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Year 7 > Forces, Motion and Pressure ETT > Flashcards

Forces, Motion and Pressure ETT Flashcards

1
Q

What two things does a force arrow show?

A
  1. The length of the arrow shows the size of the force.
  2. The direction of the arrow shows the direction of the force.
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2
Q

Give some examples of non-contact forces

A
  • Gravitational force
  • Electrostatic force
  • Magnetic force
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3
Q

Give some examples of contact forces

A
  • Friction
  • Air resistance
  • Tension
  • Normal contact force
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4
Q

What are the units for:

a) gravitational field strength
b) weight
c) mass

A

a) N/kg
b) N
c) kg

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5
Q

What equation links weight, mass and gravitational field strength?

A

Weight = mass x gravitational field strength

W = m g

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6
Q

What type of energy is stored in a spring that is stretched or compressed?

A

Elastic potential energy

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7
Q

What happens to the temperature of an object experiencing friction?

A

Temperature increases

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8
Q

What is the name of an object that:

a) will return to its original shape after being deformed
b) will not return to its original shape after being deformed

A

a) elastic
b) inelastic

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9
Q

What is the relationship between force and extension of an elastic object?

A

Directly proportional

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10
Q

What happens to air resistance as speed increases?

A

As speed increases, air resistance increases.

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11
Q

What are typical speed values for someone walking, running and cycling (m/s)?

A
  • Walking 1.5 m/s
  • Running 3 m/s
  • Cycling 6 m/s
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12
Q

What is the speed of sound?

A

340 m/s

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13
Q

How many forces need to to be applied to this spring to stretch or compress it?

A

Two forces (e.g. one at either end)

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14
Q

What equation links distance travelled, speed and time?

A

Distance travelled = speed x time

s = v t

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15
Q

When oil or grease is used to reduce friction, what is this called?

A

Lubrication

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16
Q

Describe the motion in the following distance-time graph at point (a).

A

a) constant speed

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17
Q

Describe the motion of a moving car experiencing balanced forces.

A

Keep moving at a constant speed

18
Q

Describe the motion of a moving car experiencing unbalanced forces.

A

The car will change speed (either accelerate or decelerate)

19
Q

Describe the motion of a stationary car experiencing balanced forces.

A

The car will remain stationary.

20
Q

Describe the motion of a stationary car experiencing unbalanced forces.

A

The car will accelerate.

21
Q

What are typical everyday speeds for cars, trains and planes?

A
  • Car 25 m/s
  • Train 55 m/s
  • Plane 250 m/s
22
Q

If your mass on Earth is 50 kg, what would be your mass on the moon?

A

The same, 50 kg.

Your mass does not change.

23
Q

Name the equipment used to measure forces

A

Newtonmeter

24
Q

Name the forces acting on the book.

A

Weight (downwards)
Normal contact force (upwards)

25
Q

Describe the experiment to investigate how force affects the extension of the spring.

A
  • Measure the starting length of the spring using the ruler.
  • Add one 10 g mass, measure the extension of the spring using the ruler.
  • Repeat 5 times, each time adding one 10 g mass and measuring the extension of the spring.
26
Q

What equation links force, distance and moment of a force?

A

Moment of a force = force x distance

27
Q

What is a moment?

A

A turning effect of a force

28
Q

What are the SI units for:

a) moment
b) force
c) distance

A

a) newton-metres, Nm
b) newtons, N
c) metres, m

29
Q

If an object is balanced, what is true about the size of the clockwise and anti-clockwise moments?

A

They are equal in size.

30
Q

What equation links pressure, force and area?

A
31
Q

What two things does pressure in a liquid depend on?

A
  • Depth
  • Density of the liquid
32
Q

What are the SI units for:

a) Pressure
b) Force
c) Area

A

a) Pressure is measured in pascals (Pa)
b) Force is measured in newtons (N)
c) Area is measured in metres squared (m2)

33
Q

Describe and explain the relationship between the depth of a liquid and pressure.

A
  • As depth increases, pressure increases.
  • Because, as depth increases, the number of particles above increases.
  • Pressure increases because of the increased weight of particles above.
34
Q

Describe the motion in the following distance-time graph at point (b).

A

b) stationary

35
Q

Describe the motion in the following distance-time graph at point (c).

A

c) accelerating

36
Q

Describe the motion in the following distance-time graph at points a, b, c and d.

A

d) decelerating

37
Q

In what direction does liquid pressure act?

A

All directions

38
Q

Name the force acting upwards on objects in water

A

upthrust

39
Q

When the weight of an object in water equals the upthrust on the object, what happens?

A

The object floats

40
Q

What two forces must be balanced for an object to float?

A

weight and upthrust

41
Q

What happens to liquid pressure as depth increases?

A

It increases

Year 7 (12 decks)

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