P4 - Explaining Motion

What two words together mean 'two forces that arise from the same interaction'.

Two properties of an interaction pair always remain the same. What are they?

What is the name for the force that arises from two objects touching?

What is action-at-a-distance? Give two examples.

What are the two properties of action-at-a-distance forces that are different from contact forces?

How do objects, such as cars, get moving?

If a car is stuck on ice it doesn't move. Why is this?

What causes friction?

What two things does the amount of friction depend on?

What is the sum of all objects acting on an object called?

What is 'the force exerted by a hard surface on an object that presses on it'?

Describe the phases that occur when a ball is dropped in freefall. (3 phases)

What 4 factors affect air resistance?

What is the difference between distance and displacement?

What two words mean 'the speed of an object at a given moment' and how is this worked out?

In a distance-time graph, what does a slope, a curve and a horizontal line mean?

When is it possible to draw a displacement-time graph?

What makes a displacement-time graph and a distance-time graph different?

What does a slope, a curve and a horizontal line mean on a speed-time graph?

How does a velocity-time graph show when an object begins travelling in the opposite direction?

What does a force acting upon an object cause?

What's the equation that works out momentum?

Why do crumple zones on cars work?

Aside from crumple zones, name two other safety features used in cars and motorcycles.

If a resultant force on an object is 0N, what happens to the object?

What is the force pushing an object forwards called?

What are forces such as air resistance and friction called?

What is the energy of a moving object called?

What's the equation that explains how work done by a force is calculated?

When an object is moved vertically upwards, what does it gain?

What's the equation for GPE, with units?

What's the equation for kinetic energy, with units?

What is the idea that 'energy is never used up, just passed on to another object' called?

What happens when gravitational energy decreases?