Electricity
Give a difference between conductors and insulators
conductors allow the flow of electric current whereas insulators don't.
Name the force responsible for keeping objects on Earth's surface.
weight
Give two different examples of a body that is in equilibrium.
1) An object at rest.
2) An object moving with a constant speed.
Speed is determined based on two factors. What are they?
distance and time
Batteries convert _____ energy into ______ energy.
chemical, electric
Which force allows you to pick up an object with your hand?
Traction
If an object is in equilibrium, what can you conclude about the net force acting on it?
The net force is zero.
If an object covers a distance of 100 meters in 20 seconds, what is its speed in km/hr?
18km/hr
It is the flow of electrons.
Which force opposes the motion of objects sliding against each other?
friction
A box, of mass 800g, rests on a table.
Determine the magnitude of the normal reaction force acting on the box.
8N
If an object is moving at a constant speed, what is its nature of motion?
URM
In a series circuit, what happens to the brightness of bulbs when more bulbs are added?
a) They get brighter b) They stay the same brightness c) They get dimmer d) It depends on the voltage
They get dimmer
Name the force exerted by a charged body on another.
Electric force
You are pulling a sled with a force of 30N to the right, but it doesn't move. What can you conclude about the force of friction?
The force of friction acting to the left is greater than or equal to 30N.
A cyclist travels 120 kilometers north in 2 hours and then 60 kilometers south in 1 hour. What is the cyclist's average velocity for the entire trip?
60km/hr
What type of circuit is commonly used in homes to provide electricity to appliances and lighting?
a) Series circuit b) Parallel circuit
c) Complex circuit d) Closed circuit
Parallel circuit
List four effects of a force.
1) Changes the shape of a body
2) Sets a body in motion
3) Stops the motion of a body
4) Changes the speed and direction of a moving body
What happens to the motion of an object when the net force acting on it is zero?
The object moves with a constant speed.
What does acceleration mean?
change in speed or/and direction