1.3 Dynamics

Question 1

Newton’s 1^st Law

Answer 1

If the resultant force on an object is zero then the object will either remain stationary, or if it was already moving, then it will continue to move with uniform motion.

Question 2

Newton’s 2^nd Law

Answer 2

F = ma
The force in a direction is directly proportional to the mass multiplied by the acceleration in the direction

Question 3

Newton’s 3^rd Law

Answer 3

If body A exerts a force on body B, then body B exerts an equal but opposite force on body A

Question 4

What are the units for force

Answer 4

N, Newton’s

Question 5

What are the base SI units for N?

Answer 5

kgms^-2

Question 6

Weight

Answer 6

Is a measure of how large the force of gravity is on an object

Question 7

Mass

Answer 7

Is a measure of how much ‘matter’ or material an object has

Question 8

Momentum

Answer 8

Is the product of mass and velocity

Question 9

The principle of Conservation of Momentum

Answer 9

The total momentum of a system of interacting bodies will remain constant if there are no external forces acting upon the system

Question 10

What are the units for momentum?

Answer 10

kgms^-1

Question 11

In an elastic collision …

Answer 11

No kinetic energy is lost

Question 12

In an inelastic collision …

Answer 12

Some kinetic energy of the system is lost to the surroundings

Question 13

What is the opposite reaction to weight called?

Answer 13

Normal Reaction

Question 14

What is the gradient of a momentum-time graph equal to?

Answer 14

Force