Grade 7 Science SA 1 (Criterion A)

What is the velocity of a rocket that goes 700 km north in 25 seconds?

[2 marks]

How much time does it take for a bird flying at a speed of 45 kilometers per hour to travel a distance of 1,800 kilometers?

[2 marks]

A driver starts his parked car and within 5 seconds reaches a speed of 60 km/h, as he travels east. What is his acceleration?

[2 marks]

A cyclist accelerates from 0 m/s to 8 m/s in 3 seconds. What is his acceleration ? Is this acceleration higher than that of a car which accelerates from 0 to 30 m/s in 8 seconds?

[2 marks]

If a Ferrari, with an initial velocity of 10 m/s, accelerates at a rate of 50 m/s/s for 3 seconds, what will its final velocity be?

[2 marks]

True or False:

Your mass would be the same on the Moon as it is on the Earth. Explain your answer in complete sentences.

[2 marks]

Label the following image/description below as being examples of 1st, 2nd, or 3rd law.

Then EXPLAIN your answer!

[2 marks]

If a 60 kg person on a 15 kg sled is pushed with a force of 300 N, what will be person’s acceleration?

[2 marks]

Answer the question as per the instruction given in the picture below.

[2 marks]

How are gravity and weight related?

[2 marks]

Name the forces: [3 marks]

i) A force which pulls you down………………………………………..

ii) This force helps to hold things on fridge doors………………………………..

iii) This force rubs things away……………………..

iv) This force helps a ship float……………………………….

v) This type of force needs to touch something to affect it……………………..

vi) A force that slows down things moving through air………………………………….

Fill in the blanks. [Choose from the given words: heat, reduces, motion, less, nature]

[2 marks]

(a) Friction opposes the ________between the surfaces in contact with each other.

(b) Friction depends on the _________of surfaces.

(c) Friction produces _________.

(d) Sprinkling of powder on the carom board ________friction.

(e) Sliding friction is ________than the static friction.