Forces @ Work
What type of force slows down a rolling soccer ball on grass?
What is friction?
Which situation shows work being done: holding a box, or lifting a box upward?
What is lifting the box upward?
Which simple machine helps lift objects by spreading force over a distance, like a ramp?
What is an inclined plane?
On a distance–time graph, what does a straight line with a constant slope show?
What is constant speed?
A skateboarder at the top of a ramp is not moving. What type of energy does the skateboarder have the most of at this point?
What is the gravitational potential energy?
Two students push a box with equal force in opposite directions, and it does not move. What type of forces are acting on the box?
What is balanced forces?
Why does pushing against a wall without moving it not count as work?
What is because there is no distance moved?
Which simple machine changes the direction of force when lifting a flag?
What is a pulley?
Which type of graph best shows whether an object is speeding up or slowing down?
What is a speed-time graph?
This type of energy is the energy an object has because it is moving, like a rolling skateboard or a flying baseball.
What is kinetic energy?
A car is moving at a constant speed in a straight line. What can you say about the net force acting on the car?
What is the net force is zero?
When a moving bowling ball hits pins and knocks them over, what happens to the energy?
What is energy is transferred from the ball to the pins?
A jar lid being twisted open is an example of which simple machine?
What is a screw?
If the slope of a distance–time graph becomes steeper, what is happening to the object’s speed?
What is the speed is increasing?
Two carts have the same speed, but one has more mass. Which cart has more kinetic energy?
What is the cart with more mass?
Why does a heavier storm shelter door require more force to open than a regular door?
What is because it has more mass?
What two things must happen for work to be done on an object?
What is a force must be applied and the object must move?
A knife blade works by concentrating force onto a small area. What simple machine is this?
What is a wedge?
An object’s distance does not change over time on a graph. What does this indicate?
What is the object is at rest?
A falling object loses height but gains speed. What is happening to its potential and kinetic energy?
What is potential energy decreases while kinetic energy increases?
If the distance between an object and a reference point does not change over time, what can be concluded about its motion?
What is the object is not moving?
A moving object stops after hitting another object. Where did its energy go?
What is it was transferred to other objects and forms of energy?
A student uses a crowbar to lift a heavy rock. The rock is close to the fulcrum, and the student applies force far from the fulcrum. What type of simple machine is being used?
What is a lever?
Three objects travel different paths on a distance–time graph. How can you tell which has the greatest speed?
What is the one with the steepest slope?
A ball is thrown straight upward and then caught at the same height. Ignoring air resistance, what happens to the total energy?
What is it remains constant?