{"id":24,"date":"2014-10-12T08:18:18","date_gmt":"2014-10-12T08:18:18","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu1hwrk\/?page_id=24"},"modified":"2019-10-29T09:31:18","modified_gmt":"2019-10-29T09:31:18","slug":"dynamics-space-exercise-6","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu1hwrk\/dynamics-space-exercise-6\/","title":{"rendered":"Dynamics & Space Exercise 6"},"content":{"rendered":"

1. Find the unbalanced force required to accelerate a 6kg mass at 3ms-2<\/sup>.<\/p>\n

2. Find the acceleration of a 200kg rock, rolling down a hill, if the unbalanced force acting on it is 1kN.<\/p>\n

3. What is the mass of a trolley if an unbalanced force of 12N causes it to accelerate at 4ms-2<\/sup>?<\/p>\n

4. The forces acting on a car of mass 1000kg are shown below.<\/p>\n

\"\"<\/a><\/p>\n

(a) Find the unbalanced force acting on the car.<\/p>\n

(b) Calculate the acceleration of the car.<\/p>\n

5. A model motor boat of mass 4 kg is initially at rest on a pond. The boat’s motor, which provides a constant force of 5 N, is switched on. As the boat accelerates, the force of friction acting on it increases. A graph of the force of friction acting on the boat against time is shown.<\/p>\n

\"\"<\/a><\/p>\n

 <\/p>\n

(a)<\/p>\n

(i) State the force of friction acting on the boat 2 s after the motor is switched on.<\/p>\n

(ii) Calculate the acceleration of the boat at this time.<\/p>\n

(iii) Describe and explain the movement of the boat after 7 s.<\/p>\n

 <\/p>\n

6. Stephen and Jack are invited along to \u2018Techno toys\u2019 workshop to try out a new remote control car. They line the car up to race along the 200 m track and then start it off.<\/p>\n

\"\"<\/a><\/p>\n

(a) Describe how the designers could work out the car\u2019s instantaneous speed as it goes round the corner of the track. Your answer must include:<\/p>\n

– any apparatus they would need
\n– any measurements they would take
\n– any calculations they would do.<\/p>\n

 <\/p>\n

The speed time graph below represents the motion of the car during part of the race.<\/p>\n

\"\"<\/a><\/p>\n

(b) Calculate the acceleration of the car during the first 6 seconds.<\/p>\n

(c) How far did the car travel during the 18 seconds represented by the graph.<\/p>\n

(d) During the period 6 s to 14 s the car exerted an engine force of 450 N. What size are the frictional forces acting on the car at this time.<\/p>\n

(e) How could the designers reduce the frictional forces acting on the car.<\/p>\n

(f) Draw the graph that would have been produced if the race had taken place on a wet day.<\/p>\n","protected":false},"excerpt":{"rendered":"

1. Find the unbalanced force required to accelerate a 6kg mass at 3ms-2. 2. Find the acceleration of a 200kg rock, rolling down a hill, if the unbalanced force acting on it is 1kN. 3. What is the mass of a trolley if an unbalanced force of 12N causes it to accelerate at 4ms-2? 4. … Continue reading Dynamics & Space Exercise 6<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":2454,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-24","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu1hwrk\/wp-json\/wp\/v2\/pages\/24","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu1hwrk\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu1hwrk\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu1hwrk\/wp-json\/wp\/v2\/users\/2454"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu1hwrk\/wp-json\/wp\/v2\/comments?post=24"}],"version-history":[{"count":7,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu1hwrk\/wp-json\/wp\/v2\/pages\/24\/revisions"}],"predecessor-version":[{"id":183,"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu1hwrk\/wp-json\/wp\/v2\/pages\/24\/revisions\/183"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/gc\/hyndsecphysu1hwrk\/wp-json\/wp\/v2\/media?parent=24"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}