Physics mid topic yr 10

Question 1

Define motion

Answer 1

Motion is the change in an objects position with time

Question 1

Define average speed

Answer 1

average speed is the total distance covered divided by the total time taken

Question 2

Define instantaneous speed

Answer 2

instantaneous speed is the speed at an instant point of the journey.

Question 3

Define a scalar quantity with some examples

Answer 3

A scalar quantity are physical quantities that only have magnitude but no direction. This includes energy, mass, temperature and pressure.

Question 4

Define a vector quantity with some examples

Answer 4

A Vector quantity are physical quantities that have both direction and magnitude. This includes displacement, direction, velocity, drag and momentum.

Question 5

Define inertia

Answer 5

Define inertia as an object’s resistance to a change in its motion, an object with a greater mass will have greater inertia

Question 6

Define displacement

Answer 6

Displacement refers to the shortest distance travelled by an object from its initial to its final position.

Question 7

Define average velocity

Answer 7

average velocity is the total displacement divided by the total time taken

Question 8

Define instantaneous velocity

Answer 8

instantaneous velocity is the displacement at an instant point of the journey.

Question 9

Define acceleration

Answer 9

Define acceleration as a change in velocity with time (or rate of change of velocity).

Question 10

What is a force

Answer 10

a force is a push or a pull that changes an object’s motion or its shape

Question 11

Describe net force

Answer 11

Describe net force as the sum of the forces acting on an object

Question 12

Define the first law of motion

Answer 12

Newton’s first law of motions states that an object will stay in motion unless an external force acts upon it.

Question 13

Define the second law of motion

Answer 13

Newton’s second law of motion states that “The acceleration of an object is directly related to the magnitude and direction of the force acting on the object, and inversely related to the mass of the object: F=MA.”(Mass if direclty proportional to its acceleration while inversely proportional to its mass) This means heavy object (with a lot of mass) needs a great force to start moving than a lighter object.

Question 14

Define weight

Answer 14

Weight is a measure of the gravitational force acting on an object. It is measured in N (newtons), Fweight=mg

Question 14

Define the third law of motion

Answer 14

The third law of motion states that every action has a equal and opposite reaction.

Question 15

Define energy

Answer 15

Energy is the ability to do work

Question 16

Define work

Answer 16

Measure of the amount of energy required to move an object
Define work also as a force applied over a distance

Question 17

Define the law of conservation of energy

Answer 17

The law of conservation states that energy cannot be created or destroyed.