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Physics: Forces and Energy

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Types of Energy and Energy Transformations

Subtopic

Types of Energy and Energy Transformations under Physics: Forces and Energy for Grade 8 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    If an object is stationary (not moving), its kinetic energy is:

    A.

    At its maximum

    B.

    Zero

    C.

    Increasing

    D.

    Equal to its mass

  2. 2.

    Which energy transformation takes place in a battery-operated toy car that is moving?

    A.

    Chemical to Electrical to Kinetic

    B.

    Kinetic to Chemical to Light

    C.

    Nuclear to Thermal to Sound

    D.

    Elastic to Potential to Kinetic

  3. 3.

    What happens to the gravitational potential energy of an elevator as it rises from the ground floor to the 10th floor?

    A.

    It decreases

    B.

    It increases

    C.

    It stays the same

    D.

    It turns into nuclear energy

Download the worksheet for Physics: Forces and Energy - Types of Energy and Energy Transformations to practice offline. It includes additional chapter-level practice questions.

Kinetic and Potential Energy

Subtopic

Kinetic and Potential Energy under Physics: Forces and Energy for Grade 8 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    If an object is moved to a planet where the gravity is twice as strong as Earth's, how would its GPEGPE at a height of 1 meter1\ meter compare to its GPEGPE at 1 meter1\ meter on Earth?

    A.

    It would be the same

    B.

    It would be half as much

    C.

    It would be twice as much

    D.

    It would be four times as much

  2. 2.

    A 0.5 kg0.5\ kg bird is flying at a constant speed of 2 m/s2\ m/s. What is its kinetic energy?

    A.

    0.5 J0.5\ J

    B.

    1.0 J1.0\ J

    C.

    2.0 J2.0\ J

    D.

    4.0 J4.0\ J

  3. 3.

    When an object is lifted vertically, the work done on the object is numerically equal to its change in:

    A.

    Kinetic energy

    B.

    Gravitational potential energy

    C.

    Chemical energy

    D.

    Speed

Download the worksheet for Physics: Forces and Energy - Kinetic and Potential Energy to practice offline. It includes additional chapter-level practice questions.

Contact and Non-contact Forces

Subtopic

Contact and Non-contact Forces under Physics: Forces and Energy for Grade 8 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    If a force of 10 N10\ N is applied to the left and 10 N10\ N is applied to the right on an object, what is the resultant force?

    A.

    20 N20\ N to the left

    B.

    20 N20\ N to the right

    C.

    10 N10\ N upwards

    D.

    0 N0\ N

  2. 2.

    Which force is experienced by an airplane as it flies through the sky, opposing its forward motion?

    A.

    Gravity

    B.

    Upthrust

    C.

    Drag

    D.

    Magnetism

  3. 3.

    Why do hiking boots have deep treads on the soles?

    A.

    To decrease friction

    B.

    To increase friction

    C.

    To reduce weight

    D.

    To attract magnets

Download the worksheet for Physics: Forces and Energy - Contact and Non-contact Forces to practice offline. It includes additional chapter-level practice questions.

Newton’s Laws of Motion

Subtopic

Newton’s Laws of Motion under Physics: Forces and Energy for Grade 8 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    If you are pushing a box with a force of 10 N10\text{ N} to the right, and your friend pushes it with 5 N5\text{ N} to the left, what is the net force?

    A.

    15 N15\text{ N} to the right

    B.

    5 N5\text{ N} to the right

    C.

    5 N5\text{ N} to the left

    D.

    50 N50\text{ N} to the right

  2. 2.

    A lamp hangs stationary from a ceiling. What is the net force acting on the lamp?

    A.

    9.8 N9.8\text{ N}

    B.

    0 N0\text{ N}

    C.

    Equal to its mass

    D.

    Infinite

  3. 3.

    Lubricants like oil are used in engines primarily to:

    A.

    Increase the mass of the engine

    B.

    Decrease friction between moving parts

    C.

    Increase the force of the engine

    D.

    Help the engine accelerate faster

Download the worksheet for Physics: Forces and Energy - Newton’s Laws of Motion to practice offline. It includes additional chapter-level practice questions.

Wave Properties (Light and Sound)

Subtopic

Wave Properties (Light and Sound) under Physics: Forces and Energy for Grade 8 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Which property of a wave is measured from the rest position to the crest?

    A.

    Wavelength

    B.

    Period

    C.

    Amplitude

    D.

    Frequency

  2. 2.

    A wave has a frequency of 100Hz100 Hz and a wavelength of 3m3 m. What is its speed?

    A.

    33.3m/s33.3 m/s

    B.

    300m/s300 m/s

    C.

    0.03m/s0.03 m/s

    D.

    103m/s103 m/s

  3. 3.

    What color do you get if you mix red and green light?

    A.

    Magenta

    B.

    Cyan

    C.

    Yellow

    D.

    White

Download the worksheet for Physics: Forces and Energy - Wave Properties (Light and Sound) to practice offline. It includes additional chapter-level practice questions.

Physics: Forces and Energy - Grade 8 Science (IB) | Krit.club