Mechanics

Question 1

What is rectilinear motion

Answer 1

Motion along a straight path

Question 2

What is Instantaneous velocity

Answer 2

The velocity at an instant

Question 3

What is formula for average velocity

Answer 3

average velocity=displacement/time

Question 4

What is the formula for acceleration

Answer 4

acceleration=change in velocity/time

Question 5

What does SUVAT stand for

Answer 5

S=displacement
U=initial velocity
V=final velocity
A=acceleration
T=time

Question 6

What is the 1st SUVAT equation

Answer 6

V=u+at

Question 7

What is the 2nd SUVAT equation

Answer 7

s=(u+v)t/2

Question 8

What is the 3rd suvat equation

Answer 8

s=ut+1/2*at^squared

Question 9

What is the 4th SUVAT equation

Answer 9

v^squared-u^squared=2as

Question 10

What is Free fall

Answer 10

In the absence of air resistance, all objects will fall freely with the same acceleration

Question 11

If an object is thrown upwards it will be accelerating downwards at___

Answer 11

9.8ms^-1

Question 12

Objects projected horizontally will___

Answer 12

still fall freely with a vertical downward acceleration of 9.8ms^-1

Question 13

In the vertical plane the object will accerlate__

Answer 13

down at 9.8ms^-1 and the horizontal velocity remains constant

Question 14

What is the formula for horizontal displacement

Answer 14

Horizontal displacement=constant horizontal velocity * time

Question 15

What is the formula for initial velocity in the vertical component

Answer 15

initial velocity(vertical component)=u*sinθ

Question 16

What is the formula for initial velocity in the horizontal component

Answer 16

initial velocity(horizontal component)=u*cosθ

Question 17

For objects projected at an angle to the horizontal the___

Answer 17

vertical and horizontal motion should be treated separately by using vertical and horizontal components

Question 18

For a displacement time graph the gradient is the__

Answer 18

velocity

Question 19

What is the formula for instantaneous velocity

Answer 19

instantaneous velocity=Δs/Δt

Question 20

For a velocity time graph the gradient is the__

Answer 20

acceleration

Question 21

what is the formula for displacement at constant velocity

Answer 21

displacement(constant velocity)= velocity * time

Question 22

What is the formula for displacement for an accelerating object

Answer 22

displacement(accelerating object)=base*height/2

Question 23

What is the formula for displacement for any velocity time graph

Answer 23

displacement(for any velocity time graph)= area

Question 24

What is Linear momentum

Answer 24

The product of a body’s mass and velocity

Question 25

What is the formula for momentum

Answer 25

momentum=mass*velocity

Question 26

What is the conservation of momentum

Answer 26

The total momentum before event=The total momentum after event

Question 27

What is the formula for conservation of momentum

Answer 27

Mau=(Ma+Mb)*V

Question 28

What is the formula for impulse force

Answer 28

Impulse force=change in momentum

Question 28

What is the formula for the resultant

Answer 28

resultant=change in momentum/time interval

Question 29

What is Recoil

Answer 29

When two objects are pushing one another apart

Question 30

The area under a force-time graph for collisions represents

Answer 30

the change in momentum

Question 31

The resultant force exerted on a body is__

Answer 31

directly proportional to the rate of change of linear momentum

Question 32

Momentum can have a___

Answer 32

negative value if the object is travelling in the opposite direction

Question 33

What is gravitational field strength

Answer 33

The force per unit mass on an object placed in a gravitational field

Question 34

What is the formula for gravitational field strength

Answer 34

gravitational field strength=force/mass

Question 35

What is the formula for weight

Answer 35

weight=mass*gravitational field strength

Question 36

What is tension

Answer 36

When objects are subjected to a stretching force, the molecular forces try to restore the object to its original length

Question 37

What is Newton's 1st law of motion

Answer 37

An object will remain in a state of rest or continue to move with a constant velocity unless acted upon by a resultant external force

Question 38

A body is in equilibrium if___

Answer 38

when acted on by a number of forces, the resultant force is zero

Question 39

What is center of gravity

Answer 39

The point at which the weight of the object can be said to act

Question 40

What is the formula for resultant force for a fixed mass

Answer 40

resultant force=mass*acceleration

Question 41

What is Newton's 2nd law

Answer 41

The acceleration of a body of constant mass is proportional to the resultant force applied to it

Question 42

What is Newton's 3rd law

Answer 42

If body A exerts a force on body B, body B will exert an equal and opposite force on body A

Question 43

What is a moment

Answer 43

The turning effect of a force

Question 44

What is the formula for moments

Answer 44

moment=force*perpendicular distance

Question 45

What is the principle of moments

Answer 45

If a system is in equilibrium, the sum of the clockwise moments must equal the sum of the anticlockwise moments

Question 46

What is a couple

Answer 46

The resultant moment of a pair of equal forces in opposite directions

Question 47

What is the formula for a couple

Answer 47

couple=magnitude of each force*perpendicular separation of their lines of motion

Question 48

What is torque

Answer 48

The turning effect due to two or more forces

Question 49

What is work

Answer 49

When the point of application of a force is moved in the direction of the force

Question 50

What are the 3 formulas for work done

Answer 50

work done=force*distance work done=horizontal component*horizontal displacement work done=average force*displacement

Question 51

What is Energy

Answer 51

The ability to do work

Question 52

Energy is transferred to an object when___

Answer 52

Work is done on it

Question 53

When does an object have energy

Answer 53

When it has the ability to do work

Question 54

What is potential energy

Answer 54

The ability of an object to do work by virtue of its position or state

Question 55

What is formula for GPE

Answer 55

Egrav=mass*gravitational field strength*height

Question 56

What is gravitational potential energy

Answer 56

The energy an object possesses by virtue of its position in a gravitational field

Question 57

What is Elastic potential energy

Answer 57

The ability of an object to do work by virtue of a change in its shape

Question 58

What is formula for Elastic potential energy

Answer 58

EPE=average force*extension

Question 59

What is Kinetic energy

Answer 59

The ability of an object to do work by virtue of its motion

Question 60

What is the formula for kinetic energy

Answer 60

KE=1/2*mass*(velocity)^squared

Question 61

What is the formula for Kinetic energy if a mass changes speed

Answer 61

ΔKE=1/2*mass*(final velocity)^squared - 1/2*mass*(initial velocity)^squared

Question 62

What is internal energy

Answer 62

The sum of the KE and potential energy in a system

Question 63

What is chemical energy

Answer 63

The ability to do work using chemical reactions

Question 64

What is nuclear energy

Answer 64

The ability to do work by changes in the constitution of nuclei

Question 65

What is Electrostatic potential energy

Answer 65

The energy of a charged particle by virtue of its position in an electrical field

Question 66

What is Radiant energy

Answer 66

Energy transferred by electromagnetic waves

Question 67

What is the principle of conservation of energy

Answer 67

Energy cannot be created or destroyed

Question 68

What is the formula for efficiency

Answer 68

Efficiency=(Useful power output/energy power input)*100

Question 69

What is efficiency

Answer 69

The ability to transfer the input energy to useful energy

Question 70

What are the formulas for power

Answer 70

power=Energy transferred/time power=force * velocity