10 Questions
Which of the following statements is true about work?
Work has only magnitude but no direction
Which physical quantity has magnitude but no direction?
Work
Among a raised hammer, a bullet fired by a gun, a moving stone, and a rotating wheel, which can do the most work?
A bullet fired by the gun
If a force of 20 N displaces an object through 2 m and does 20 J of work, what is the angle between the force and displacement?
60°
Why is work considered a scalar quantity?
Work is the dot product of two vectors
If an object of mass 12kg is raised through a height of 1.5m, the work done on the object is equal to:
180 J
In the scenario where an aeroplane travels 4000m and the work done is 20000J, what is the force applied on it?
5 N
The gravitational potential energy of an object above the ground is defined as the work done in lifting it from the ground to:
The point opposite gravity
If a car weighing 800kg increases its speed from 5 m/s to 10 m/s, the work done is approximately:
30 kJ
When an object of 1kg is dropped to the ground from a height of 30m, what is the work done by the force of gravity?
$300 J$
Test your understanding of work in physics as a scalar quantity. Explore why work is considered scalar by being the dot product of two vectors - force and displacement, leading to its magnitude without direction.
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