s2 forces

The 3 ways we can apply a force are

• push, pull, turn

• push, pull, twist

• open, close, twist

• push, twist, spin

We cannot see forces

• True

• False

The piece of equipment used to measure forces is a

Match the effect of the force to its name

• Air Resistance

• Placing iron nails near a magnet will stick to the magnet

• Magnetic

• A ball floating on water

• Friction

• Stops our feet from slipping on the ground

• Gravity

• A ball thrown in the air will land back on the ground

• Buoyancy

• Opening a parachute slows a skydiver down as they land

Which of the following best describes MASS?

• Mass is how big something is.

• Mass is how heavy something is.

• Mass is how much of something there is.

• Mass is the force of gravity acting on an object.

Which of the following best describes WEIGHT?

• Weight is the force of gravity acting on an object.

• Weight is how much of something there is.

• Weight is how heavy something is.

• Weight is the force of friction acting on an object.

The mass of an object on Earth is 50kg. The gravitational field strength on Earth is 10N/kg.

Calculate the weight of the object.

Answer explanation

Weight = mass x gravitational field strength.

Weight = 50 x 10 = 500 NEWTONS.

The mass of an object is 15kg. The gravitational field strength on Jupiter is 2.5 N/kg.

Calculate the weight of the object.

Answer explanation

weight = mass x gravitational field strength.

weight = 15 x 2.5 = 37.5 NEWTONS

The weight of an object on Earth is 60 Newtons. The gravitational field strength on Earth is 10 N/kg.

Calculate the mass of the object.

Answer explanation

if weight = mass x g ( mass x 10)

to work out the mass we take the weight and divide by 10,

60/10 = 6KG

Which of the following is an example of friction that is helpful?

• Brakes used on a bike

• Engine parts rubbing together

• Air slowing down a race car