# Year 7 forces their effects and

This is because: a. The floor surface offers resistance to the movement of the box. Static friction results when the surfaces of two objects are at rest relative to one another and a force exists on one of the objects to set it into motion relative to the other object.

On the moon's surface, g is 1. What is Friction? Friction can be helpful as in the friction that allows a person to walk across the ground without sliding or it can be destructive such as the friction of moving parts in a motor that rub together over long periods of time.

In general, values of static friction coefficients are greater than the values of sliding friction coefficients for the same two surfaces. Sliding friction results when an object slides across a surface. Flickr Physics Photo A 1. This causes a force that pulls equally in both directions. Even on the surface of the Earth, there are local variations in the value of g that have very small effects upon an object's weight.

### Year 7 forces worksheet pdf

Friction can be helpful as in the friction that allows a person to walk across the ground without sliding or it can be destructive such as the friction of moving parts in a motor that rub together over long periods of time. Sliding friction forces can be calculated from knowledge of the coefficient of friction and the normal force exerted upon the object by the surface it is sliding across. Use the Gravitational Fields widget below to investigate how location affects the value of g. Yet the two surfaces were not able to provide 26 Newton of static friction force. The 'kick' from the firing of the ammunition is what makes the cannon jump backwards. When you pick up a pencil, it's friction with your fingers that gets the pencil in motion. A force has both magnitude and direction. It states that for every force and action, there is an equal and opposite reaction. And that's exactly what you do when you use one of The Physics Classroom's Interactives. Resisting Forces Resisting force , like air resistance or friction, change motion.

The 'kick' from the firing of the ammunition is what makes the cannon jump backwards. On earth's surface g is 9.

### Year 7 forces worksheet

You probably can't do it because the force of friction between the train and the ground is more intense. Of course it wants to straighten out so it exerts an upward force on the object. Friction forces can also exist when the two surfaces are not sliding across each other. On the other hand, the weight of an object measured in Newton will vary according to where in the universe the object is. Sometimes it isn't enough to just read about it. Inertia is actually not a force at all, but rather a property that all things have due to the fact that they have mass. If there is no interaction, the objects no longer experience the force. The more mass something has the more inertia it has. Sliding friction results when an object slides across a surface. For example, a 2-kg object will have a mass of 2 kg whether it is located on Earth, the moon, or Jupiter; its mass will be 2 kg whether it is moving or not at least for purposes of our study ; and its mass will be 2 kg whether it is being pushed upon or not. Click on a Topic:.

Sliding versus Static Friction As mentioned abovethe friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it.

Then suppose that you were to increase the force to 26 Newton and the box finally budged from its resting position and was set into motion across the floor. Rated 6/10 based on 51 review