Mass & Weight

Question 1

Mass

Answer 1

A measure of the amount of matter in a object (measured in kg)

Question 2

Effect of mass (1)

Answer 2

All objects are attracted to the earth. The greater the mass, the stronger the attraction (gravitational pull)

Question 3

Effect of mass (2)

Answer 3

All objects resist change in motion. The greater the mass the greater the resistance

Question 4

Weight definition

Answer 4

The gravitational force that acts on an object (measured in N)

Question 5

Gravity pulls on every object. How many newtons act on 1kg of matter

Answer 5

~10N

Question 6

Formula for Weight

Answer 6

Weight=Mass x Gravity

E.g. 109kg (109 x 10) W+1019N

Question 7

Demonstrate understanding that weight (and hence masses) may be compared using a balance

Answer 7

A beam balance Spring balance
-measures weight (not mass) -Measures weight

                                             Both graduated 
                                                 in Newtons

Question 8

Formula for a moment

Answer 8

Nm=Nxm

Moment= force x perpendicular distance from pivot

Question 9

Moment

Answer 9

Measure of the turning effect on a body

Question 10

What is a “plane lamina”

Answer 10

A piece of cardboard

Question 11

Plumb-line

Answer 11

A string with a weight

Question 12

How to find the center of mass of a plane lamina

Answer 12

> Hang card on a pin on a stand. Ensure it swings freely
Hang plumb-line in front of plane lamina. Use plumb-line to draw a vertical line down card
Repeat 2 times with pin in different places
The center of mass is where the lines intersect