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Questions and Answers

A 2 kg object is moving at a velocity of 4 m/s. What is the momentum of the object?

The momentum of the object is 8 kg m/s.

A projectile is launched at an angle of 30° to the horizontal. What is the direction of the acceleration of the projectile at the highest point of its trajectory?

The acceleration is vertically downward, with a magnitude of 9.8 m/s².

A force of 10 N is applied to an object for 2 seconds. What is the impulse of the force?

The impulse of the force is 20 Ns.

A 5 kg object is lifted 2 m vertically upward. What is the change in potential energy of the object?

The change in potential energy is 98 J. Signup and view all the answers

A 10 kg object is moving at a velocity of 3 m/s. What is the kinetic energy of the object?

The kinetic energy of the object is 45 J. Signup and view all the answers

What is the main difference between vertical and horizontal motion, and provide an example of a real-world scenario where both types of motion occur simultaneously.

Vertical motion is motion that occurs in the vertical direction (up or down), whereas horizontal motion occurs in the horizontal direction (left or right). An example of both types of motion occurring simultaneously is when a thrown ball moves upward and forward, exhibiting both vertical and horizontal motion. Signup and view all the answers

Explain how the concept of conservation of momentum applies to a closed system, and provide an example of a real-world situation where this concept is observed.

The concept of conservation of momentum states that the total momentum of a closed system remains constant over time. An example of this concept is when a car crashed into a wall, the momentum of the car is transferred to the wall, and the wall's momentum increases, resulting in damage. Signup and view all the answers

What is the relationship between work and energy, and provide an example of a situation where work is done on an object, resulting in a change in its energy?

Work is the transfer of energy from one object to another, resulting in a change in the object's energy. An example is when a force is applied to push a box up an inclined plane, work is done on the box, resulting in an increase in its potential energy. Signup and view all the answers

Explain the concept of electrical energy, and provide an example of a device that converts electrical energy into another form of energy.

Electrical energy is the energy associated with the movement of charged particles, such as electrons. An example is a light bulb, which converts electrical energy into light and heat energy. Signup and view all the answers

How does the concept of kinetic energy relate to an object's velocity, and provide an example of a situation where an object's kinetic energy is converted into potential energy?

Kinetic energy is the energy of motion, and it is proportional to an object's velocity squared. An example is when a roller coaster reaches the top of a hill, its kinetic energy is converted into potential energy, as it gains potential energy due to its increased height. Signup and view all the answers