forces and motion practise test 2

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forces and motion practise test 2

  1. 1. A M E 9 Forces and Motion test Test A Name___________________________ 1. Match up the statements below with the correct word that describes the forces listed in the table. The force that occurs when two objects are in contact (touching) The force that occurs at both ends of a rope or string. The force caused by the pull of gravity. Weight Friction Tension 2. Describe what a friction force does as an object moves over a surface. __________________________________________________________________ 3. Look at the following diagram of the skier. Write two or three sentences to explain…… Why the skier goes faster as she goes down the ski slope. ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ____________________________________________________ ______ Jasmine and Flora are playing a game of soccer. Flora kicks the ball past Jasmine’s weak defenceand scores a goal.Explain, using the help of the diagram below,4a) What forces act on the ball while it is in the air – draw arrows to show the force(s)4b) Why it changes its vertical motion as it moves through the air. _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ ______________________________
  2. 2. 5. A utility truck carrying designer clothes for a Karen Walker fashion parade has become bogged inmud and the back wheels are spinning due to a lack of friction. a) Explain how putting more weight in the back of the truck will help to remove the truck from the mud. ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ ___ b) Explain how placing wooden planks under the wheels of the truck will help increase the friction force on the wheels. ________________________________________________ _____________________________________________________________ _____________________________________________________________ _____________________________________________________________ 6. Name the term given to substances that can reduce friction. ________________________________________________7. Sarah convinces her dad to erect a swing in their back yard. He finds and old tyre and ties it to atree with a piece of rope.(a) On the diagram below, name and draw the forces acting on the swing when there is nobody onthe swing.(b) How do you know that these two are balanced forces?_________________________________________________________________________(c) When Sarah sits on the rope to swing, her weight force pulls down on the rope. Her mass is equalto 60kg. Calculate her weight. g = 10N/kg _____________________________________________________________ _____________________________________________________________ _____________________________________________________________d) Complete the_following table mass in grams mass in kg weight in newton 1200 g 3.20 kg 650 N 400 g 70 g
  3. 3. 8. Look at the following diagrams that represent speed/time graphs. Using the following words, choosewhich best describes the movement shown by each of the graphs. Deceleration, stationary, constantspeed, acceleration. v v v v a) t b) t c) t d) t(a) _______________________________(b) _______________________________(c) _______________________________(d) _______________________________ 9. The following is a distance/time graph of Sarah’s bike ride for a training session on a Saturday afternoon. distance (m) 80 70 60 50 40 30 20 10 time (s) 0 2 4 6 8 10 12 14 16 (i) (ii) (iii) (iv)(a) Describe what is happening at each stage of the journey.(i) ________________________________(ii) ________________________________(iii) ________________________________(iv) ________________________________(b) During the time of constant speed Sarah cycled 600 metres in 48 seconds. Use your calculator to find her speed.___________________________________________________________________________On the line below draw in bars to show what happens to size of the distances she cycled each secondas she(c ) accelerates ____________________________________________________________________(d) decelerates _______________________________________________________________
  4. 4. (e) moves at constant speed ________________________________________________________On a different day Sarah was in car going to Hamilton. She thought she could stay at an average speedof 80 km p hr. She saw a sign to say that the distance to Hamilton was 120 km.(f) If the time was 11.00 am at what time will she reach Hamilton if she keeps at the average speed of 80 km p hr? Explain you answer carefully and fully.___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(g) However Sarah knew that she would be later than this time since she could not expect to keep an average speed of 80 km p hr. Explain why she was expecting to be later:________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(h) Dragsters are fast cars that accelerate quickly, have a short time at constant speed, then usebrakes and a parachute to come slowly to a stop.Draw the shape of the speed-time graph for this motion of a dragster.Graph of Speed vs Time Acceleration Constant speed Deceleration during 0 – 10 s 10 -14 s 14-30 s 10s 14s 30 s Stop! Achieved: 10, or more, A opportunities Final assessment Merit: A + 6 M opportunities Excellence: M + 2E

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