Question 1

What is friction?

Accepted Answer

the force that opposes motion between two surfaces in contact

Answer

the force that increases as the speed of motion decreases

Answer

the force that disappears when two surfaces are in contact

Answer

the force that causes motion between two surfaces in contact

Question 2

Which factors affect the amount of friction between surfaces?

Accepted Answer

both the types of surfaces and the force pressing them together

Answer

only the types of surfaces in contact

Answer

only the force pressing the surfaces together

Answer

neither the types of surfaces nor the force pressing them together

Question 3

Which type of friction is caused by the microscopic roughness of surfaces?

Accepted Answer

static friction

Answer

lubricated friction

Answer

kinetic friction

Answer

rolling friction

Question 4

Which type of friction occurs when a surface moves across another surface?

Accepted Answer

kinetic friction

Answer

lubricated friction

Answer

rolling friction

Answer

static friction

Question 5

Which type of friction is reduced by adding a lubricant?

Accepted Answer

rolling friction

Answer

static friction

Answer

kinetic friction

Answer

internal friction

Question 6

What is the difference between kinetic and static friction?

Accepted Answer

kinetic friction occurs when surfaces move relative to each other, while static friction occurs when they are not moving

Answer

static friction is constant, but kinetic friction decreases with speed

Answer

kinetic friction is greater than static friction, regardless of the surfaces' roughness

Answer

static friction occurs when surfaces move relative to each other, while kinetic friction occurs when they are not moving

Question 7

What is the direction of the frictional force?

Accepted Answer

opposite to the direction of motion

Answer

in the same direction as the direction of motion

Answer

perpendicular to the surface of contact

Answer

can be in any direction depending on the orientation of the surfaces

Question 8

What are some ways to reduce friction?

Accepted Answer

using lubricants, polishing surfaces, and using ball bearings

Answer

increasing the roughness of surfaces

Answer

applying more force to overcome the frictional force

Answer

decreasing the force pressing surfaces together

Question 9

What is gravity?

Accepted Answer

A force that attracts objects to each other

Answer

A force that keeps objects stationary

Answer

A force that repels objects from each other

Answer

A force that only affects living things

Question 10

What is the force exerted by the Earth's gravity?

Accepted Answer

9.8 m/s^2

Answer

5 m/s^2

Answer

15 m/s^2

Answer

20 m/s^2

Question 11

What is the difference between weight and mass?

Accepted Answer

Weight is the measure of the force of gravity on an object, while mass is the amount of matter in an object

Answer

Weight is the amount of matter in an object, while mass is the measure of the force of gravity on an object

Answer

Weight and mass are the same thing

Answer

Weight is the gravitational pull of an object

Question 12

What is the importance of gravity in our solar system?

Accepted Answer

It keeps planets in their orbits

Answer

It creates stars

Answer

It causes planets to collide with each other

Answer

It creates comets

Question 13

What is the relationship between distance and gravitational force?

Accepted Answer

The farther apart two objects are, the weaker the gravitational force between them

Answer

Distance does not affect gravitational force

Answer

The closer two objects are, the weaker the gravitational force between them

Answer

The farther apart two objects are, the stronger the gravitational force between them

Question 14

What is the force that opposes the force of gravity?

Accepted Answer

Air resistance

Answer

Centripetal force

Answer

Magnetic force

Answer

Friction

Question 15

What is the effect of gravity on the shape of planets?

Accepted Answer

It causes them to be spherical

Answer

It causes them to be square

Answer

It has no effect

Answer

It causes them to be flat

Question 16

What is the effect of gravity on the density of objects?

Accepted Answer

It increases the density

Answer

It makes the object disappear

Answer

It has no effect

Answer

It decreases the density

Question 17

What is the effect of gravity on time?

Accepted Answer

It slows down time

Answer

It speeds up time

Answer

It stops time

Answer

It has no effect

Question 18

What is the effect of gravity on the human body during space travel?

Accepted Answer

It causes muscle loss and bone density loss

Answer

It causes muscle gain and bone density gain

Answer

It has no effect

Answer

It causes the body to shrink

Question 19

What is the effect of gravity on the tides?

Accepted Answer

It causes the tides to change

Answer

It has no effect on tides

Answer

It makes the tides disappear

Answer

It causes the tides to reverse

Question 20

What practical benefit does gravity provide for humans?

