the motion
How to differentiate between instantaneous and average velocity in a scenario where a car is speeding up before slowing down?
Instantaneous velocity is when the velocity is calculated in one moment of the trip, the average one is the middle number of the whole trip
A magician pulls a tablecloth beneath a pile of plates. The pile doesn't come crashing down. Which Newton's Laws of Motion point application is this?
The first one (inertia)
How do we know that we're moving in physics?
By using a frame of reference to see a change in position
How to differentiate distance and displacement?
Distance is the total length of change, displacement is the comparison between the original point and the final one
Do we use distance or displacement in calculating velocity?
Displacement
What is the example of Newton's third law of motion in our daily lives?
Rockets, pushing-pulling, etc (teacher decides)
How to differentiate between relative and true motion?
True motion has one frame of reference not changing
Can distance have a negative value?
No, total length will always be positive
Explain inertia with your own words
(The teacher decides)
The heavier something is, the bigger the force needed to move or accelerate it. Which Newton's Law is this?
The second one.
A person standing was seen as moving by an astronaut in the Earth's orbit, why?
Because the Earth is spinning, thus the person is moving also
Why is it called a "speedometer", not "velocitymeter"?
Since it only measure the value of speed, not the direction
Name one physical phenomenon example from our daily lives that proves "every action has an equal and opposite reaction"?
Water rocket, water burst down and the rocket shoots up
A 12,000 kg rocket leaves Earth for Mars with a force of 152,000 N. The gravitational pull of Earth is 10 m/s2. How much is the reaction force?
The opposite of action force, 152,000 N but to the other direction
Two trains are passing by each other in different direction, what are the examples of frames of reference in this scenario?
Person sitting in one train looking at the other, person outside looking at the two trains passing
Pak Zul covers 210 km by car at a speed of 70 km/hr. find the time taken to cover this distance.
70 km is covered in 1 hour.
1 km is covered in 1/70 hours.
210 km is covered in 1/70 × 210 hours = 3 hours
Given: speed = 70 km/hr, distance covered = 210 km
Time taken = Distance/ Speed = 210/70 hours = 3 hours
(Newton's Second Law of Motion)
A baseball is thrown at 150m/s2 and its mass is 0.5kg. What is the force?
F=m×a
F=0.5kg×150m/s2
F=75kgm/s2
Or
F=75N (Newtons)
Calculate the net force required to give an automobile of mass 2 metric tons an acceleration of 4.8 m/s2.
9,600 Newton