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Edexcel GCSE

FORCES

(Speed, Acceleration, Forces, Weight, Graphs)

page 1

Choose the correct units for the following measurements :  
1. Mass
2. Weight
3. Velocity
4. Friction

The following questions are about a parachute jump.

 

A skydiver jumps out of a plane. Gravity pulls the person downwards. Air resistance pushes upwards. Later on they open the parachute.

They are shown here at the bottom of the jump.

 

Choose the sentences that best describe what happens:

  

5. Just after jumping out and before the parachute has been opened...

  • A). The air resistance decreases
  • B). The force of gravity increases as the person accelerates
  • C). The upward force increases
  • D). The 2 forces are always balanced

6. After a while the jumper reaches terminal velocity. This happens when

  • A). the air resistance and the force of gravity are balanced
  • B). the force of gravity increases more than the air resistance
  • C). air resistance is the largest force
  • D). the person is accelerating at a constant rate.

7. Which of these graphs shows the motion up to this point?

8. The person now opens his parachute. What happens now?

  • A). the air resistance and the force of gravity are balanced
  • B). the force of gravity decreases
  • C). the resultant force is now upwards
  • D). the person moves upwards as air resistance increases

9. A motor bike is travelling along a main road. If the forward force is 1kN and the backwards force bike is 500N , the resultant force on the bike is

  • A). 501N
  • B). 499N
  • C). 1500N
  • D). 500N

10. At one point in the journey, the bike is travelling at 20 m/s, the forward force is 500N and the backward force is 800N. The bike will now

  • A). accelerate
  • B). decelerate
  • C). stay at a constant speed
  • D). move backwards

11. Which of the following are vector quantities?

  • A). mass and velocity
  • B). acceleration and force
  • C). mass and displacement
  • D). velocity and time

12. A train accelerates from 10 m/s to 50 m/s in 20 seconds. The acceleration is:

  • A). 2 m/s2
  • B). 2.5 m/s2
  • C). 800 m/s2
  • D). 1000 m/s2
a = (v-u)
t

In a formula 1 car race the acceleration of the first few cars was measured. What are the missing values?
Car
Starting velocity (m/s)
Final velocity (m/s)
Time taken (s)
acceleration (m/s2)
13.
BMW
0
20
5
14.
Ferrari
5
30
5
15.
McClaren
0
12
6
16.
Toyota
60
12
4

 

 

17. If a car accelerates at - 3 m/s2, what does this mean?

  • A). It is moving backwards
  • B). It is slowing down
  • C). It is accelerating but 3 m/s2 less than before
  • D). It is accelerating, but the resultant force is backwards