quarter 2 - q2

Question 1

When there is a change in motion, there is ____.

Answer 1

work

Question 2

work is a scalar quantity

true or false

Answer 2

true

Question 3

Result of a force acting upon an object to cause a displacement of the object; when you move in place, then there is no ______ done.

Answer 3

work

Question 4

work formula

Answer 4

w=fd

Question 4

In order for a force to qualify as having _____ done on an object, there must be a displacement and the force must be the cause of that displacement.

Answer 4

work

Question 5

• Only the force that acts on the direction of motion counts towards work

true or false

Answer 5

true

Question 6

• this formula only applies if F and d are parallel (same direction)

Answer 6

w = fd

Question 7

formula If force and
displacement do
not point in the
same direction

Answer 7

W=Fd (cos)

Question 8

TYPES OF WORK (3)

Answer 8

WORK AGAINST INERTIA
WORK AGAINST FRICTION
WORK AGAINST GRAVITY

Question 9

Applying force to cause change in motion
E.g. throwing/kicking a ball

Answer 9

Work against inertia

Question 10

Involves height
W = mgh
m = mass
g = acceleration due to gravity

Answer 10

Work against gravity

Question 11

Work in going up and going down will always be equal no matter how slow or how quick the person moved

TRUE OR FALSE

Answer 11

TRUE

Question 12

Ability to do work.
Expressed in Joules

Answer 12

ENERGY

Question 13

No energy means no work is done.

TRUE OR FALSE

Answer 13

TRUE

Question 14

: property of a body or system of bodies by which work can be done or performed.

Answer 14

Energy

Question 15

The _____ possessed by a body is equal to the total work it can do

Answer 15

energy

Question 16

ENERGY IS A SCALAR QUANTITY

T OR F

Answer 16

TRUE

Question 17

The energy of objects at rest; stored energy

Answer 17

Potential energy

Question 18

Energy stored in elastic materials such as rubber bands, bungee cords, springs, arrows drawn into a bow

Answer 18

Elastic potential energy

Question 19

The result of stretching or compressing

The more the object is stretched/compressed, the more stored energy is evident in the object.

Answer 19

Elastic potential energy

Question 20

stored as the result of the gravitational attraction of the Earth for the object

Answer 20

Gravitational potential energy

Question 21

is directly proportional to both mass and height.

Answer 21

GPE

Question 22

The energy of objects in motion

Once the object at rest starts moving, the PE it has will then be converted to _____

Answer 22

Kinetic Energy

Question 23

Rate at which work is done
Rate at which energy is expended from PE to KE and KE back to PE

Answer 23

POWER

Question 24

is the amount of work done divided by the time it takes to do it

Answer 24

Power

Question 25

is the energy expended/transformed divided by the time it takes to expend it.

Answer 25

Power

Question 26

T OR F Work has nothing to do with the amount of time the force acts to cause the displacement

Answer 26

TRUE

Question 27

No matter how fast or slow you do a task, it does not affect POWER but it effects WORK TRUE OR FALSE

Answer 27

FALSE No matter how fast or slow you do a task, it does not affect work but it effects power

Question 28

Time is inversely proportional to power. Therefore, the shorter the time the work is done, the higher the power exerted. The longer the time, the lesser the power exerted. TRUE

Answer 28

TRUE