P11 Force, Work

A force of 10 N is applied on a body at an angle of 30° to the horizontal, and displaces the object by 8 m horizontally. The work done up to two significant figures is ____ joules.

A variable force, given by \(F= 2x\), acts on an object, where \(x\) is the displacement in meters. If the object is displaced from \(x=1 m\) to \(x= 4 m\), the work done is ___ joules.

Work done on an object is equal to the

If a force F acts on a body at an angle of \(\theta\) and displaces it by displacement d. There will be no work done if

Tick \(\text{all}\) the correct answers.

In a system with \(\text{only}\) conservative forces, the total mechanical energy (kinetic energy + potential energy) is

The relationship between potential energy \(U\) and work \(W\) is

The gravitational potential energy of an object is dependent on

(Tick all the correct answers.)

The correct definition of \(\text{potential}\) energy is

An object of mass 0.5 kg is released from a height of 4 m above the ground. Its velocity just before hitting the ground is ______ m/s. (Take \(g = 9.8 m \cdot s^{-2}) \) Answer should be in two significant figures.

An object of mass 2 kg is lifted to a height of 5 m above the ground. The gravitational potential energy at this height is _______ joules. (Take \(g = 9.8 m \cdot s^{-2}) \)

A force compresses a spring of spring constant 20 N/m by 0.1 m. Determine the potential energy stored in the spring is (____ \(\times 10^{-3}\) joules)

In a conservative force field, the total \(\text{mechanical}\) energy of an object is conserved when:

If an object moves in a gravitational field and returns to its initial height, the net work done by gravity is:

Which of the following is an example of a conservative force?

A force is considered conservative if:

If Potential Energy is taken to be zero at relaxed configuration of a body spring system, its potential energy when the body is stretched to a distance x from its relaxed position is

If a block in the block-spring system moves from a position \(x_i\) to \(x_f\), then change in potential energy \(\Delta U\) =

Gravitational Potential Energy of a body having mass m is

Which is incorrect about \(\text{conservative}\) force?

Which is incorrect about \(\text{potential}\) energy?

A car with a mass of \(1000\) kg is traveling at a speed of \(20\) m/s. What is its kinetic energy in kilojoule?