Is the crate accelerating?
The crate has a horizontal acceleration equal to the tension T divided by m, the mass of the crate. What about the forces in the vertical direction? The upward normal force exerted by the floor on the crate, in this situation, is equal to the weight, the downward force of gravity.
What force causes the crate to accelerate forward?
Thus, the friction force acting on the crate will be in the forward horizontal direction and tend to accelerate the crate forward. The crate will slide only when the coefficient of static friction is inadequate to prevent slipping.
What is the acceleration of the crate?
1 Expert Answer Because there is no friction, the net force on the crate is simply the horizontal component of the string tension. That 938cos 40 = the 105 kg times its acceleration. So 719 = 105a and a = 6.84 m/s2.
What is the minimum applied force that gets the crate moving?
We know that normal force on a flat surface is equal and opposite the force of gravity. This force is the minimum force required to start moving the crate.
Are the two forces acting on the box balanced?
The two forces are balanced. forces that are acting in the same direction, add them together. For example, if you pull on a box with a force of 25 newtons (N) while your friend pushes the box (in the same direction you are pulling) with a force of 30 N, the net force applied to the box in that direction is 55 newtons.
Is it easier to start the crate moving or to keep the crate moving?
If you finally push hard enough, the crate seems to slip suddenly and starts to move. Now static friction gives way to kinetic friction. Once in motion, it is easier to keep it in motion than it was to get it started, indicating that the kinetic frictional force is less than the static frictional force.
Which force is friction dependent on?
smoothness
What horizontal force must be applied by the person to keep the crate moving with a constant speed?
Kinetic frictional force
When the box is not sliding What is the friction?
Static friction is the force holding an object in place on an incline, such as the cheese in Figure 1. The friction force points against the direction that the object would slide without friction. Static friction keeps gravity from pulling the cheese down the incline. Figure 1.
What are examples of friction being harmful?
HARMFUL FRICTION
- Slipping on ice.
- Wet roads.
- Mudslides.
What are three examples of using friction?
Everyday Examples of Sliding Friction
- Rubbing both hands together to create heat.
- A sled sliding across snow or ice.
- Skis sliding against snow.
- A person sliding down a slide is an example of sliding friction.
- A coaster sliding against a table.
- A washing machine pushed along a floor.
- An iron being pushed across material.
What are the disadvantages of friction in our daily life?
Three disadvantages of friction are :
- Friction produces heat which damages the moving parts of a machine.
- Friction produces wear and tear on the contacting surfaces. This reduces the life of machine parts, tyres and shoe soles.
- A lot of energy is wasted in overcoming the friction before an object starts moving.
What are the three advantages of friction?
Advantages of friction:
- Friction enables us to walk freely.
- It helps to support ladder against wall.
- It becomes possible to transfer one form of energy to another.
- Objects can be piled up without slipping.
- Breaks of vehicles work due to friction.
- It always resists the motion, so extra energy is required to overcome it.
What is the main cause of friction?
Causes of Friction: Friction is a force that resists the relative motion between two objects or materials. The causes of this resistive force are molecular adhesion, surface roughness, and deformations. Adhesion is the molecular force resulting when two materials are brought into close contact with each other.