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FORCES ASSESSMENT > PHYSICS1 > Flashcards

PHYSICS1 Flashcards

1
Q

Give four examples of elastic materials?

A

Rubber bands, rubber gloves, erasers and slinkies.

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2
Q

What is the definition of an elastic material?

A

Will return to the original shape and length if the force is taken away from them.

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3
Q

If we squeeze an elastic material (two forces) what will happen?

A

It will compress. (ELASTIC DEFORMATION.)

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4
Q

What happens if we apply three forces to an elastic material?

A

It will bend (ELASTIC DEFORMATION).

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5
Q

What does it mean if there is one force to a stationary object?

A

The forces are no longer balanced so it would not bend, it would just move.

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6
Q

What happens when we stretch an inelastic material?

A

It will not return back to it’s original shape.

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7
Q

Give one example of an inelastic material?

A

Certain polymers.

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8
Q

What is the equation for force?

A

Spring constant (n/m) X extension (m) WE CAN ALSO USE THIS TO CALCULATE COMPRESSION JUST REPLACE EXTENSION WITH COMPRESSION.

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9
Q

Work done=

A

Elastic potential energy- only if it is not inelastically deformed.

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10
Q

What is the limit of proportionality?

A

The object does not return to its original length when the force is removed. Hooke’s law no longer applicable.

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11
Q

What is the acceleration equation of the object is at a constant rate?

A

Velocity squared (m/s) -initial velocity squared (m/s)= 2 X acceleration (m/s squared) x distance (m)/

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12
Q

What is the gravitational field strength of the earth?

A

9.8 m/s squared.

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13
Q

What is meant by newtons second law?

A

The acceleration of an object is proportional to the resultant force acting on the object and is inversely proportional to the mass of an object. THE GREATER FORCE= GREATER ACCELLERATION.

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14
Q

What is the equation for force?

A

Force (n)= mass (kg) x acceleration (m/s squared)

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15
Q

What is the average speed of a car on the motorway?

A

30m/s

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16
Q

What is the average speed of a car on the main road?

A

13m/s

17
Q

What is the average speed increase needed to go from a main road to a motorway?

A

2m/s squared (2000N)

18
Q

What is meant by intertia?

A

Objects will stay still or keep the same motion unless you apply a resultant force.

19
Q

What is meant by the inertial mass?

A

A measure of how difficult it is to change the velocity of an object.

20
Q

What is meant by the stopping distance?

A

The total distance travelled from when the driver first spots the obstruction to when it stops. THIS INCLUDED THINKING AND BREAKING DISTANCE.

21
Q

What is meant by the thinking distance?

A

The distance travelled by the car during the drivers reaction time.

22
Q

What is included within the thinking distance?

A

Spotting the obstruction, making a decision and putting foot to the break.

23
Q

What is meant by the breaking distance?

A

The distance the car travels from when the driver applies the breaks to when the car stops.

24
Q

GREATER SPEED=

A

GREATER STOPPING DISTANCE.

25
Q

How to we generally test reaction time?

A

The ruler drop test.

26
Q

What can affect reaction time?

A

Being tired, substance intake, alcohol, distraction such as a mobile phone.

27
Q

What can affect breaking distance?

A

Ice (as it reduces friction), and worn tires for the same reason.

28
Q

Explain in detail how to carry out the acceleration and mass practical. (12 POINTS)

A
  • Attach a piece of string to a toy car
  • Make sure the string is looped around the pulley.
  • At the other end of the string there should be a 100g mass.
  • The weight of the mass will provide the force acting on the car.
  • Get a timer.
  • On desk draw chalk lines at equal intervals such as 10cm.
  • Hold car at starting point and let go.
  • because a resultant force is acting through string car will accelerate.
  • Record the time the car passes through each interval.
  • Record experiment on phone to get accurate timings.
  • Repeat the experiment with a decreasing mass (80,60,40,20).
  • Any mass we take from the car must be put on the car because overall mass of the object needs to stay the same.
29
Q

What can cause a driver to loose control of their vehicle? (6 POINTS)

A
  • Kinetic energy depends on velocity squared so if we double the velocity, kinetic energy quadruples.
  • When a car is breaking, the break presses against the wheel.
  • There is friction between the break and the wheel.
  • Kinetic energy is converted to thermal in the brakes, so the temperature of the breaks increase and the car slows down because it looses kinetic energy.
  • THE GREATER SPEED–> THE GREATER BREAKING FORCE. (you are decelerating rapidly).
  • This can cause the breaks to overheat which can leave the driver to loose control.

FORCES ASSESSMENT (1 decks)

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