give two example to show that force can change the speed of an object
Answers
Explanation:
when we are pushing a stationary car then I started to change its speed another example is when we are pushing a moving vehicle then it started to move more fast
Answer:
You have probably heard the word "force" before in conversations. Here are a few examples: "the rocket had a lot of force at blast off" or "the force of the storm blew the roof off the building." What is force? Force is defined as a push or pull on an object.
girl riding bicycle
When you ride a bike, your foot pushes against the pedal. The push makes the wheels of the bike move.
apple falling from a tree
When an apple falls from a tree, it is pulled to the ground by gravity.
Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving.
Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity. Remember that acceleration is a change in velocity. So forces cause acceleration.
Remember the following things about forces:
Forces are measured in Newtons (N).
Forces act in pairs.
Forces act in a particular direction.
Forces usually cannot be seen, but their effects can.
Sources of images used for this section as they appear, top to bottom:
Transportation-Bicycle, Animated Gifs
Apple Falling, NASA
Types of Forces
There are several types of forces that act on you and objects around you all the time. There are two main groups of forces: contact forces and distance forces.
Interactive exercise. Assistance may be required. Click on the image map below to learn more about the different types of forces.
Balanced Forces
Often, more than one force can act upon an object at a time, and the forces can push or pull in any direction. What happens to the object when forces act upon it depends on the following two things:
The strength of the forces
The direction of the forces
When more than one force acts on an object, the forces combine to form a net force. The combination of all the forces acting on an object is the net force.
two men pulling on a fishing pole
two men playing tug of war with a rope
If two forces of equal strength act on an object in opposite directions, the forces will cancel, resulting in a net force of zero and no movement. Two or more opposite forces are balanced forces if their effects cancel each other and they do not cause a change in an object's motion.
Unbalanced Forces
If the effects of the forces do not cancel each other, or if one force is stronger than the other, the forces are unbalanced forces. Unbalanced forces cause a change in motion, speed, and/or direction.
When two forces act in the same direction on an object, the net force is equal to the sum of the two forces. In the example below, the net force would be 900 Newtons (450 + 450 = 900), and the object would move to the right.
When two unequal forces act in opposite directions on an object, the net force is the difference of the two forces. In the example below, the net force would be 50 Newtons (500 - 450 = 50), and the object would move to the left because the force pulling to the left is greater.
Find the Net Force
Interactive exercise. Assistance may be required. In the problems below, find the net force, and then select what direction the object will move. The dot represents the object the forces are acting upon and the arrows show the direction the force is moving.