1. General Physics

Question 1

In a velocity-time graph, how is the acceleration represented?

Answer 1

The gradient is equal to the acceleration

Question 2

What is the equation for SPEED?

Answer 2

Speed = Distance Moved / Time Taken

Question 3

In a distance-time graph, how is the speed represented?

Answer 3

The gradient is equal to the speed

Question 4

In a distance-time graph, what does a curve mean?

Answer 4

Curves represent acceleration or deceleration

Question 5

What is the equation for ACCELERATION?

Answer 5

Acceleration = Change in Velocity / Time Taken

Question 6

In a velocity-time graph, how is the distance travelled in a certain period of time represented?

Answer 6

The area under any section of the graph is equal to the distance travelled in that time interval

Question 7

What is the equation for FORCE?

Answer 7

Force = Mass x Acceleration

Question 8

What is the equation for WEIGHT?

Answer 8

Weight = Mass x Gravitational Field

Question 9

What are the five main types of forces?

Answer 9

1. Gravity or Weight (straight downwards)
2. Reaction Force (straight upwards)
3. Electrostatic Force (between two charged objects)
4. Thrust (speed something up)
5. Drag or Air Resistance (slowing things down)

Question 10

Where does the weight of a body act through?

Answer 10

Its centre of gravity

Question 11

What is friction?

Answer 11

Friction is a force that opposes motion

Question 12

Describe an experiment to investigate the motion of a toy car

Answer 12

Set up two light gates. Measure the distance of the two light gates. Allow the car to travel between the two light gates and work out its speed

Question 13

What are the two forces acting on falling objects?

Answer 13

Drag and Weight

Question 14

Why do falling objects reach a terminal velocity?

Answer 14

When objects first set off, they have much more force accelerating them than resistance slowing them down. As the velocity increases, the resistance builds up.

This gradually reduces the acceleration until eventually the resistance force is equal to the accelerating force and then it won’t be able to accelerate any more

Question 15

Describe an experiment using sycamore seeds to investigate the forces acting on a falling object

Answer 15

Time the time taken for a sycamore seed to hit the ground from an assigned height.

You will find out that the longer the wings are, the longer the time taken for it to hit the ground

Question 16

What is Newton’s Third law?

Answer 16

Newton’s third law states that when two bodies interact, they apply forces to one another that are equal in magnitude and opposite in direction.

Question 17

What is a Vector quantity?

Answer 17

Vector quantities refer to the physical quantities characterized by the presence of both MAGNITUDE and DIRECTION.

Question 18

What is a Scalalar quantity?

Answer 18

Scalar quantities have a size or magnitude only and need no other information to specify them.

Question 19

Is force a vector quantity or a scalar quantity?

Answer 19

VECTOR QUANTITY

Question 20

What is the equation for MOMENTUM?

Answer 20

momentum = mass x velocity

Question 21

What is the equation for MOMENT?

Answer 21

moment = force x perpendicular distance form the pivot

Question 22

What is gravitational field strength?

Answer 22

The field of force surrounding a body of finite mass in which another body would experience an attractive force that is proportional to the product of the masses and inversely proportional to the square of the distance between them.