MCQs | Chapter 4 | Kinematics | 9th Physics | Cantab Publisher Lahore | FBISE скачать в хорошем качестве

MCQs | Chapter 4 | Kinematics | 9th Physics | Cantab Publisher Lahore | FBISE

Click on the link below for latest videos. https://whatsapp.com/channel/0029VaGr... The diagram shows the speed-time graph for an object moving with constant acceleration. (a) 0.67m (b) 1.5m (c) 12m (d) 24m Skydiver is falling at terminal velocity. Which row describes the acceleration of the skydiver and the velocity of the skydiver? Acceleration of the skydiver Velocity of the skydiver (a) Downwards Constant (b) Downwards Zero (c) Zero Constant (d) zero Zero A ball starts from rest and rolls down a steep slope. The ball then rolls along rough horizontal ground. Which graph shows the speed of the ball at different times? Which part of the distance-time graph shows the fastest constant speed? A skier slides down a slope. The figure shows how his speed varies with time. What is his average acceleration during the 6.0s? (a) 2.2m/s^2 (b) 4.3m/s^2 (c) 8.0m/s^2 (d) 13.0m/s^2 A woman runs 2.0km from X to Y in 20 minutes and then rests at Y for 10 minutes. She then takes 10 minutes to run 1.6km from Y to Z. What is the size of her average velocity for the journey from X to Z? (a) 0.060km/minute (b) 0.080km/minute (c) 0.090km/minute (d) 0.130km/minute A cyclist travelling in a straight line at 8.0m/s accelerates to 12m/s in a time of 6.0s. Which expression gives the cyclist’s acceleration? (a) 6/(12-8) (b) 8/(12-6) (c) (12-8)/6 (d) (12-6)/8 The diagram shows the distance-time graph for a moving object. What is the moving object? (a) A ball thrown vertically upwards and falling back to the thrower (b) A car starting from rest, speeding up as it moves away from a traffic signal (c) A rock dropped from a high cliff, falling into the sea below (d) A train braking to a halt as it stops at a station Which speed-time graph represents the motion of a railway train making a short stop at a station? Parts of a speed-time graph for two runners are shown. They are running along the same track. If the distances ceovered by the runners are S_1 and S_2, then which of the following is true? (a) S_1greater then S_2 (b) S_1 less then S_2 (c) S_1= S_2 (d) cannot be predicted In the above question 10, which statement must be correct? (a) Both runners started at the same moment (b) Runner 1 has a greater acceleration than runner 2 (c) Runner 1 is moving faster than runner 2 (d) The distance between the two runners stays constant In which descent is the acceleration equal to the acceleration of free fall g at all times? (a) A bungee jumper leaping from a bridge (b) A feather falling in a vertical tube that contains vacuum (c) A hailstone travelling to Earth at terminal velocity (d) A sky-diver dropping from an aircraft towards the ground Which of the two speed or velocity always requires a specific direction? Can the distance traveled by an object be less than its displacement? If an object is said to have a velocity of 20m/s north, what does “north” signify in this context? What is the difference between average speed and instantaneous speed? Can the average speed of a journey be zero? Explain Can the average speed and instantaneous speed of an object be the same at some point during its journey? What do we mean when we say something is “falling freely”? How much faster does a free-falling object get every second? Free fall speed increases by about 10m/s every second. Why do we say “m/s^2” instead of “m/s”? Draw a speed time graph for an object dropped from a certain height by ignoring air effects. If you throw an object up, how much speed does it lose every second (if we forget about air slowing it down)? How far will an object have fallen in 1 second if you just let it go? And after 4 seconds? A stone dropped from the top of a really tall tower. Let us not worry about the wind and assume gravity pulls it down at a steady 10m/s^2. The taken by the stone to gain a speed of 100m/s. An object drops from a still helicopter and when it lands, it is going 30m/s. How long did it take for the object to hit the ground and how much distance did it cover in that time? (ignore air effects) A cat jumps off a ledge and hits the ground in half a second? (a) How fast is it going when it hits the ground? (b) What is its average speed during the jump? (c) How tall is the ledge? On the speedometer of a car which starts from, if you record the speed of 50km/h attained in one-half hour, what is your average speed? In the above question, find the distance covered by the car in one-half hour. If you drive 100 kilometers in 2 hours, stop for 1 hour, then drive another 100 kilometers in 2 hours, what is your average speed for the entire journey? If an athlete runs 400 meters in 50 seconds and then walks 200 meters in 150 seconds, estimate the instantaneous speed in 50 seconds. What is your average speed if you walk 10 meters forward and then 10 meters backward in 20 seconds? Also find average velocity on reaching back to the initial point.