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100
What is the value of acceleration of free fall?
9.8m/s2
100
Why velocity is considered as vector quantity but speed is scalar quantity?
Velocity - Consist of both magnitude and direction
Speed - Only magnitude
100
Ft = mv - mu. Is this equation correct?
Yes
100
What are the two conditions for the object to be in EQUILIBRIUM?
No resultant force (Forces are balanced)
No resultant moment (Moments are balanced)
100
Formula and Unit of Speed and Acceleration
speed = d/t, m/s
acceleration = (change in v)/t, m/s2
200
Convert 2.7 g/cm3 to kg/m3
2700 kg/m3
200
Formula and Unit for moment of a force.
Moment = Force x perpendicular distance from the pivot
Unit = Nm
200
How to find the distance travelled given a speed time graph?
Area under the graph
200
What is a centre of gravity?
A point where the mass of the object is concentrated
300
The greater the gradient of a distance - time graph, the greater is the speed. True or False?
True
300
Describe how to measure volume using displacement method
Measure initial volume of the water in measuring cylinder
Drop the object in the measuring cylinder
Read the final volume reading
Volume = Final - initial
300
Increasing force or distance from the pivot decreases the moment of a force. True or False?
False
300
Is impulse the same with force? Yes or No?
Give the unit of impulse
No
Unit = Ns
300
Give the equation of force in terms of momentum and time
force = (change in momentum)/time
400
If the gradients of a distance time graph is constant, what does it says about the speed and acceleration?
Speed = constant
Acceleration = 0
400
A car is travelling from 0 m/s until it reaches 20 m/s in 10s. Find the distance the car has travelled.
100 m
400
When the object moves in a circle, what happen to the speed and velocity?
Speed = constant
Velocity = changes
400
What is the relationship between mass, weight and gravity
w = mg
400
What is the formula of a density?
density = mass/volume
500
What is terminal velocity?
The maximum speed reached by an object when moving through a fluid
500
What is the resultant force when there is 4.0 N force acting to the East and 3.0 N to the south?
5.0 N
500
State the principle of the conservation of momentum
When two or more bodies are in collision, the total momentum is constant and does not change unless there is an external force acting on it.
500
Find the diameter of one of the ball
2 cm
20 mm