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P5: Quiz 4 – Answers
P5: Quiz 4 – Answers
1) The resultant force on an object is the overall force acting on an object in one direction
2) 4 N to the right
3) 6 N to the left
4) 14 N
5)
a)
i) The object will remain stationary
ii) The object will continue moving with the same velocity
b) The 5 are:
6)
a) The driving force will be going to the right and have a label of 350 N. The resistive force will be going towards the left and have a label of 200 N
2) 4 N to the right
3) 6 N to the left
4) 14 N
5)
a)
i) The object will remain stationary
ii) The object will continue moving with the same velocity
b) The 5 are:
- start moving
- stop moving
- speed up (accelerate)
- slow down (decelerate)
- change direction
6)
a) The driving force will be going to the right and have a label of 350 N. The resistive force will be going towards the left and have a label of 200 N
b) 150 N to the right
c) The resultant force is 150 N to the right, which means that the cyclist will accelerate towards the right. As the cyclist is already travelling towards the right, his velocity will increase
7)
a) An arrow towards the right with a label of 1,900 N
c) The resultant force is 150 N to the right, which means that the cyclist will accelerate towards the right. As the cyclist is already travelling towards the right, his velocity will increase
7)
a) An arrow towards the right with a label of 1,900 N
b) 400 N to the left
c) The resultant force is 400 N to the left, which means that the car will accelerate towards the left. As the car is travelling towards the right, an acceleration towards the left will mean that the velocity of the car will decrease (the car will slow down)
8)
a) 0 N
b) A downwards arrow for weight and an upwards arrow for the normal reaction force. Both of the arrows need to be labelled
c) The resultant force is 400 N to the left, which means that the car will accelerate towards the left. As the car is travelling towards the right, an acceleration towards the left will mean that the velocity of the car will decrease (the car will slow down)
8)
a) 0 N
b) A downwards arrow for weight and an upwards arrow for the normal reaction force. Both of the arrows need to be labelled
9) 3 N to the left
Questions
1) Define resultant force.
2) Work out the resultant force acting on the ball below.
1) Define resultant force.
2) Work out the resultant force acting on the ball below.
3) Work out the resultant force acting on the ball below.
4) A ball has two forces acting on it; one force is acting towards the right and the other force is acting towards the left.
The resultant force acting on the ball is 6 N towards the left. Work out the size of the force acting towards the left.
5)
a)
i) If the resultant force acting on a stationary object is 0, what will happen to the object?
ii) If the resultant force acting on a moving object is 0, what will happen to the object?
b) If the resultant force acting on an object is non-zero, what are the 5 different things that can happen to the object?
6) The cyclist below is travelling towards the right.
5)
a)
i) If the resultant force acting on a stationary object is 0, what will happen to the object?
ii) If the resultant force acting on a moving object is 0, what will happen to the object?
b) If the resultant force acting on an object is non-zero, what are the 5 different things that can happen to the object?
6) The cyclist below is travelling towards the right.
The cyclist provides a driving force of 350 N. The resistive forces (air resistance and friction) are 200 N.
a) Add the driving force and the resistive forces to the sketch of a bike. Do not worry about the lengths of the arrows.
b) Work out the resultant force.
c) What will happen to the motion/ velocity of the cyclist? Explain your answer.
7) The car below is travelling towards the right. The two resistive forces (air resistance and friction) are shown on the diagram below.
a) Add the driving force and the resistive forces to the sketch of a bike. Do not worry about the lengths of the arrows.
b) Work out the resultant force.
c) What will happen to the motion/ velocity of the cyclist? Explain your answer.
7) The car below is travelling towards the right. The two resistive forces (air resistance and friction) are shown on the diagram below.
a) The driving force is 1,900 N. Add this to the diagram. Do not worry about the lengths of the arrows.
b) What is the resultant force acting on the car?
c) What will happen to the motion/ velocity of the car? Explain your answer.
8) The diagram below shows a book sitting on top of a table.
b) What is the resultant force acting on the car?
c) What will happen to the motion/ velocity of the car? Explain your answer.
8) The diagram below shows a book sitting on top of a table.
The book is stationary (it stays on the table in the same position).
a) What is the resultant force acting on the book?
b) Draw and label the two forces acting on the book.
9) There are many forces acting on the ball below. The forces are acting up, down, left and right.
a) What is the resultant force acting on the book?
b) Draw and label the two forces acting on the book.
9) There are many forces acting on the ball below. The forces are acting up, down, left and right.
Find the resultant force acting on the ball.