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Flashcards in Science - Physics - Forces Deck (16):
0

What is a force?

A force is a push, pull or turn.

1

What unit is used to measure forces?

Newtons (N)

2

Describe a balanced force.

All forces on an object are equal if The object is at rest
or
All forces on an object remain constant if the object is moving.
A balanced force has no effect on an object.

3

What will be the effect of an unbalanced force on an object?

An unbalanced force will make an object
Speed up
Slow down
Or change direction.

4

What 2 elements do forces have?

A size
A direction

5

How do you find the resultant (overall) force on an object?

Add up all the forces acting on the object.
(Forward forces are a positive number and backward forces are a negative number).

6

What is the resultant force if forward and backward forces are balanced?

0

7

A moving object has a resultant of 0N. An unbalanced force in the same direction of the motion acts on the object. What is the effect?

The object speeds up.

8

A moving object has a resultant of 0N. An unbalanced force in the opposite direction of the motion acts on the object. What is the effect?

The object slows down.

9

Define 'support force/normal force/reaction force'. (Similes)

A force that is equal but opposite to the weight of an object. E.g. A table under a book.

10

What piece of equipment is used to measure forces?

A Newton Meter

11

What is friction?

Friction is a force that acts in the opposite direction to a moving object.

12

What is a vacuum? (Yeah, yeah, NOT the cleaner! Sigh)

An artificial environment in which the air resistance is removed.

13

Define mass.

Mass is a measurement of how much of something there is.

14

Define weight.

Weight measures force.

15

What is the formula for weight.

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