P5 Revision (not EOY)

Question 1

What is a scalar quantity?

Answer 1

A quantity that only has magnitude- is NOT direction dependent

Question 2

What is a vector quantity ?

Answer 2

A quantity that has both a magnitude and an associated direction

Question 3

What is a force

Answer 3

A push or pull acting on an object due to an interaction with another object

Question 4

What are the two categories that all forces can be split into?

Answer 4

Contact forces
Non-contact forces

Question 5

Examples of contact
Forced

Answer 5

1) friction
2) air resistance
3) tension

Question 6

Examples of non-contact forces

Answer 6

Magnetic forces
Electrostatic forces
Gravitational forces

Question 7

Examples of vector quantities

Answer 7

Velocity
Displacement
Force

Question 8

Examples of scalar quantities

Answer 8

Temperature
Time
Mass
Speed

Question 9

What is weight

Answer 9

The force that acts on an object due to gravity and the object’s mass

Question 10

Equation for weight

Answer 10

Weight(n) = mass(kg) x gravitational field strength (n/kg)

Question 11

What is the object’s centre of mass

Answer 11

The single point where an object’s weight can be considered to act through

Question 12

Equipment used to measure an object’s weight is a …

Answer 12

Newton-meter

Question 13

What is the equation for work done?

Answer 13

Work done(j) = force(n) x distance(m)

Question 14

What occurs when work is done against frictional forces

Answer 14

A rise in temperature of the object

Kinetic energy is converted to heat

Question 15

Explain the relationship between the force applied and the extension of an elastic object

Answer 15

The extension is directly proportional to the force applied, provided that the limit of proportionality is not exceeded

Question 16

What is inelastic deformation

Answer 16

Results in the object being permanently stretched
Object doesn’t return to original shape when force is removed

Question 17

What is the equation linking force, spring constant and extension - Hooke’s law.

Answer 17

Force(n) = spring constant (n/m) x extension (m)

Question 18

What can extension be replaced with in the equation for spring force

Answer 18

Compression

Question 19

State Newton’s first law for a stationary object

Answer 19

If the resultant force on a stationary object is zero, the object will remain at rest

Question 20

State Newton’s first law for a moving object

Answer 20

If the resultant force on a moving object is zero, the object will remain at a constant velocity

Question 21

What is the limit of proportionality?

Answer 21

The point beyond which extension of an elastic object is no longer directly proportional to the force applied to it.

Question 22

What is another equation for work done (elasticity)

Answer 22

Work done = 1/2 x spring constant x extension ^2