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Question 1
This question is about types of force. |
a) | Which of these is not a possible effect of a force? A change in direction B change in speed C change in shape D change in mass
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b) | Which of the following is the correct unit for force? A Nm B N C m/s D kg/m3
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c) | Complete the table below by sorting the forces below into contact and non-contact forces. Model answer
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Question 2
A car is accelerating along a horizontal road. |
a) | Label the thrust, air resistance, weight, and normal reaction acting on the car as it accelerates long the horizontal road.
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b) | The driving force of the car is 1,850 N and the air resistance is 420 N. Calculate the resultant force acting on the car.
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c) | The car continues to accelerate at a decreasing rate until it reaches top speed. Explain, with reference to the forces acting on the car, why a top speed is reached. You may assume that the maximum thrust force is constant.
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Question 3
This question is about the forces acting on a cyclist as they travel along a horizontal road. |
a) | Forces are vector quantities. State what is meant by a vector quantity.
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b) | The cyclist is travelling at constant velocity along the road. Give the resultant force on the cyclist and bike.
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c) | The cyclist decides to speed up and begins to pedal faster. The cyclist and bike have a mass of 110 kg. The cyclist has a thrust force of 205 N, resulting in an acceleration of 1.5 m/s2. Calculate the drag forces acting on the cyclist and bicycle.
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Question 4
This question is about the forces acting on a ball as it falls towards the ground. |
a) | Label the forces acting on the ball as it accelerates towards the ground.
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b) | At the instant shown in the diagram, the air resistance is 0.4 N. The ball has a mass of 200 g. Calculate the resultant force acting on the ball. The gravitational field strength on earth is 9.8 N/kg.
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c) | As the ball falls, the acceleration decreases and eventually becomes zero. At this point, the ball is falling at terminal velocity. State the value of air resistance when the ball is travelling at terminal velocity.
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Question 5
The diagram below shows the forces acting on a cyclist as he travels along a horizontal road. |
a) | State the name of the force labelled A.
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b) | State the name of the force labelled B.
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c) | Describe the motion of the cyclist. You should refer to the forces acting on the cyclist in your answer.
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d) | The cyclist and bike have a combined mass of 105 kg. The cyclist applies 200 N of thrust and there is 80 N of air resistance. Calculate the acceleration of the cyclist in m/s2. Give your answer to 2 decimal places.
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Question 6
This question is about types of forces. |
a) | Which of the following is responsible for objects falling towards the ground when released? A friction B air resistance C gravity D thrust
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b) | Which of the following is the force responsible for a sky diver reaching terminal velocity? A air resistance B weight C thrust D magnetic
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c) | Forces are vector quantities. This means they have: A magnitude (size) only B direction only C magnitude and direction D any of the above
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d) | A car has a thrust force of 1,500 N and a drag force of 600 N. What is the resultant force acting on the car? A 2,100 N B 900 N C -900 N D 2.5 N
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e) | A skydiver has a weight of 600 N. What is the resultant force acting on the skydiver when they are travelling at terminal velocity? A 600 N B 6,000 N C 60 N D 0 N
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