A) a push only B) neither a push nor a pull C) a push or pull or both D) a pull only B.
A) Joules B) Pouds C) Calorie D) Newtons
A) tension B) magnetic C) friction D) normal
A) 50 N B) 250 N C) 1000 N D) 500 N
A) applied B) friction C) tension D) gravitational
A) Air resistance only B) Applied force and air resistance C) Gravitational force only D) Air resistance and gravitational forces
A) Contact forces B) Non-contact forces C) Balanced forces D) Unbalanced forces
A) magnitude B) Direction of the force C) line of action D) Velocity of the object
A) Sand B) Muddy road C) Concrete road D) Grass
A) Thomas Edison B) Isaac Newton C) Alexander Graham Bell D) Aristotle
A) Acceleration B) Inertia C) Action and Reaction D) Gravity
A) Friction only B) Its own inertia C) Its weight D) A net external force
A) Weight B) Velocity C) Momentum D) Acceleration
A) W = Fd B) KE = ½ mv² C) P = W/t D) F = ma
A) A stronger push B) A smaller force C) No effect D) An equal and opposite reaction
A) Do work B) Increase inertia C) Exert force D) Apply mass
A) Velocity and force B) Kinetic and potential C) Heat and light D) Work and power
A) KE = ½ mv² B) KE = Pt C) KE = Fd D) KE = mgh
A) Gravity B) The wall does nothing C) The wall pushes back with equal force D) Friction
A) A 10-kg box B) A 5-kg dog C) A 1-kg rock D) A feather
A) Law of gravitation B) First C) Third D) Second
A) Jumping off a skateboard B) A car accelerating C) Walking D) Recoil of a gun
A) Nuclear B) Chemical C) Kinetic D) Potential
A) Potential B) Power C) Kinetic D) Work
A) Water behind a dam B) A ball at rest on a table C) A moving car D) A stretched bow
A) Kinetic → potential B) Work → power C) Power → potential D) Potential → kinetic
A) Gravity B) Normal force C) Tension D) Friction
A) Friction B) Tension C) Normal force D) Gravitational force
A) Friction B) Applied force C) Weight D) Normal force
A) Friction B) Gravity C) Magnetic force D) Applied force
A) Friction B) Tension C) Normal force D) Gravity
A) Normal force B) Tension force C) Magnetic force D) Gravity
A) Electric force B) Gravity C) Magnetic force D) Normal force
A) Tension B) Friction C) Normal force D) Gravity
A) Magnetic force B) Gravity C) Friction D) Normal force
A) 15 N B) 5 N C) 20 N D) 10 N
A) 200,000 J B) 20,000 J C) 100,000 J D) 400,000 J
A) Red B) Yellow C) Blue D) Violet
A) X-ray B) Infrared C) Ultraviolet D) Microwave
A) Doubles B) Decreases C) Stays the same D) Increases
A) Infrared B) Visible light C) Ultraviolet D) Radio
A) To block sound B) To reduce heat C) To block harmful radiation D) To reflect visible light
A) Ultraviolet B) Infrared C) Gamma rays D) Microwaves
A) Ultraviolet lamps B) Microwave ovens C) Television broadcasts D) MRI scanning
A) Gamma rays B) Infrared C) Ultraviolet D) Radio waves
A) Using radio waves for broadcasting signals B) Using ultraviolet light for Wi-Fi C) Using X-rays for satellite internet D) Using gamma rays in mobile phones
A) Incorrect, because energy disappears in midair B) Correct, because gravity cancels all energy C) Correct, because the ball stops moving D) Incorrect, because it has potential energy at the top
A) Push both objects on a table B) Use a balance to measure weight C) Shine light on both objects D) Drop a feather and stone at the same time without air resistance
A) Correct, because energy is used B) Incorrect, because no displacement occurs C) Correct, because mass is constant D) Correct, because force is applied
A) Measuring speed on a ramp B) Weighing objects on a scale C) Letting two skaters push off each other D) Dropping a ball and watching it bounce |