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Work Energy and Potential Review
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1
Question
What is the definition of work in physics?
Answer
Work is the product of force and displacement in the force direction (W = F · s)
2
Question
What is the formula for work done by a constant force at angle θ to displacement?
Answer
W = F s cos θ
3
Question
In the work equation W = F · s, what does θ represent?
Answer
Angle between force and displacement directions
4
Question
What is the work done when displacement is zero?
Answer
Zero work (W = 0)
5
Question
What is the work done by a torque τ when rotated through angular displacement θ?
Answer
W = τ θ
6
Question
What is the work done by a couple in rotating an object by an angular displacement θ?
Answer
W = τ θ (torque times angular displacement)
7
Question
What is the relationship between energy and work in the context of angular displacement?
Answer
Work is the product of torque and angular displacement, W = τ θ
8
Question
If a vehicle is pulled 200 m with a force of 8 kN along the same direction, what is the work done?
Answer
W = 1,600,000 N·m (or 1,600 kN·m)
9
Question
What is the formula to calculate work done against gravity for lifting a mass m by height h?
Answer
W = m g h
10
Question
Which energy form stores energy in atoms and molecules?
Answer
Chemical energy
11
Question
Which energy form is stored in the nucleus of an atom?
Answer
Nuclear energy
12
Question
Which energy form is stored in a stretched spring or compressed spring?
Answer
Mechanical energy
13
Question
Which energy form is stored due to an object's height?
Answer
Gravitational energy
14
Question
Which energy form is stored in moving objects?
Answer
Motion energy (kinetic energy)
15
Question
Which energy form involves movement of charged particles?
Answer
Electrical energy
16
Question
Which energy form involves heat energy resulting from molecular movement?
Answer
Thermal energy
17
Question
What energy form is associated with vibrations that produce sound?
Answer
Sound energy
18
Question
What energy form comprises electromagnetic waves like light?
Answer
Radiant energy
19
Question
What is the equivalence given for energy in terms of force and displacement?
Answer
Energy is the capacity to do work (scalar)
20
Question
What is energy stored due to an object's position called?
Answer
Potential energy
21
Question
Which energy form is associated with motion of objects?
Answer
Kinetic energy
22
Question
What energy form results from the movement of charged particles?
Answer
Electrical energy
23
Question
What type of energy describes the energy of motion?
Answer
Kinetic energy
24
Question
What is thermal energy a result of?
Answer
Movement of atoms and molecules
25
Question
What energy form is produced by electromagnetic waves?
Answer
Radiant energy
26
Question
In a roller coaster example, what energy is gained as it goes downhill?
Answer
Kinetic energy
27
Question
What does the equation Ug = mgh compute?
Answer
Gravitational potential energy increase
28
Question
If a 5 kg backpack is lifted 1.0 m, what is Ug using g ≈ 9.81 m/s²?
Answer
U g = 49 J (approximately)
29
Question
What is potential energy?
Answer
Energy due to position; work done to lift a mass to height.
30
Question
What is the unit of potential energy?
Answer
Joules (J) or Newton-meters (N·m)