Accepted Answer

Keeping our feet on the ground

Answer

Causing us to fly

Answer

Allowing us to float in space

Answer

Allowing us to jump higher

Question 21

Which of the following is not an application of gravity?

Accepted Answer

Creating anti-gravity devices

Answer

Generating tidal forces on Earth

Answer

Keeping planets in orbit around the sun

Answer

Causing objects to fall to the ground

Question 22

What is the name of the force that opposes gravity and allows airplanes to fly?

Accepted Answer

Lift

Answer

Momentum

Answer

Thrust

Answer

Drag

Question 23

Which of the following is not a practical application of gravity in our daily lives?

Accepted Answer

Causing hair to stand on end

Answer

Providing resistance while exercising

Answer

Allowing us to walk upright

Answer

Keeping objects on shelves

Question 24

What practical benefit does gravity provide for plants?

Accepted Answer

Allowing roots to grow downwards

Answer

Attracting pollinators

Answer

Allowing them to grow taller

Answer

Increasing photosynthesis

Question 25

What is the name of the force that opposes gravity and allows ships to float?

Accepted Answer

Buoyancy

Answer

Tension

Answer

Shear

Answer

Compression

Question 26

What practical benefit does gravity provide for the Earth's atmosphere?

Accepted Answer

Holding it in place

Answer

Creating wind patterns

Answer

Filtering harmful radiation

Answer

Generating lightning

Question 27

Which of the following is NOT a form of energy?

Accepted Answer

Water

Answer

Kinetic

Answer

Water

Answer

Solar

Answer

Wind

Question 28

What is the energy stored in an object due to its position or shape called?

Accepted Answer

Potential

Answer

Kinetic

Answer

Thermal

Answer

Electrical

Answer

Potential

Question 29

What is the energy of motion called?

Accepted Answer

Kinetic

Answer

Electrical

Answer

Potential

Answer

Thermal

Question 30

What is the energy associated with the movement of charged particles called?

Accepted Answer

Electrical

Answer

Potential

Answer

Thermal

Answer

Kinetic

Question 31

What is the energy associated with the random motion of particles?

Accepted Answer

Thermal

Answer

Electrical

Answer

Potential

Answer

Kinetic

Question 32

What is the energy from sunlight called?

Accepted Answer

Solar

Answer

Kinetic

Answer

Wind

Answer

Water

Question 33

What is the energy from moving air called?

Accepted Answer

Wind

Answer

Kinetic

Answer

Water

Answer

Solar

Question 34

What is the energy from the movement of water called?

Accepted Answer

Hydro

Answer

Kinetic

Answer

Wind

Answer

Solar

Question 35

What is the energy from the movement of atoms and molecules called?

Accepted Answer

Thermal

Answer

Potential

Answer

Electrical

Answer

Kinetic

Question 36

What is the energy stored in the bonds of molecules?

Accepted Answer

Chemical

Answer

Electrical

Answer

Kinetic

Answer

Thermal

Question 37

What is energy?

Accepted Answer

The ability to do work

Answer

The substance that makes things move

Answer

The force that holds atoms together

Answer

The process of breaking down food

Question 38

What is an example of potential energy?

Accepted Answer

A stretched out rubber band

Answer

A running person

Answer

A rolling car

Answer

A bouncing ball

Question 39

What is an example of kinetic energy?

Accepted Answer

A moving bicycle

Answer

A stationary rock

Answer

A sleeping cat

Answer

A still tree

Question 40

What is a transformation of energy?

Accepted Answer

The conversion of one form of energy to another

Answer

The creation of energy from scratch

Answer

The movement of energy from one place to another

Answer

The destruction of energy

Question 41

What is an example of a transformation of energy?

Accepted Answer

Turning on a light switch

Answer

Watching TV

Answer

Sitting in a chair

Answer

Eating lunch

Question 42

What is a renewable energy source?

Accepted Answer

Solar energy

Answer

Coal

Answer

Natural gas

Answer

Gasoline

Question 43

What is a non-renewable energy source?

Accepted Answer

Oil

Answer

Wind

Answer

Geothermal energy

Answer

Water

Question 44

What is an example of energy being wasted?

