Physics

Question 1

Define mass.

Answer 1

The amount of matter in an object, typically measured in kilograms.

Question 2

True or false: Weight is the force of gravity on an object.

Answer 2

TRUE

Weight is calculated as mass times gravitational acceleration.

Question 3

Fill in the blank: Energy is the ability to do ______.

Answer 3

work

Question 4

What is kinetic energy?

Answer 4

The energy an object possesses due to its motion.

Question 5

Define potential energy.

Answer 5

Energy stored in an object due to its position or state.

Question 6

What is the law of conservation of energy?

Answer 6

Energy cannot be created or destroyed, only transformed.

Question 7

True or false: Friction always acts in the direction of motion.

Answer 7

FALSE

Friction opposes the direction of motion.

Question 8

What is acceleration?

Answer 8

The rate of change of velocity of an object.

Question 9

Fill in the blank: Force is mass times ______.

Answer 9

acceleration

Question 10

Define velocity.

Answer 10

The speed of an object in a given direction.

Question 11

What does Newton’s first law state?

Answer 11

An object at rest stays at rest unless acted upon by a force.

Question 12

True or false: Work is done when a force moves an object.

Answer 12

TRUE

Work is calculated as force times distance.

Question 13

What is power?

Answer 13

The rate at which work is done or energy is transferred.

Question 14

Fill in the blank: Waves transfer ______ without transferring matter.

Answer 14

energy

Question 15

Define frequency.

Answer 15

The number of waves that pass a point in one second.

Question 16

What is the speed of light?

Answer 16

Approximately 299,792 kilometers per second in a vacuum.

Question 17

True or false: Sound travels faster in air than in water.

Answer 17

FALSE

Sound travels faster in water due to higher density.

Question 18

What is refraction?

Answer 18

The bending of light as it passes from one medium to another.

Question 19

Fill in the blank: Electric current is the flow of ______.

Answer 19

electric charge

Question 20

Define voltage.

Answer 20

The difference in electric potential energy per unit charge.

Question 21

What is Ohm’s law?

Answer 21

The relationship between voltage, current, and resistance: V = IR.

Question 22

True or false: Magnetic fields can exert forces on moving charges.

Answer 22

TRUE

This is the principle behind electric motors.

Question 23

What is static electricity?

Answer 23

Electric charge that accumulates on the surface of objects.

Question 24

Fill in the blank: Thermal energy is related to the ______ of particles.

Answer 24

motion

Question 25

Define **conduction**.

Answer 25

The transfer of heat through direct contact between materials.

Question 26

What is **convection**?

Answer 26

The transfer of heat by the movement of fluids.

Question 27

True or false: **Radiation** requires a medium to transfer heat.

Answer 27

FALSE ## Footnote Radiation can occur through a vacuum.

Question 28

What is **insulation**?

Answer 28

Materials that reduce the transfer of heat.