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# Physics

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Cards in this guide (27)
If a bicycle has a mass of 10 kg and a velocity of 11 ms what is the magnitude of its momentum

Momentum = Mass x Velocity = 11 x 10 = 110 Ns (Newton seconds)

Which of the following best represents an isolated system

outer space

What does an inclined plane do to the force to make work easier by also increasing the distance

An inclined plane increases the force and makes work easier.

According to the law of conservation of in an isolated system the initial total momentum before a collision equals the final total momentum

momentum

Which of the following is equal to an impulse of 9 units

Apex:

Force = 2, time = 4.5.

Properties of matter are typically broken into two categories physical and

chemical

Which form of energy is due to the movement of electrons

ELECTRICAL

What is the theorem that says that impulse equals change in momentum

Impulse-momentum theorem

Which of the following expressions are correct for impulse

F the triangle thingy and t

the triangle thingy then p

It takes 300 N to move a box 10 meters in 10 seconds How much power is required

300 W

Everything in or on water pushes some water aside even if it's just a little bit What is this called

This is called "displacement", as the weight of water that moves is equal to the weight of the object on the water. Heavier objects displace more water. If the total weight of the object is greater than the water displaced by its volume, it is denser than water, and sinks.

A soccer player sprinting down the field demonstrates which form of energy

kinetic

What the the two main states of mechanical energy

Potential energy and Kinetic energy

Items involve a wedge

There are many items in everyday life that involve a wedge. A spatula for cooking is a wedge, a door stopper is a wedge used to stop the door, and a knife use to chop vegetables is a wedge.

Spaceship 1 and Spaceship 2 have equal masses of 300 kg Spaceship 1 has a speed of 0 ms and Spaceship 2 has a speed of 6 ms What is the magnitude of their combinied momentum

1,800 <3

Is momentum a vector quantity because it includes velocity which is also a vector quantity

yes, momentum is a vector quantity.

Give two examples of class 2 levers

Wheel barrows and bottle openers are two examples of class 2 levers.

Spaceship 1 and Spaceship 2 have equal masses of 200 kg They collide Spaceship 1's final speed is 2 ms and Spaceship 2's final speed is 1 ms in the same direction What is their combined momentum

2,000 kg-m/s "Apex"

Spaceship 1 and Spaceship 2 have equal masses of 150 kg Spaceship 1 has an initial momentum magnitude of 900 kg-ms What is its initial speed

6m/s

How do potential and kinetic energy relate to mechanical energy

Potential Energy + Kinetic Energy = Mechanical Energy

If the output force is greater than the input force of a simple machine Is the mechanical advantage greater than one

The mechanical advantage (MA) of a machine is output/input.

If you have a input of 10kg and a output of 40kg then the MA is 40/10 or 4.

If you have a input of 40kg and a output of 10kg then the MA is 10/40 or 0.25.

If the output force is greater than the input force of a simple machine the mechanical advantage is greater than one. If the output force is less than the input force, the mechanical advantage is less than one.

In situations is mechanical energy conserved

It depends on the situation

How much work must be done on a 5 kg snowboard to increase its speed from 2 ms to 4 ms

work=mass*speed,5*2=10

A spaceship has a momentum of 45000 kg m s to the right and a mass of 200 kg What is the magnitude of its velocity

momentum=mass X velocity

45000 = 200 X velocity

so, velocity = 45000/200

= 225 m/s

In a collision a vehicle that rebounds off the object it trikes experiences less force than if it crumples assuming the time is the same in both situations

false

Spaceship 1 and spaceship 2 have equal masses of 300kg spaceship 1s has a speed is 0 ms and spaceship 2 has a speed of 4 ms. they collide and stick together. what is their speed

2 m/s

Which of the following items does not use a wheel and axle (Apex)

a bicycle

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