Factors Affecting Kinetic Energy

Q.

When kinetic energy of a body increased by 200%. The percentage change in momentum of the body is ___%.

___

Q.

On what factors does the kinetic energy of a body depend?

Q.

Define kinetic energy. Give the mathematical expression for it.

Q.

The kinetic energy acquired by a body of mass `m’ after travelling a fixed distance from rest under the action of a constant force is:

1. Directly proportional to mass m,
2. Inversely proportional to square root of mass
3. Independent of mass m
4. Inversely proportional to mass m

Q.

A car and a bike are running with same speed. Which of the two will have more K.E. and why?

Q.

A truck and a car have same momentum. The kinetic energy of the car is:

1. more than truck

2. less than truck

3. equal to truck

4. none of the above

Q. The momentum of an object is equal to the product of its mass and velocity.

1. True
2. False

Q. Why does the mass change when any object is accelerated at or near to the speed of light?? Does this mass increase or decrease??

Q.

Derive the relation between kinetic energy and momentum. [3 MARKS]

Q. If the kinetic energy of particle becomes 16 times, then the magnitude of linear momentum will be

1. 4 times
2. 8 times
3. 2 times
4. 16 times

Q. What is kinetic energy?

Q.

A body has kinetic energy even if its momentum is zero.

1. True

2. False

Q.

Which is having more effect on the kinetic energy. Either increase of velocity or increase of mass of the object? [2 MARKS]

Q.

Kinetic energy of an object is proportional to the square root of its velocity.

1. True

2. False

Q.

Write the equation for kinetic energy.

Q.

All the particles moving with the same velocity have the same kinetic energy.

1. True
2. False

Q.

A bullet is fired from a gun. Which will have greater kinetic energy: The bullet or the gun?

Q. A heavy and a light body have equal momentum. Which of the following has greater kinetic energy?

1. Can't determine
2. Both have same kinetic energy
3. Light body
4. Heavy body

Q. A truck has a mass of 8000 kgs, a car has a mass of 1000 kgs and a bike has a mass of 100 kgs. Both the truck and car are moving on a level road at $45m{s}^{-1}$. The bike, however, is going on the same level road at $55m{s}^{-1}$. The kinetic energy will be more for the _______.

1. truck
2. car
3. bike
4. truck and bike only

Q. What happens to the mass of a body if it travels faste than the speed of light

Q.

When kinetic energy of a body increased by 200%. The percentage change in momentum of the body is ___%.

___

Q. When an object is travelling almost at the speed of light, the mass of the object ______.

Q.

A truck has a mass of $8000kg$, a car has a mass of $1000kg$ and a bike has a mass of $100kg$. All of them are moving with the same velocity on a road. Then, the kinetic energy will be highest for the:

1. Bike

2. Car

3. Truck

4. All three have same kinetic energy

Q. A light and a heavy body have equal momentum, the kinetic energy is greater for

1. Heavy Body
2. Light body
3. Both heavy and light body
4. Neither heavy body nor light body

Q. A heavy and a light body have equal momentum. Which of the following has greater kinetic energy?

1. Light body
2. Can't determine
3. Heavy body
4. Both have same kinetic energy

Q. What is kinetic energy?

Q.

Define kinetic energy. Derive an expression for it.

Q. An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

Q. List the factors on which kineti

1. Kinetic energy = $\frac{1}{2}m{v}^2$

2. Kinetic energy basically depends on mass and velocity of the object.

Q.

A body having 5 kg mass is travelling with a certain velocity and has 10 kg m/s momentum. What will be its kinetic energy?

1. 50 J

2. 100 J

3. 10 J

4. 2 J