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A ball is thrown vertically upwards. At the highest point of its trajectory, its acceleration is:
Zero
9.8 m/s² upwards
9.8 m/s² downwards
Dependent on the initial velocity
An object is thrown vertically upwards with an initial velocity 'u'. Neglecting air resistance, what is its velocity at the highest point?
u m/s
0 m/s
-u m/s
9.8 m/s
The force acting on a particle is given by , where is a positive constant. Which of the following is true about the work done by this force as the particle moves from to ?
Positive
Negative
Zero
Depends on the value of k
If the work done by a force is zero, which of the following must be true?
The force is zero.
The displacement is zero.
Either the force or the displacement is zero, or the force and displacement are perpendicular.
The force and displacement are in the same direction.
Two identical balls are placed at heights h and 2h respectively. The ratio of their potential energies is:
1:1
1:2
1:4
2:1
If the mass of an object is doubled while keeping its height constant, its gravitational potential energy will:
Halve
Double
Quadruple
Remain the same
A ball is dropped from a height 'h'. Just before it hits the ground, its potential energy is converted into:
Kinetic energy
Heat energy
Sound energy
Chemical energy
Which of the following is the correct expression for the work done by a variable force in one dimension?
In vertical circular motion, the quantity that remains constant is:
Kinetic Energy
Potential Energy
Tension in the string
Total Mechanical Energy
A stone tied to a string is whirled in a vertical circle. At which point is the string most likely to break?
Highest point
Lowest point
Midway between highest and lowest point
Equally likely at all points
