Lesson 1: Laws of Physics
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GRAVITY: Jenny presses down on earth with a weight force of 600 N . The gravitational field strength on earth is 10 N/kg. Remember the equation for weight force from the lesson.
LAW:  Weight force = mass x gravitational field strength
What is jenny's mass (in kg)? *
1 point
How much would she weigh on mercury, where the gravitational field is 4 N/kg? (in N) *
1 point
Who would weigh more: Lucy (50 kg) standing on Saturn (gravitational field strength = 9 N/kg) or Julian (80 kg) standing on Mars (gravitational field strength = 4 N/kg)? 1. Lucy, 2. Julian, 3. The same *
2 points
Which of these does NOT contribute to gravity? *
1 point
Required
MOTION LAWS: Isaac Newton 'discovered' gravity when he realised that everything falls to earth at the same rate.
What is the scientific term for this rate of falling? *
1 point
If a force of 10N acts on a ball weighing 5 kg, what will its acceleration be? *
Force = mass * acceleration
1 point
If the ball splits in half, what will the new acceleration be for each piece (2.5 kg)? *
Force = mass * acceleration
1 point
Explain in your own words these ideas: Gravity, force, acceleration.
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