Physics Forces & Energy

Question 1

What is a force?

Answer 1

A push or a pull on an object caused by it interacting with another object.

Question 2

What is Newtons 1st Law?

Answer 2

If forces are balanced, the object travels at a constant speed

Question 3

Name some non-contact forces.

Answer 3

Gravitational, magnetic, electrostatic

Question 4

Name some contact forces.

Answer 4

Friction, tension, NCF, air resistance

Question 5

What is weight?

Answer 5

The force acting on an object due to gravity.

Question 6

True or false: Gravity is a force.

Answer 6

False

Question 7

What is the unit of weight?

Answer 7

Newtons (N)

Question 8

What is the equation for weight?

Answer 8

W = m x g
(Where g = gravitational field strength)

Question 9

What unit is gravitational field strength measured in?

Answer 9

N/kg

Question 10

What is the gravitational field strength of Earth? (2dp)

Answer 10

9.81N/kg

Question 11

What is Hooke’s Law?

Answer 11

The force exerted on a spring is directly proportional to the extension.

Question 12

What does directly proportional mean?

Answer 12

As one variable is doubled, so is the other (straight line on a graph through the origin)

Question 13

What is the equation for Hooke’s Law?

Answer 13

F = ke

Question 14

What does k mean?

Answer 14

Spring constant

Question 15

What unit is the spring constant measured in?

Answer 15

N/m

Question 16

What does ‘e’ mean?

Answer 16

Extension

Question 17

What is the limit of proportionality?

Answer 17

The point at which the force is not directly proportional to the extension, and is in the plastic region.

Question 18

What is the ‘plastic region’?

Answer 18

When a spring is past the limit of proportionality and loses elasticity. Once it’s plastic, it’s irreversible.