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### Calculating the Acceleration of an Object in Simple Harmonic Motion

In physics, you can calculate the acceleration of an object in simple harmonic motion as it moves in a circle; all you need to know is the object’s path radius and angular velocity. [more…]

### Understanding Buoyancy Using Archimedes’s Principle

In physics, *Archimedes’s principle* says that any fluid exerts a buoyant force on an object wholly or partially submerged in it, and the magnitude of the buoyant force equals the weight of the fluid displaced [more…]

### How Torque Causes Angular Acceleration

In physics, when you rotate an extended object, such as a rod, disk, or cube, which has its mass distributed through space, you have to take into account where the force is applied. Enter torque. [more…]

### How Simple Harmonic Motion Works in Horizontal and Vertical Springs

In physics, when the net force acting on an object is elastic (such as on a vertical or horizontal spring), the object can undergo a simple oscillatory motion called [more…]

### Using a Pulley to Demonstrate Newton’s Third Law

In physics, no force can be exerted without an equal and opposite force (even if some of that opposing force comes from making an object accelerate). A rope and pulley can act together to change the direction [more…]

### Calculating the Force Needed to Move an Object Up a Slope

In physics, when frictional forces are acting on a sloped surface such as a ramp, the angle of the ramp tilts the normal force at an angle. When you work out the frictional forces, you need to take this [more…]

### Measure Liquid Flow Using the Equation of Continuity

In physics, if a fluid is flowing at a certain speed at a certain point in a system of pipes, you can predict what its speed will be at another point by using the [more…]

### How to Determine the Direction of Angular Velocity

In physics, when a wheel is spinning, it has not only an angular speed but also a direction. Here’s what the angular velocity vector tells you: [more…]

### Centripetal Force

To give an object moving in a circle the centripetal acceleration needed to keep moving, it needs a force applied to it. Any force that causes an object to move in a circle is a [more…]

### What Is Physical Work?

In physics, *physical work* is defined as the applied force multiplied by the component of the displacement that is in the same direction as the force. So if you’re pushing a refrigerator 2.0 m across the [more…]

### Dealing with the Net Force

There’s often more than one force involved when you’re dragging a mass over a distance. Just think of the forces of friction and gravity for an object on an inclined plane. For example, take a look at [more…]