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