Mechanics: Force, Motion, Energy and Pressure

Question 1

The x axis on a speed/time graph is…

Answer 1

Distance (d)

Question 2

Time is measure in…

Answer 2

Seconds, s

Question 3

What is the formula for velocity, v?

Answer 3

v = Δd / Δ t

Question 4

Acceleration is measure in what?

Answer 4

ms^-2

Question 5

Velocity is measured in…

Answer 5

ms^-1

Question 6

The gradient of a distance/time graph is…

Answer 6

Speed (v)

Question 7

Gradient is calculated on a graph by…

Answer 7

Rise / run

Question 8

What is another word that means negative acceleration?

Answer 8

Deceleration

Question 9

What does the gradient on a speed/time graph show?

Answer 9

Acceleration

Question 10

What are forces measured in?

Answer 10

Newtons, N

Question 11

What do we know about the forces on an object moving at a constant speed?

Answer 11

They are balanced

Question 12

If an object is accelerating the forces on that object must be what?

Answer 12

Unbalanced

Question 13

What units are used to measure mass?

Answer 13

Kilograms, kg

Question 14

What do we call the force acting downward on an object?

Answer 14

Weight or weight force

Question 15

What is the name given to the force that keeps a boat afloat?

Answer 15

Upthrust

Question 16

Which force slows objects down?

Answer 16

Friction force

Question 17

What is the name of the force which moves an object forward?

Answer 17

Thrust

Question 18

What is Gravity on Earth equal to?

Answer 18

10 ms^-2

Question 19

What is Work measured in?

Answer 19

Joules, J

Question 20

Define Work

Answer 20

Done when a force moves or changes the movement of an object.

Question 21

What is the formula to calculate Work?

Answer 21

Force x distance, Fd

Question 22

Define Energy

Answer 22

The capacity to do work

Question 23

What form of energy do a moving object have?

Answer 23

Kinetic

Question 24

What is the energy gained by an object as it is lifted?

Answer 24

Gravitational Potential

Question 25

What is the E_K (Kinetic energy) of an object just before it hits the ground equal to?

Answer 25

The Gravitational Potential it started with, E_P

Question 26

What is the formula to calculate E_K(Kinetic energy)?

Answer 26

½mv²

Question 27

What is the formula to calculate the change in E_P (Gravitational Potential)?

Answer 27

m g Δh

Question 28

What happens to Kinetic energy if the speed doubles

Answer 28

It increase by 4 times

Question 29

What happens to stopping distances as speed increases?

Answer 29

It increases

Question 30

Complete this statement “Energy is never lost or gained it is only...”

Answer 30

Transferred /transformed

Question 31

What is the unit of Power?

Answer 31

Watt, W or Js^-1

Question 32

What is the formula for Power?

Answer 32

W/t

Question 33

What happens to pressure if the force remains the same but the area increases?

Answer 33

The pressure decreases

Question 34

What happens to pressure if the force remains the same but the area decreases?

Answer 34

The pressure increases

Question 35

What happens to pressure if the force increases but the area remains the same?

Answer 35

The pressure increases

Question 36

What happens to pressure if the force decreases but the area remains the same?

Answer 36

The pressure decreases

Question 37

How do snow shoes and skis keep the wearer on top of the snow?

Answer 37

The force is spread over a larger/greater area

Question 38

How would you describe the pressure at the point of a needles as it is forced through fabric? Why?

Answer 38

Enormous/great/large. The area of the point is very small so the force creates greater pressure.

Question 39

Why is it easy to pull Drawing pins into a surface?

Answer 39

The area of point is very small so the pressure on that point is greater.

Question 40

Why do camels have such large feet (something to do with Pressure 😉)?

Answer 40

Greater surface area spreads the force making the pressure less so they don’t sink into the sand.

Question 41

Define Pressure

Answer 41

The amount of force an object exerts over and area.

Question 42

What is the point at which the weight force down equals the air resistance force up?

Answer 42

Terminal velocity.

Question 43

What is a Pascal, Pa?

Answer 43

1 Nm^-2

Question 44

What does a horizontal line on a distance/time graph tell us about the object?

Answer 44

It is stationary/stopped

Question 45

What does an upward curve on a distance/time graph tell us about the object?

Answer 45

It is accelerating.

Question 46

What is happening to an object when the curve on a distance/time graph begins to flatten?

Answer 46

It is decelerating

Question 47

What does a horizontal line mean on a speed/time graph?

Answer 47

The object is traveling at a constant speed.