Physics year 7 POST TEST

Circle the one correct answer for each of the following questions

1. A force is a...

 

• push or pull

• push, pull, or twist

• movement

• change in position

2. Which of the following examples shows the action of an unbalanced force?

•  a) A car that is travelling at 60km/h for 20 minutes

•  b) A person that is jogging on a treadmill at a speed of 6 km/h for 30 minutes

•  c) A cyclist slowing down as they approach an intersection

•  d) A person sitting on a chair

3. Which of the following statements explains why the roads become slippery when it is raining, resulting in the increased risk of skidding and collisions?

•  a) The water on the road causes more friction, meaning, the car's tyres are not able to  grip the road as effectively.

•  b) The water on the road causes more friction, meaning, the car's tyres can

   grip the road more effectively.

• c) The water on the road causes less friction, meaning, the car's tyres can

   grip the road more effectively.

• d) The water on the road causes less friction, meaning, the car's tyres can

   grip the road less effectively.

4. Which of the following everyday objects is an example of a lever?

•  a) a pair of scissors

•  b) a slide

•  c) the wheels of a bicycle

•  d) an axe for chopping wood

5. Which of the following is not a way that simple machines make tasks easier?

• a) They reduce the size of the force needed.

•  b) They make things speed up.

•  c) They change the direction of the force.

•  d) They reduce the mass of the load

6. Which statement describes the relationship between the load, fulcrum, and effort of a lever?

•  a) As the distance between the load and the fulcrum increases, the effort required to lift the load decreases.

• b) As the distance between the load and the fulcrum increases, the effort required to lift the load increases.

• c) As the distance between the load and the fulcrum increases, the mass of the load increases.

• d) As the distance between the load and the fulcrum increases, the mass of the load decreases.

7. Decide whether the statements below are true or false. Circle the correct answer for each one.

a) A force is a type of motion

• a) True

• b) False

b) A force can cause an object to change direction

• a) True

• b) False

c) Only one force can act on an object at a time

• a) True

• b) False

d) A force can change the shape of something

• a) True

• b) False