Spec 5

Question 1

What is the difference between mass and weight?

Answer 1

Mass = measure of of how many particles are in an object.
Weight = combo of number of particles AND and how strong the gravitational field is around the object.

Question 2

What is a scalar force?

Answer 2

A force that you only measure the magnitude - moves up only.

E.g. height or distance

Question 3

What is a vector force?

Answer 3

A force that has both magnitude and direction - can go up and down.
E.g. displacement

Question 4

What is a centre of mass?

Answer 4

The average point of mass on an object, all mass acts from this point.
Tip - think of a target 🎯, the very middle would be the centre of mass.

Question 5

How do you find the centre of mass for an irregular object?

PRACTICAL.

Answer 5

~ Clamp stand with a pivot.
~ Pierce holes in the irregular piece of cardboard, place object on pivot through one of the holes
~ Use a ruler to draw a line directly down and directly across
~ Repeat from multiple holes
~ Intersection = centre of mass.

Question 6

What factors can an unbalanced force affect?

Answer 6

• Direction (collision) example = golf ball on a wall
• Speed example = engine in a car
• Shape (elasticity) example = water balloon throw

Question 7

What is the resultant force?

Answer 7

The resultant force is the total force in one direction.