Friction Investigation Results The frictional forces act in the opposite direction to movement making it harder to move, therefore making the car slower and pick up less speed moving down the ramp so travelling less distance.

Static friction is the friction that is much more powerful than sliding friction and makes it hard to budge an object that isn’t moving, like a heavy box on the floor. Kinetic friction occurs when two objects are moving relative to each other and rub together.

Friction is the force that resists motion – it slows down or altogether stops motion. Friction happens when two solid materials rub together, but it also happens when different forms of matter move past each other (e.g., a solid moving through a fluid such as air or water creates air resistance or water resistance).

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Since the sliding object has no angular velocity, its linear velocity is greater than that of the rolling object, and it reaches the bottom of the track faster.

When objects slide down a slope, the downward force acting on them to produce acceleration is (mg [email protected] – friction) and = ma. So acceleration, a = g [email protected] – friction/mass. The heavier object will have a higher acceleration and so arrive faster.

Air exert more force on a lighter object than the lighter object. They pull a similar weight of object to each other. The lighter person will experience little gravity when it’s released from up to down. With the presence of air and gravity, a heavier person will go down the slide faster than the lighter person.

So no, a heavier object (including a sled) does not accelerate faster due to gravity than a lighter one does. Friction is a normal force due to an object’s weight, so this friction force is (mostly) proportional to an object’s mass.

You should find that a solid object will always roll down the ramp faster than a hollow object of the same shape (sphere or cylinder)—regardless of their exact mass or diameter. This might come as a surprising or counterintuitive result!

For both interpretations, the answer is ‘yes’ since force still acts in an opposite force on anything which has mass. As you accelerate, your velocity increases and therefore mass will increase. The increase in mass will bring about an opposite force. The greater the mass, the greater the inertia.

The change in speed on slopes is due to gravity. When going downhill, objects will accelerate (go faster), and when going uphill they will decelerate (slow down). On a flat surface, assuming that there is little friction, they will then maintain a constant speed.

Objects of equal mass and radius but different shape or solid/hollow will roll down the incline at different rates. Solid sphere is faster than solid cylinder since sphere has lower moment of inertia, higher translational kinetic energy.

The hollow sphere will accelerate slower than the solid one (due to their different moments of inertia).

Just as linear momentum is conserved when there is no net external forces, angular momentum is constant or conserved when the net torque is zero. If the change in angular momentum ΔL is zero, then the angular momentum is constant; therefore, →L=constant L → = constant (when net τ=0).

Scientists at Purdue University created the object, which revolves at 300 billion revolutions per minute. Or, put another way, half a million times faster than a dentist’s drill.

PSR J1748−2446ad is the fastest-spinning pulsar known, at 716 Hz, or 716 times per second.

Scientists at Purdue University have made the fastest spinning object ever, a tiny ball of silicon dioxide that rotates 300 billion times per second. They positioned the microscopic silica balls in a vacuum and blasted them with two different lasers that induce the spin.

Washington: Runaway planets zipping through space at mind-numbing speeds of 30 million miles per hour are now the fastest objects in the universe, says a study.

Three-toed sloths are some of the slowest and seemingly laziest creatures in the world.

Most of us already know that darkness is the absence of light, and that light travels at the fastest speed possible for a physical object. In this respect, darkness has the same speed as light.

Shadows. In principle, shadows can move faster than the speed of light. When a shadow is bigger than the object casting it, it moves at a greater distance but in the same amount of time. If the shadow is large enough, it could move across the surface faster than light.

The simple answer is, “Yes, it is possible to stop time. All you need to do is travel at light speed.” Special Relativity pertains specifically to light. The fundamental tenet is that light speed is constant in all inertial reference frames, hence the denotation of “c” in reference to light.

Now coming to the point,darkness looks black in color because it’s frequency is capable of absorbing all colors of light and hence black. Unlike white it doesn’t reflect other colors. Darkness is absence of any color.

But if something can travel faster than light, it can travel backward in time, according to the theory. In this case, an “effect” could travel back to a point before its “cause” had occurred — for instance, a baby swinging before he gets a push.

Wormholes are shortcuts in spacetime, popular with science fiction authors and movie directors. They’ve never been seen, but according to Einstein’s general theory of relativity, they might exist.

While the debate continues over whether travelling into the past is possible, physicists have determined that travelling to the future most certainly is. And you don’t need a wormhole or a DeLorean to do it. Real-life time travel occurs through time dilation, a property of Einstein’s special relativity.