Daily Practice - GCSE Science
28th January 1999
- 1Forces
A resultant force of 45 N acts on an object of mass 9.0 kg. Calculate its acceleration. Use F = m x a.
- 2Motion: Speed, Velocity and Acceleration
A runner completes a 400 m race in 52 s. Calculate her average speed, giving your answer to 3 significant figures.
- 3Forces, Newton's Laws and Momentum
Explain, using Newton's Third Law, why a swimmer is able to push themselves forward by pushing backward against the water.
- 4Pressure, Moments and Levers
A box of weight 120 N has a base area of 0.40 m^2. Calculate the pressure it exerts on the ground.
- 5Waves
Explain why ultraviolet radiation can be harmful to human skin.
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