Forces cause changes in the motion of an object. Newton’s Laws help us to understand and analyse those changes. Unbalanced forces cause changes in speed, shape or direction.
What is the speed of a 40 kg girl on a slide if she has 180 J of kinetic energy?
Which of these factors will increase the braking distance of a car?
Being influenced by alcohol
Which word describes the forces on an object moving at a constant speed?
If a resultant force acts on an object, what happens to its motion?
There is no change in speed
The object accelerates in the opposite direction to resultant force
The object accelerates in the same direction as resultant force
Which of these statements about Newton's Third Law of motion is correct?
The forces are always contact forces
The forces act on the same object
The forces between two objects are equal and opposite
Why might an air track be used in the acceleration experiments?
To reduce friction
To ensure the glider travels in a straight line
To be able to attach the pulley
Which of these is not a hazard in the acceleration experiments?
Burns from hot apparatus
Electrical fault with the equipment
Masses falling to the floor
What is the relationship between acceleration and force?
Acceleration is directly proportional to force
Acceleration is inversely proportional to force
Acceleration is not proportional to force
What momentum does a 1,000 kg car moving at 15 m/s have? - Higher
66.7 kg m/s
15,000 kg m/s
0.015 kg m/s
What is the inertial mass of an object that accelerates at 6 m/s2 when pushed by a force of 100 N? - Higher