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