P10

Question 1

What is the equation for resultant force?

Answer 1

Resultant force= Mass x acceleration

Question 2

What is newtons second law?

Answer 2

The acceleration of an object is:

• Proportianal to the resultant force on the object.
• Inversely proportional to the mass of the object.

Question 3

What is inertia?

Answer 3

Tendacy of an object to stay at rest or to continue in uniform motion.

Question 4

What is the weight of an object?

Answer 4

The force acting on it due to gravity.

Question 5

What is mass?

Answer 5

Depends on the quantity of matter in it.

Question 6

What is the equation for weight?

Answer 6

Weight= Mass x gravitational field strength

Question 7

What is gravitational field strength measured in?

Answer 7

N/kg

Question 8

When an object is fmoving at terminal velocity what is the resultant force on it?

Answer 8

0

Question 9

What is thinking distance?

Answer 9

The distance travelled by the vehicle in the time it takes the driver to react.

Question 10

What is braking distance?

Answer 10

The distance travelled by the vehicle during the time the braking force acts.

Question 11

What is the equation to find out force? (gives the braking force of a vehicle)

Answer 11

Force= Mass x Acceleration

Question 12

How do you find out the stopping distance?

Answer 12

Stopping distance= Thinking distance + braking distance

Question 13

What is the equation of the momentum of a moving object?

Answer 13

momentum of a moving object= Mass x Velocity

Question 14

What is the law of conservation of momentum?

Answer 14

In a closed system, the total momentum before and event is eaual to the total momentum after the event.

Question 15

What is the equation for acceleration?

Answer 15

Acceleration= (final velocity - initial velocity)/divided by/ time taken

Question 16

What is the equation of force?

Answer 16

Force= (mass x change of velocity)/divided by/ time taken

Question 17

What do crumple zones and side bars do?

Answer 17

They increase the impact time and this then reduces the imact force on the car.

Question 18

What is hooke’s law?

Answer 18

The extension of a spring is directly proportional to the force applied, as long as it’s limit of proportionality is not exceeded.

Question 19

What is the equation of force applied?

Answer 19

Force applied= spring constant x extension

Question 20

What makes an object elastic p?

Answer 20

If it returns to it’s original shape when the forces deforming it are removed.

Question 21

Directly proportional?

Answer 21

A graph will show this if the line of best fit is a straight line through the origin.

Question 21

Elastic?

Answer 21

A material is elastic if it is able to regain it’s shape after it has been squashed or stretched.

Question 22

Extension?

Answer 22

The increase in length of a spring from it’s original length.

Question 23

Gravitational field strength?

Answer 23

The force of gravity on an object of mass 1kg. It is also the acceleration of free fall.

Question 24

Limit of proportionality?

Answer 24

The limit for hooke’s law applied to the extension of a streched spring.

Question 25

Mass?

Answer 25

The quantity of matter in an object – a measure of the difficulty of changing the motion of an object (in kilograms, kg).

Question 26

Momentum?

Answer 26

Mass x velocity.

Question 27

Newton’s second law of motion?

Answer 27

The acceleration of an object is proportional to the resultant force on the object, and inversely proportional to the mass of the object.

Question 28

Stopping distance?

Answer 28

The distance travelled by the vehicle in the time it takes for the driver to think and brake.

Question 29

Terminal velocity?

Answer 29

The velocity reached by an object when the drag force on it is equal and opposite to the force making it move.

Question 30

Weight?

Answer 30

The force of gravity on an object ( in newtons).