Forces in Action

Question 1

What is a force?

Answer 1

A force is a push, pull or twist applied to an object.

Question 2

What is weight?

Answer 2

Weight is due to the force of gravity acting on an object.

Question 3

What is mass?

Answer 3

Mass is the amount of matter in an object.

Question 4

What is weight measured in?

Answer 4

Newtons (N)

Question 5

What is mass measured in?

Answer 5

kilograms (kg)

Question 6

What are non- contact forces? Give examples.

Answer 6

Forces that do not touch the object they move, e.g. gravity, electrical and magnetic forces.

Question 7

What is friction, and what type of force is it?

Answer 7

Friction is the force which slows movement and it is a contact force.

Question 8

What is acceleration?

Answer 8

When an object increases speed/ gets quicker in its motion.

Question 9

What is pressure?

Answer 9

The amount of force applied to a given area.

Question 10

What is pressure measured in?

Answer 10

Pascals (Pa)

1000 Pascals = 1 Kilopascals (KPa)

Question 11

What is the formula for pressure?

Answer 11

Pressure= Force/ Area

Question 12

What is density?

Answer 12

The measure of the heaviness of a substance.

Question 13

What is the formula for density and what is density measured in?

Answer 13

Density = Mass/ Volume

It is measure in g/ mL

Question 14

If an object has a greater density, then it will …….. when placed in water.

Answer 14

sink

Question 15

What is buoyancy?

Answer 15

When water pushes up on objects placed in it.

Question 16

What provides more buoyancy, salt or fresh water?

Answer 16

Salt water

Question 17

What is the device used to measure the density and therefore their buoyancy called?

Answer 17

Hydrometer

Question 18

What is cohesion?

Answer 18

Attraction between the same type of particle.

Question 19

What is adhesion?

Answer 19

The attraction between different types of particles.

Question 20

What are two things levers are used for?

Answer 20

1) Force magnifiers- you can lift a heavy object using a smaller force.
2) Movement magnifiers- when the effort is moved through a small distance the load is lifted a large distance

Question 21

What are ramps and inclined planes used for?

Answer 21

Makes it easy to lift a heavy load.

Question 22

What are three things gear can do?

Answer 22

1) Change the direction of rotation.
2) Speed magnifier (e.g. a large effort cog turning a small load cog)
3) A force magnifier (a small effort cof turning a large load cog)

Question 23

What are pulleys used for?

Answer 23

To change the direction of a force.