Forces Homework Booklet
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1 Forces Homework Booklet Name: Class: Homework Number % Mark Parental Signature
2 Homework 1. Use the proper layout, and show all your working to answer the following questions. 1. Calculate how far a car travels in 300 seconds when it is travelling at a top speed of 30 m/s. 2. How long does it take to walk to school if you walk at an average speed of 3 m/s and you live 900 metres away? 3. Find the average speed of a motor boat which takes 350 seconds to cover a m course.
3 4. A runner takes 35 seconds to run round 250 metres of a track. What is his average speed? 5. A train travelling at 35 m/s takes 15 seconds to pass through a tunnel. How long is the tunnel? Total 15 marks
4 Homework Find the average speed of Sammy Snail who slithers m in 4 seconds. 2. How long does the TGV train take to travel m given that it goes at an average speed of 120 km/h. (120 km/h = 33 3 m/s) 3. A school bus takes 20 minutes to travel 15 km. What is it s average speed? (Give your answer in m/s)
5 4. A bird maintains an average speed of 11 2 m/s for 5 minutes. How far does it travel? 5. How long does a roller-blader take to travel 2 km if his average speed is 7 m/s. Total 15 marks
6 Homework A car travels from rest to 65 m/s in 10 seconds. What is its acceleration? 2. A speedboat travels from rest to 56 m/s in 56 seconds. What is its acceleration? 3. A cyclist accelerates from 0 m/s to 8 m/s in 3 seconds. What is its acceleration?
7 4. A lizard accelerates from 2 m/s to 10 m/s in 4 seconds. What is the lizard s average acceleration? 5. A car advertisement states that a certain car can accelerate from rest to 70 km/h in 7 seconds. Find the cars average acceleration. Total 15 marks
8 Homework Name TWO ways in which you can apply a force to an object. (a) (b) (2) 2. Name TWO things that a force can do to an object. (a) (b) (2) 3 (a) When two surfaces move against each other, a force is always present. Name this force. (b) Give an example of a situation where we would like to reduce this force. (c) Give an example of a situation where we would like to increase this force.
9 4. What unit is force measured in? 5. Some aircraft land at a high speed. Explain how the parachute helps to slow down the aircraft: (2) Total 10 marks
10 Homework Complete the following using words from the word bank below. Smoother, motion, lubricating (oiling), rougher, opposes, slow down. Friction is a force which the motion of an object. It can cause an object to or to stop. We can increase the force of friction between two surfaces by making the surfaces. We can reduce the force of friction between two surfaces by making them. Another way of reducing friction between two surfaces is by them. (5) 2. Circle whether this is a situation where friction is useful (good) or unhelpful (bad). a) A rusty hinge Good/Bad b) An air hockey game Good/Bad c) A goalies gloves Good/Bad d) A slide in the playground Good/Bad e) The brakes on a bicycle Good/Bad f) Car tyres Good/Bad (6) 3. What is a force? Total 12 marks
11 Homework (a) Look at the picture below, Explain what part X of the truck is there to do. X (b) Complete the statement by deleting the incorrect word. Part X will help the truck to use MORE/LESS fuel. 2. The two sheets of paper shown at dropped at the same time. Complete the sentence below. A Flat sheet of paper B Crumpled sheet of paper Sheet will hit the floor first. Explain your choice. [Turn over
12 3. Explain the two methods being used to reduce air friction, so that the motorbike will go as fast as possible: (2) 4. Give an example of a situation where a large air resistance is useful. Explain how air resistance is being used. (2) 5. Find out what a wind tunnel is, and what it is used for. (2) Total 10 marks
13 Homework Complete the following: Mass is the amount of material in an object, mass is measured in. Weight is a due to. Here on Earth g = 10 N/kg, bwe call g the. (2) 2. When we travel to other planets, the value of g changes. This means that your will change, but your will always stay the same. (2) 3. Find the missing values in the following table. (Show all your working.) Weight Mass g (a) (b) (c) (6)
14 Homework 8. Planet Gravitational Field Strength (N/kg) Earth 10 Moon 1.6 Mercury 4 Jupiter 2 Saturn 9 Neptune Find the weight of a 50 kg person on Earth. 2. Find the mass of Mary who has a weight of 625 N.
15 3. An alien has a mass of 120 kg. He says that on his own planet, he has a weight of 1320 N. What planet is he from? (4) 4. An astronaut has a weight of 800 N on Earth. What is his mass: (a) on Earth (b) on the Moon (c) in outer space? (a) (b) (c) Total 15 marks
16 Homework Explain what is meant by an unbalanced force. (2) 2. For the situations shown below, calculate the size and direction of the unbalanced force. 20 N 50 N 10 N 200 N 100 N (2) (2) 10 N 20 N 20 N 10 N (2) (2)
17 Homework What are the two quantities that Pressure depends on? (2) 2. How could you calculate the Pressure if you know these quantities? 3. What unit is Pressure measured in? 3. Give three examples of a force acting on a small area to give high Pressure. (i) (ii) (iii) 4. Give three examples of a force acting over a large area to give small Pressure. (i) (ii) (iii) [Turn over
18 5. Calculate the Pressure caused by a Force of N acting over an area of 100 cm Using your knowledge of Physics, explain how drawing pins are able to be pushed into notice boards. (2) Total 15 marks
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