Which statement best describes how the mass and speed of an object affect its kinetic energy?
An object with greater mass and higher speed will have more kinetic energy.
Kinetic energy is given by KE = \(\frac{1}{2}mv^2\), where m is the mass and v is the speed.
KE increases directly with mass, so more mass means more kinetic energy at the same speed.
KE increases with the square of speed, so a higher speed raises it even more sharply.
Therefore an object having both greater mass and higher speed carries the most kinetic energy.
Hence, the answer is An object with greater mass and higher speed will have more kinetic energy.
When a moving car suddenly applies brakes, its kinetic energy is transformed mainly into which form of energy?
Two students move identical boxes through a distance of 10 m. Student A applies a force of 50 N, while Student B applies a force of 100 N. What is the difference in the work done by the two students?
Which of the following best defines 'work' in physics?
A car of mass 1200 kg accelerates from rest to a speed of 20 m/s on a straight road. If the kinetic energy gained by the car is completely due to the work done by the engine, which of the following best represents the total kinetic energy acquired by the car at this speed?
Which of the following scenarios best demonstrates the conversion of chemical energy to mechanical energy?
A roller coaster at the top of its track has maximum potential energy. As it descends and speeds up, what principle explains why the sum of its kinetic and potential energies remains constant if we ignore friction and air resistance?
A force of 10 newtons moves an object 2 metres. How much work is done?
If two vehicles have the same motor but one carries more passengers, which will need higher tractive effort on the same road?
A technician lifts a box using a hoist. What type of energy is primarily involved in lifting?
If a force acts on a body but no displacement occurs, the work done is:
A boy raises a box with a weight of 120 N from a height of 2 m. The work done by him is ________.
While releasing the arrow from a stretched bow, the Potential Energy of the bow is converted into?
Which is the main source of almost all energy on Earth?
Area under constant velocity – time curve equals ________ of the object over a given time interval.
If a body of mass is m, linear momentum is p and kinetic energy is K, then which of the following expressions is true?