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Work Lowersixth Science Physics
 

Work Lowersixth Science PhysicsOnline version

Quick true/false on moments and work concepts.

by YAKILI LMS
1

Work and energy are unrelated concepts in physics.

2

The area under a Force–displacement graph for a constant force is a rectangle.

3

Work is always positive for any force acting on a moving object.

4

Work done by a force cannot be negative in any situation.

5

Conservative forces never change potential energy.

6

1 joule = 1 newton × 1 metre.

7

Work done by a moving object is the rate at which velocity changes.

8

In uniform circular motion, the work done by the centripetal force over a full revolution is zero.

9

When lifting a mass upward against gravity, positive work is done by the lifting force.

10

In a vacuum, no work can be done by gravity.

11

If a force is antiparallel to displacement, the work done is always positive.

12

The moment of a force about a pivot depends only on the magnitude of the force, not its line of action.

13

The SI unit for moment is the joule.

14

The work done by gravity is always negative when an object falls.

15

An oblique force has a component along the displacement that can do work.

16

Centripetal force does positive work in uniform circular motion.

17

1 joule equals 1 newton × 1000 metres.

18

The SI unit for work is also the newton–metre.

19

The moment of a force about a pivot equals the force multiplied by the perpendicular distance to the pivot.

20

If the displacement is zero, the work done is maximum.

21

The unit of work is the newton.

22

The work–energy theorem states that work done on an object equals the change in its kinetic energy.

23

The Joule is named after James Prescott Joule.

24

Conservative forces store energy as potential energy; non-conservative forces dissipate energy as heat.

25

The area under a velocity–displacement graph represents work.

26

The work–energy theorem states that force equals mass times acceleration.

27

The area under a Force–displacement graph for a variable force is always a straight line.

28

The unit of work is the joule.

29

Work done against gravity increases gravitational potential energy.

30

Work done by a variable force is the integral of force with respect to displacement.

31

Work can be positive, negative, or zero depending on the relative directions of force and displacement.

32

A non-conservative force cannot change the total mechanical energy of a system.

33

Work done by a force always changes the kinetic energy by the same amount regardless of other energies in the system.

34

The area under a Force–displacement graph is always a triangle.

35

The moment of a force is measured in newton-metres but has no relation to distance.

36

Work done by a friction force is always zero.

37

The Joule is a unit of power.

38

All forces that act on an object do positive work.

39

Power is the total amount of work done in a system, regardless of time.

40

Work is the same as force.

41

A variable force requires no calculus to compute work.

42

Work done by a constant force is the area under the force–displacement graph.

43

Work done by a force is independent of the direction of displacement.

44

If a force is perpendicular to the displacement, the work done is zero.

45

The area under a Force–displacement graph represents the work done by the force.

46

The area under a Force–displacement graph is always negative.

47

Work done by gravity is always positive.

48

For a force acting at an angle theta to the displacement, the work is W = F d cos theta.

49

Work is defined as the product of force and the perpendicular distance moved, W = F d cos theta, in joules.

50

The Joule is the SI unit for work, equal to one newton metre.

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