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