Accepted Answer

Leaving lights on when no one is in the room

Answer

Taking public transportation instead of driving a car

Answer

Turning off lights when leaving the room

Answer

Recycling paper and plastic

Question 45

What is an example of energy being conserved?

Accepted Answer

Turning off the water while brushing your teeth

Answer

Using a lot of paper towels

Answer

Driving a car instead of walking or biking

Answer

Leaving the water on while brushing your teeth

Question 46

Which simple machine can be used to lift heavy objects?

Accepted Answer

Pulley

Answer

Wheel and Axle

Answer

Inclined Plane

Answer

Lever

Question 47

What type of simple machine is a seesaw?

Accepted Answer

Lever

Answer

Pulley

Answer

Inclined Plane

Answer

Wheel and Axle

Question 48

Which simple machine is used to split wood?

Accepted Answer

Wedge

Answer

Lever

Answer

Pulley

Answer

Screw

Question 49

What type of simple machine is a bicycle?

Accepted Answer

Wheel and Axle

Answer

Pulley

Answer

Inclined Plane

Answer

Lever

Question 50

Which simple machine is used to move heavy furniture?

Accepted Answer

Inclined Plane

Answer

Screw

Answer

Wedge

Answer

Lever

Question 51

What type of simple machine is a screwdriver?

Accepted Answer

Lever

Answer

Inclined Plane

Answer

Wheel and Axle

Answer

Wedge

Question 52

Which simple machine is used to lift water from a well?

Accepted Answer

Bucket and Rope

Answer

Screw

Answer

Wedge

Answer

Inclined Plane

Question 53

What type of simple machine is a ramp?

Accepted Answer

Inclined Plane

Answer

Wedge

Answer

Lever

Answer

Screw

Question 54

Which simple machine is used to move heavy boxes?

Accepted Answer

Wheelbarrow

Answer

Pulley

Answer

Lever

Answer

Inclined Plane

Question 55

What type of simple machine is a can opener?

Accepted Answer

Lever

Answer

Wheel and Axle

Answer

Inclined Plane

Answer

Wedge

Question 56

What is a lever?

Accepted Answer

A simple machine used to lift or move loads with one end that rests on a fulcrum.

Answer

A type of wheel.

Answer

A machine used for cutting.

Answer

A type of screw.

Question 57

What are the three types of levers?

Accepted Answer

First class, second class, and third class.

Answer

Big class, small class, and medium class.

Answer

Large class, medium class, and small class.

Answer

Hot class, cold class, and neutral class.

Question 58

What is a pulley?

Accepted Answer

A simple machine consisting of a wheel with a grooved rim in which a pulled rope or chain can run.

Answer

A type of inclined plane.

Answer

A type of wedge.

Answer

A type of gear.

Question 59

What are the two types of pulleys?

Accepted Answer

Fixed and movable.

Answer

Fast and slow.

Answer

Large and small.

Answer

Hot and cold.

Question 60

What is the difference between fixed and movable pulleys?

Accepted Answer

Fixed pulleys are attached to a stationary object, while movable pulleys are attached to the object being moved.

Answer

Fixed pulleys are faster than movable pulleys.

Answer

Fixed pulleys are used for lifting objects.

Answer

Movable pulleys are used for cutting.

Question 61

How does a first-class lever work?

Accepted Answer

The fulcrum is located between the effort and the load.

Answer

The effort is located between the load and the fulcrum.

Answer

There is no effort, load or fulcrum.

Answer

The load is located between the fulcrum and the effort.

Question 62

How does a second-class lever work?

Accepted Answer

The load is located between the fulcrum and the effort.

Answer

The effort is located between the load and the fulcrum.

Answer

There is no effort, load or fulcrum.

Answer

The fulcrum is located between the effort and the load.

Question 63

How does a third-class lever work?

Accepted Answer

The effort is located between the fulcrum and the load.

Answer

There is no effort, load or fulcrum.

Answer

The fulcrum is located between the effort and the load.

Answer

The load is located between the fulcrum and the effort.

Question 64

What is the mechanical advantage of a lever?

Accepted Answer

The ratio of the load being moved to the force applied to move it.

Answer

The speed at which the lever moves.

Answer

The temperature of the lever.

Answer

The color of the lever.

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