Question 1

Friction is the gravity that opposes motion.

Accepted Answer

false

Answer

true

Question 2

The farther the object is from Earth, the lesser is the gravitational force acting on it.

Accepted Answer

true

Answer

false

Question 3

Which of these is the reason why the moon rotates around Earth?

Accepted Answer

gravity

Answer

mass

Answer

friction

Answer

heat

Question 4

What is produced when you rub a matchstick against the side of a matchbox?

Accepted Answer

heat and light

Answer

chemical and light

Answer

light and sound

Answer

sound and heat

Question 5

Which refers to the amount of matter in an object?

Accepted Answer

mass

Answer

gravity

Answer

force

Answer

friction

Question 6

What will happen to your weight when you go to the moon?

Accepted Answer

it will decrease

Answer

it will remain the same

Answer

it will be gone

Answer

it will increase

Question 7

Which refers to the force that attracts objects to each other?

Accepted Answer

gravity

Answer

pull

Answer

texture

Answer

friction

Question 8

Which of these is an example of an undesirable effect of friction?

Accepted Answer

energy loss in machines

Answer

copying notes on the board

Answer

keeping our balance

Answer

walking down the street

Question 9

Which of these is an example of a desirable effect of friction?

Accepted Answer

rubbing your hands during the cold season

Answer

overheating of machines

Answer

wear-and-tear of shoes

Answer

vehicles consume more fuels

Question 10

Clock

Accepted Answer

mechanical energy

Answer

sound energy

Answer

heat energy

Answer

light energy

Question 11

Flat irons

Accepted Answer

heat energy

Answer

sound energy

Answer

mechanical energy

Answer

light energy

Question 12

Ceiling fan

Accepted Answer

mechanical energy

Answer

heat energy

Answer

light energy

Answer

sound energy

Question 13

Radio

Accepted Answer

sound energy

Answer

mechanical energy

Answer

light energy

Answer

heat energy

Question 14

This are mechanical devices are used to make work easier, faster, and more accurate.

Accepted Answer

simple machines

Answer

chemical machines

Answer

light machines

Answer

energy machines

Question 15

Work may be defined as a force acting through a distance. Force is a push or pull.

Accepted Answer

true

Answer

false

Question 16

A lever is a rigid bar that moves about a point called folklore.

Accepted Answer

false

Answer

true

Question 17

Machines can change the direction of the force.

Accepted Answer

true

Answer

false

Question 18

Fulcrum may be placed at different points.

Accepted Answer

true

Answer

false

Question 19

Baseball bat

Accepted Answer

third-class lever

Answer

second-class lever

Answer

first-class lever

Question 20

Claw hammer

Accepted Answer

first-class lever

Answer

second-class lever

Answer

third-class lever

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