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Forces - Resultant Forces

This Physics quiz is called 'Forces - Resultant Forces' and it has been written by teachers to help you if you are studying the subject at senior high school. Playing educational quizzes is one of the most efficienct ways to learn if you are in the 11th or 12th grade - aged 16 to 18.

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Resultant forces are the results of two or more forces acting at the same time. If the resultant force is zero, the effect depends on the initial state of the object. If it is already moving, it will continue to move at the same velocity, in other words, at the same speed and in the same direction as when the resultant forces became zero. If it was stationary to begin with, then it will remain stationary. Resultant forces occur in our daily lives, every day we encounter them but we tend not to consider them. Every time something moves, it is because the resultant forces are not zero.

1.
The overall effect of the forces acting on an object will NOT ...
cause it to accelerate
cause it to decelerate
cause it to remain stationary
cause its watch to change
Easy start, making sure that you understand the effect that forces have on objects
2.
What is a resultant force?
A single force which has the same effect on motion as a number of forces acting at a point
When no forces are acting on a variety of points
A single force which has the same effect on motion as a number of forces acting at a number of different points
49 forces acting on 79 points
Forces are vector quantities and you need to take into account both their magnitude and direction
3.
What could the effect of a resultant force be?
Cause a change in state of rest or motion
Resultant forces do not have any effect on anything
Resultant forces only affect waves
Resultant forces do not exist
If a resultant force is zero, the state of rest or motion will remain unchanged
4.
If an object is stationary and the resultant force acting upon it is zero, what will happen to the object?
It will accelerate at 1 m/s2
It will accelerate at 2 m/s2
It will accelerate at 3 m/s2
It will accelerate at 0 m/s2
In other words, it remains at rest
5.
If an object is stationary and the resultant force acting upon it is non-zero, what will happen to the object?
It will remain stationary
It will move towards the direction of the resultant force
It will move in the direction of the resultant force
It will explode
Whilst the resultant force is non-zero, not only will the object move, it will be accelerating
6.
If an object is moving west at a speed of 3 m/s and the resultant force acting upon it is zero, what will happen to the object?
Move east at 3 m/s
Move north at 3 m/s
Continues moving west at 3 m/s
Come to rest
If an object is moving and the resultant force on the object is zero it will continue to travel in its current path at a constant speed
7.
The driving force exerted by a motorbike is 2000 N. The resultant force acting in a forward direction is 200 N. What is the size of the opposing force (air resistance and friction)?
1800 N
200 N
1900 N
2000 N
Working out the magnitude of resultant forces acting in direct opposition to each other is simply a matter of subtraction
8.
If a ball is traveling at a speed of 3 m/s west and encounters a force which slows the ball at a rate of 0.25 m/s, how long does the ball take to stop?
3 seconds
6 seconds
9 seconds
12 seconds
Divide the velocity by the deceleration
9.
A person pushes on a box with a force of 10 N which does not move. Assuming no other forces are present, what is the size of the force the box exerts on the person?
5 N
10 N
15 N
20 N
Testing that you understand Newton's third law and resultant forces in the same question
10.
Two forces act on a small ball. One force exerts a force of 10 N east, whilst the other force exerts a force of 15 N west. What is the size and direction of the resultant force?
5 N east
5 N west
10 N east
10 N west
East and west indicate that the forces are pushing in directly opposing directions therefore the resultant will be the difference between them, in the direction of the larger one
Author:  Martin Moore