Forces Year 7

Forces

100

a push, pull or twist is a type of what force

What is a contact force?

200

gravity and magnetism is a type of what force 

What is a non-contact force?

300

another name for a twist or turning force

What is torque?

400

an arrow with direction and magnitude

What is a vector?

500

Netwon's 2nd law

What is F=m x a?

Friction

100

two objects rubbing against each other create heat.  This is called __________

What is friction?

200

the name for the number that explains how much friction between two objects

What is the coefficient of friction?

300

If u = f divide w find the u for a force of 40N and a weight of 80N

What is 0.5?

400

air resistance and water resistance are a type of what friction

What is fluid friction?

500

explain why a smooth round object will reach the ground before a large bulky object

What is streamlined?

Buoyancy and density

100

the name for the reason an object floats

What is buoyancy?

200

p=m divide v is the formula for ___________

What is density?

300

Calculate the density of an object that has a mass of 100g and a volume of 15cm³

6.67g/cm³

400

Calculate the density of an object that has a mass of 750g and a volume of 140cm³

5.36g/cm³

500

Calculate the density of an object that has a mass of 36g and a volume of 48cm³ and determine if the object will sink or float

0.75g/cm³ and the object will float

Magnetism and Electrostatic

100

The north and south poles will attract or repel each other

attract

200

the name of the 3 ferromagnetic metals are:

cobalt, nickel and iron

300

The magnetic south pole can be found in which location?

The North Pole

400

Electrons can be found where on an atom

on the shell

500

The neutrons are found in the nucleus.  What is the charge?

neutral

Force Problems

100

• Calculate how much acceleration an object with a mass of 5 kg will experience when a force of 21 N acts upon it.

4.2m/s²

200

Draw an aeroplane with 4 vectors and write a word on each arrow describing the force

Up arrow - Lift

Down arrow - Weight

Forward arrow - thrust

Backward arrow - drag

300

• Calculate the torque produced when a perpendicular Force of 20 N is applied 3m from the pivot point.

60Nm

400

• Which of the following objects experiences the largest force?

Object A   6.5 kg accelerating at 3.2 m/s2

Object B   2.8 kg accelerating at 7.4 m/s2

Object A

500

Calculate the friction coefficient between two surfaces if the force is 24N and the weight 125N.  Your answer must be to two decimal places

0.19