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